Lincoln Electric Welder SVM166 A User Manual
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SVM166-A  
April, 2006  
LN-15 WIRE FEEDER  
For use with machines having Code Number : 11033, 11035  
Safety Depends on You  
Lincoln arc welding and cutting  
equipment is designed and built  
with safety in mind. However,  
your overall safety can be  
increased by proper installation  
. . . and thoughtful operation on  
your part. DO NOT INSTALL,  
OPERATE OR REPAIR THIS  
EQUIPMENT WITHOUT READ-  
ING THIS MANUAL AND THE  
SAFETY PRECAUTIONS CON-  
TAINED THROUGHOUT. And,  
most importantly, think before  
you act and be careful.  
SERVICE MANUAL  
Copyright © 2006 Lincoln Global Inc.  
• World's Leader in Welding and Cutting Products •  
• Sales and Service through Subsidiaries and Distributors Worldwide •  
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com  
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ii  
SAFETY  
ARC RAYS can burn.  
ELECTRIC SHOCK can kill.  
3.a. The electrode and work (or ground) circuits  
are electrically “hot” when the welder is on.  
Do not touch these “hot” parts with your bare  
skin or wet clothing. Wear dry, hole-free  
gloves to insulate hands.  
4.a. Use a shield with the proper filter and cover  
plates to protect your eyes from sparks and  
the rays of the arc when welding or observing  
open arc welding. Headshield and filter lens  
should conform to ANSI Z87. I standards.  
4.b. Use suitable clothing made from durable flame-resistant  
material to protect your skin and that of your helpers from  
the arc rays.  
3.b. Insulate yourself from work and ground using dry insulation.  
Make certain the insulation is large enough to cover your full  
area of physical contact with work and ground.  
4.c. Protect other nearby personnel with suitable, non-flammable  
screening and/or warn them not to watch the arc nor expose  
themselves to the arc rays or to hot spatter or metal.  
In addition to the normal safety precautions, if welding  
must be performed under electrically hazardous  
conditions (in damp locations or while wearing wet  
clothing; on metal structures such as floors, gratings or  
scaffolds; when in cramped positions such as sitting,  
kneeling or lying, if there is a high risk of unavoidable or  
accidental contact with the workpiece or ground) use  
the following equipment:  
FUMES AND GASES  
can be dangerous.  
5.a. Welding may produce fumes and gases  
hazardous to health. Avoid breathing these  
• Semiautomatic DC Constant Voltage (Wire) Welder.  
• DC Manual (Stick) Welder.  
• AC Welder with Reduced Voltage Control.  
fumes and gases.When welding, keep  
your head out of the fume. Use enough  
ventilation and/or exhaust at the arc to keep  
3.c. In semiautomatic or automatic wire welding, the electrode,  
electrode reel, welding head, nozzle or semiautomatic  
welding gun are also electrically “hot”.  
fumes and gases away from the breathing zone. When  
welding with electrodes which require special  
ventilation such as stainless or hard facing (see  
instructions on container or MSDS) or on lead or  
cadmium plated steel and other metals or coatings  
which produce highly toxic fumes, keep exposure as  
low as possible and below Threshold Limit Values (TLV)  
using local exhaust or mechanical ventilation. In  
confined spaces or in some circumstances, outdoors, a  
respirator may be required. Additional precautions are  
also required when welding on galvanized steel.  
3.d. Always be sure the work cable makes a good electrical  
connection with the metal being welded. The connection  
should be as close as possible to the area being welded.  
3.e. Ground the work or metal to be welded to a good electrical  
(earth) ground.  
3.f. Maintain the electrode holder, work clamp, welding cable and  
welding machine in good, safe operating condition. Replace  
damaged insulation.  
5.b. Do not weld in locations near chlorinated hydrocarbon vapors  
coming from degreasing, cleaning or spraying operations.  
The heat and rays of the arc can react with solvent vapors to  
form phosgene, a highly toxic gas, and other irritating prod-  
ucts.  
3.g. Never dip the electrode in water for cooling.  
3.h. Never simultaneously touch electrically “hot” parts of  
electrode holders connected to two welders because voltage  
between the two can be the total of the open circuit voltage  
of both welders.  
5.c. Shielding gases used for arc welding can displace air and  
cause injury or death. Always use enough ventilation,  
especially in confined areas, to insure breathing air is safe.  
3.i. When working above floor level, use a safety belt to protect  
yourself from a fall should you get a shock.  
5.d. Read and understand the manufacturer’s instructions for this  
equipment and the consumables to be used, including the  
material safety data sheet (MSDS) and follow your  
employer’s safety practices. MSDS forms are available from  
your welding distributor or from the manufacturer.  
3.j. Also see Items 6.c. and 8.  
5.e. Also see item 1.b.  
Mar ‘95  
LN-15  
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iii  
SAFETY  
WELDING SPARKS can  
cause fire or explosion.  
CYLINDER may explode  
if damaged.  
6.a. Remove fire hazards from the welding area.  
If this is not possible, cover them to prevent  
7.a. Use only compressed gas cylinders  
containing the correct shielding gas for the  
the welding sparks from starting a fire.  
Remember that welding sparks and hot  
materials from welding can easily go through small cracks  
and openings to adjacent areas. Avoid welding near  
hydraulic lines. Have a fire extinguisher readily available.  
process used and properly operating  
regulators designed for the gas and  
pressure used. All hoses, fittings, etc. should be suitable for  
the application and maintained in good condition.  
7.b. Always keep cylinders in an upright position securely  
chained to an undercarriage or fixed support.  
6.b. Where compressed gases are to be used at the job site,  
special precautions should be used to prevent hazardous  
situations. Refer to “Safety in Welding and Cutting” (ANSI  
Standard Z49.1) and the operating information for the  
equipment being used.  
7.c. Cylinders should be located:  
•Away from areas where they may be struck or subjected to  
physical damage.  
6.c. When not welding, make certain no part of the electrode  
circuit is touching the work or ground. Accidental contact can  
cause overheating and create a fire hazard.  
•A safe distance from arc welding or cutting operations and  
any other source of heat, sparks, or flame.  
7.d. Never allow the electrode, electrode holder or any other  
electrically “hot” parts to touch a cylinder.  
6.d. Do not heat, cut or weld tanks, drums or containers until the  
proper steps have been taken to insure that such procedures  
will not cause flammable or toxic vapors from substances  
inside. They can cause an explosion even though they have  
been “cleaned”. For information, purchase “Recommended  
Safe Practices for the Preparation for Welding and Cutting of  
Containers and Piping That Have Held Hazardous  
Substances”, AWS F4.1 from the American Welding Society  
(see address above).  
7.e. Keep your head and face away from the cylinder valve outlet  
when opening the cylinder valve.  
7.f. Valve protection caps should always be in place and hand  
tight except when the cylinder is in use or connected for  
use.  
7.g. Read and follow the instructions on compressed gas  
cylinders, associated equipment, and CGA publication P-l,  
“Precautions for Safe Handling of Compressed Gases in  
Cylinders,” available from the Compressed Gas Association  
1235 Jefferson Davis Highway, Arlington, VA 22202.  
6.e. Vent hollow castings or containers before heating, cutting or  
welding. They may explode.  
6.f. Sparks and spatter are thrown from the welding arc. Wear oil  
free protective garments such as leather gloves, heavy shirt,  
cuffless trousers, high shoes and a cap over your hair. Wear  
ear plugs when welding out of position or in confined places.  
Always wear safety glasses with side shields when in a  
welding area.  
FOR ELECTRICALLY  
powered equipment.  
6.g. Connect the work cable to the work as close to the welding  
area as practical. Work cables connected to the building  
framework or other locations away from the welding area  
increase the possibility of the welding current passing  
through lifting chains, crane cables or other alternate circuits.  
This can create fire hazards or overheat lifting chains or  
cables until they fail.  
8.a. Turn off input power using the disconnect  
switch at the fuse box before working on  
the equipment.  
8.b. Install equipment in accordance with the U.S. National  
Electrical Code, all local codes and the manufacturer’s  
recommendations.  
6.h. Also see item 1.c.  
8.c. Ground the equipment in accordance with the U.S. National  
Electrical Code and the manufacturer’s recommendations.  
Mar ‘95  
LN-15  
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iv  
SAFETY  
zones où l’on pique le laitier.  
PRÉCAUTIONS DE SÛRETÉ  
6. Eloigner les matériaux inflammables ou les recouvrir afin de  
prévenir tout risque d’incendie dû aux étincelles.  
Pour votre propre protection lire et observer toutes les instructions  
et les précautions de sûreté specifiques qui parraissent dans ce  
manuel aussi bien que les précautions de sûreté générales suiv-  
antes:  
7. Quand on ne soude pas, poser la pince à une endroit isolé de  
la masse. Un court-circuit accidental peut provoquer un  
échauffement et un risque d’incendie.  
Sûreté Pour Soudage A L’Arc  
1. Protegez-vous contre la secousse électrique:  
8. S’assurer que la masse est connectée le plus prés possible de  
la zone de travail qu’il est pratique de le faire. Si on place la  
masse sur la charpente de la construction ou d’autres endroits  
éloignés de la zone de travail, on augmente le risque de voir  
passer le courant de soudage par les chaines de levage,  
câbles de grue, ou autres circuits. Cela peut provoquer des  
risques d’incendie ou d’echauffement des chaines et des  
câbles jusqu’à ce qu’ils se rompent.  
a. Les circuits à l’électrode et à la piéce sont sous tension  
quand la machine à souder est en marche. Eviter toujours  
tout contact entre les parties sous tension et la peau nue  
ou les vétements mouillés. Porter des gants secs et sans  
trous pour isoler les mains.  
b. Faire trés attention de bien s’isoler de la masse quand on  
soude dans des endroits humides, ou sur un plancher met-  
allique ou des grilles metalliques, principalement dans  
les positions assis ou couché pour lesquelles une grande  
partie du corps peut être en contact avec la masse.  
c. Maintenir le porte-électrode, la pince de masse, le câble de  
soudage et la machine à souder en bon et sûr état defonc-  
tionnement.  
9. Assurer une ventilation suffisante dans la zone de soudage.  
Ceci est particuliérement important pour le soudage de tôles  
galvanisées plombées, ou cadmiées ou tout autre métal qui  
produit des fumeés toxiques.  
10. Ne pas souder en présence de vapeurs de chlore provenant  
d’opérations de dégraissage, nettoyage ou pistolage. La  
chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs  
du solvant pour produire du phosgéne (gas fortement toxique)  
ou autres produits irritants.  
d.Ne jamais plonger le porte-électrode dans l’eau pour le  
refroidir.  
e. Ne jamais toucher simultanément les parties sous tension  
des porte-électrodes connectés à deux machines à souder  
parce que la tension entre les deux pinces peut être le total  
de la tension à vide des deux machines.  
11. Pour obtenir de plus amples renseignements sur la sûreté, voir  
le code “Code for safety in welding and cutting” CSA Standard  
W 117.2-1974.  
f. Si on utilise la machine à souder comme une source de  
courant pour soudage semi-automatique, ces precautions  
pour le porte-électrode s’applicuent aussi au pistolet de  
soudage.  
2. Dans le cas de travail au dessus du niveau du sol, se protéger  
contre les chutes dans le cas ou on recoit un choc. Ne jamais  
enrouler le câble-électrode autour de n’importe quelle partie du  
corps.  
PRÉCAUTIONS DE SÛRETÉ POUR  
LES MACHINES À SOUDER À  
TRANSFORMATEUR ET À  
REDRESSEUR  
3. Un coup d’arc peut être plus sévère qu’un coup de soliel, donc:  
a. Utiliser un bon masque avec un verre filtrant approprié ainsi  
qu’un verre blanc afin de se protéger les yeux du rayon-  
nement de l’arc et des projections quand on soude ou  
quand on regarde l’arc.  
1. Relier à la terre le chassis du poste conformement au code de  
l’électricité et aux recommendations du fabricant. Le dispositif  
de montage ou la piece à souder doit être branché à une  
bonne mise à la terre.  
b. Porter des vêtements convenables afin de protéger la peau  
de soudeur et des aides contre le rayonnement de l‘arc.  
c. Protéger l’autre personnel travaillant à proximité au  
soudage à l’aide d’écrans appropriés et non-inflammables.  
2. Autant que possible, I’installation et l’entretien du poste seront  
effectués par un électricien qualifié.  
4. Des gouttes de laitier en fusion sont émises de l’arc de  
soudage. Se protéger avec des vêtements de protection libres  
de l’huile, tels que les gants en cuir, chemise épaisse, pan-  
talons sans revers, et chaussures montantes.  
3. Avant de faires des travaux à l’interieur de poste, la debranch-  
er à l’interrupteur à la boite de fusibles.  
4. Garder tous les couvercles et dispositifs de sûreté à leur place.  
5. Toujours porter des lunettes de sécurité dans la zone de  
soudage. Utiliser des lunettes avec écrans lateraux dans les  
LN-15  
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RETURN TO MAIN MENU  
MASTER TABLE OF CONTENTS FOR ALL SECTIONS  
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
i-iv  
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section A  
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section B  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section C  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section D  
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section E  
Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F  
Electrical Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section G  
Parts Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P482 Series  
LN-15  
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Section A-1  
Section A-1  
TABLE OF CONTENTS  
- INSTALLATION SECTION -  
Installation ..............................................................................................................Section A  
Technical Specifications...............................................................................................A-2  
Safety Precautions .......................................................................................................A-3  
High Frequency Protection ..........................................................................................A-3  
Connections .................................................................................................................A-4  
Gun & Cable Assembly ................................................................................................A-6  
Feeding Wire Electrode................................................................................................A-7  
LN-15  
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A-2  
A-2  
INSTALLATION  
TECHNICAL SPECIFICATIONS – LN-15 (K1870-1), (K1870-2 CE)  
INPUT VOLTAGE  
15-110 VDC (5 Amps Maximum)  
Across the Arc Model  
RATED CURRENT  
300 Amps 60% Duty Cycle  
250 Amps 100% Duty Cycle  
ELECTRODE DIAMETERS and SPEED RANGE  
Electrode Size Speed Range  
0.023 - 0.052" 50 - 700 in/min  
(0.6 - 1.3 mm) (1.3 - 17.8 m/min)  
Solid Electrode  
Steel  
0.0345 - 5/64" 50 - 400 in/min  
(0.9 - 2.3 mm) (1.3 - 10.1 m/min)  
Flux Cored  
Electrode  
PHYSICAL DIMENSIONS  
HEIGHT  
WIDTH  
DEPTH  
WEIGHT  
SPOOL SIZE CAPABILITY  
8 (200mm) Dia. x 4 (100mm)  
Wide Spools including  
AWS 8 DIA. (10-15lbs)  
JIS S-3 200mm max. (5 - 7 kg)  
DIN 200 (5 kg)  
12.7 Inches  
(323 mm)  
8.7 Inches  
(221mm)  
23 Inches  
(584 mm)  
30lbs  
(14kg)  
TEMPERATURE RANGE  
OPERATION:  
STORAGE:  
- 40o C to +50o C (- 40o F to +104o F)  
- 40o C to +70o C (- 40o F to +185o F)  
LN-15  
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A-3  
A-3  
INSTALLATION  
SAFETY PRECAUTIONS  
The work clip lead attached to the front of the LN-  
15 must be connected directly to the work using the  
spring clip on the end of the lead.  
WARNING  
If the work clip lead is not connected, the LN-15 will not  
operate.  
ELECTRIC SHOCK CAN KILL.  
• ONLY QUALIFIED PERSONNEL  
SHOULD PERFORM THIS  
INSTALLATION.  
The work clip lead also serves as a work sensing lead  
for the LN-15. If the work clip lead is extended by the  
user beyond the standard 15' (4.6m) length, the volt-  
meter reading will be lower than the actual arc volts  
due to resistance in the extended lead. To minimize the  
error, the following lead size is recommended for the  
maximum extended lengths shown.  
• Turn off input power to the power  
source at the disconnect switch  
or fuse box before working on  
this equipment. Turn off the input power to any  
other equipment connected to the welding  
system at the disconnect switch or fuse box  
before working on the equipment.  
AWG  
#14  
#12  
#10  
#6  
Max. Length  
25 ft (7.6m)  
50 ft (15.2m)  
100 ft (30.5m)  
200 ft (61.0m)  
• Do not touch electrically hot parts.  
• Do not touch metal portions of the LN-15 work  
lead clip when the welding power source is.  
• Do not connect the LN-15 to a non-Lincoln TIG  
power source, a SQUARE WAVE TIG power  
source, or a PLASMA CUTTING power source.  
-------------------------------------------------------------------  
LOCATION  
The LN-15 should be positioned upright on a  
horizontal surface. Do not submerge the LN-15 in  
water. The best practice is to keep the wire feeder in  
a dry environment. When working outdoors in severe  
wet weather, place the LN-15 with the door facing up.  
CORRECT WORK CLIP ATTACHED TO WORK  
WORK CLIP LEAD  
WARNING  
ELECTRIC SHOCK CAN KILL.  
• ONLY QUALIFIED PERSONNEL  
SHOULD  
PERFORM  
THIS  
INSTALLATION.  
INCORRECT WORK CLIP ATTACHED TO ROLL CAGE  
HIGH FREQUENCY PROTECTION  
CAUTION  
• Do not touch metal portions of  
the LN-15 work clip lead when  
the welding power source is on. The work clip  
lead is electrically "hot" to work if the input  
electrode cable to the LN-15 is electrically  
"hot", even if the gun trigger is off. Care should  
be taken to only handle the LN-15 work clip  
lead by its nonmetal insulated portions and/or  
the welding power source should be turned off  
before handling the work clip.  
To prevent possible damage to the LN-15, do not  
connect the LN-15 to non-Lincoln TIG or SQUARE  
WAVE power sources. TIG high frequency should  
never be applied to the LN-15.  
------------------------------------------------------------------------------------------  
Locate the LN-15 away from radio controlled machin-  
ery. The normal operation of the LN-15 may adversely  
affect the operation of RF controlled equipment, which  
may result in bodily injury or damage to the equipment  
total.  
• Do not attach the work clip lead to the roll cage  
or bottom skids of the LN-15.  
• Attach the work clip only to the work piece.  
-------------------------------------------------------------------  
** The work clip lead is present only on Across-the-  
Arc models.  
LN-15  
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A-4  
A-4  
INSTALLATION  
WELD CABLE CONNECTIONS  
CAUTION  
WARNING  
To prevent possible damage to the LN-15, do not  
connect the LN-15 to non-Lincoln TIG or square  
wave power sources. TIG high frequency should  
never be applied to the LN-15.  
------------------------------------------------------------------------------------------  
ELECTRIC SHOCK CAN KILL.  
• Only a qualified electrician should  
connect the electrode leads to the  
LN-15. Connections should be  
made in accordance with all local  
and national electrical codes.  
Failure to do so may result in bodi-  
ly injury or death.  
ENGINE DRIVE POWER SOURCE  
CONNECTION  
The LN-15 has an internal contactor and the electrode  
is not energized until the gun trigger is closed. When  
the gun trigger is closed the wire will begin to feed and  
the welding process is started.  
------------------------------------------------------------------------  
The size of the electrode cable and work cable must be  
sufficient for the maximum weld current and total cable  
length used.  
1. Shut the welder off.  
To avoid interference problems with other equipment  
and to achieve the best possible operation, route all  
cables directly to the work or wire feeder. Avoid exces-  
sive lengths and do not coil excess cable. Be sure the  
connection to the work makes tight metal-to-metal  
electrical contact. (See Table A.1)  
2. For electrode Positive polarity welding, connect the  
electrode cable to the "+" terminal of the welder and  
work cable to the "-" terminal of the welder. For  
Electrode Negative welding, connect the electrode  
cable to the "-" terminal of the welder and work  
cable to the "+" terminal of the welder.  
TABLE A.1  
Weld Current  
60% Duty  
Cycle  
Total Cable Length  
(electrode cable + work cable)  
50 - 100' 100 - 150' 150 - 200' 200 - 250'  
(15-30 m) (30 - 46m) (46 - 61m) (61m - 76m)  
3. Attach the work clip lead from the front of the LN-15  
to work using the spring clip at the end of the lead.  
This is a control lead to supply current to the wire  
feeder motor; it does not carry welding current.  
200 Amps  
300 Amps  
400 Amps  
2 AWG  
1 AWG  
2/0  
2 AWG  
1 AWG  
2/0  
1 AWG  
1/0  
1/0  
2/0  
3/0  
4. Set the MODE switch on the engine drive to CV-  
WIRE.  
3/0  
ELECTRODE CONNECTION  
5. Set the WELD TERMINALS switch to WELD TER-  
MINALS ON.  
Route the electrode cable through the strain relief in  
the rear of the case. Connect the electrode cable to the  
LN-15 input stud using the mounting hardware provid-  
ed. Secure the cable by tightening the strain relief.  
6. Set the WIRE FEEDER VOLTMETER switch to  
either "+" or "-" as required by the electrode polarity  
being used.  
All domestic models are supplied with pigtail for cus-  
tomers that prefer to make a taped and bolted connec-  
tion externally. CE models have a male twist connector  
for the electrode connection.  
7. Set the ARC CONTROL knob to "0" initially and  
adjust to suit.  
8. Set the IDLE switch to the AUTO position.  
Important: Some older engine drives may require  
the IDLE switch to be in the HIGH position for prop-  
er LN-15 operation.  
WORK CONNECTION  
Connect a work lead of sufficient size between the  
proper output stud on the power source and the work.  
Be sure the connection to the work makes tight metal  
to metal electrical contact. Poor work lead connections  
can result in poor welding performance.  
POWER SOURCE CONNECTION  
The LN-15 can be used with any DC welding power  
source. A constant voltage power source is recom-  
mend; however, the LN-15 can also be used with a  
constant current power source as long as the open cir-  
cuit voltage is less than 110VDC.  
LN-15  
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A-5  
A-5  
INSTALLATION  
CONNECTION DIAGRAM, ACROSS THE ARC MODEL Set-Up ( See Figure A.1)  
Typically used for general fabrication, maintenance and repair jobs because it’s easy to set up and operate.  
Requires only one cable-less to carry. Contactor standard on Across The Arc Model.  
FIGURE A.1  
RANGER 8  
SAE 400 WITH CV ADAPTER  
semiautomatic  
Output Termminals  
Always Hot.  
ENGINE DRIVEN WELDERS  
WITH WIRE FEED MODULE  
(LOCAL MODE AND CV ADAPTER)  
Electrode Cable  
Work  
Clamp  
Output Terminals  
Always Hot.  
CV250  
CV300  
CV400  
semiautomatic  
wire feeder  
Order K484 Jumper  
Plug Kit.  
K1870-1  
Electrode Cable  
Work  
Clamp  
CV655, DC400, DC600,  
DC655, V350-PRO,  
Output Terminals  
Always Hot.  
RANGER 9, RANGER 300 DLX  
COMMANDER 300  
COMMANDER 500  
RANGER 250  
semiautomatic  
wire feeder  
K1870-1  
Power source contactor  
switch must be in the  
"ON" position or use a  
K848 Junper Plug Kit.  
RANGER 305G  
Electrode Cable  
Work  
Clamp  
Output Termminals  
Output  
Always Hot.  
semiautomatic  
wire feeder  
K1870-1  
CC POWER SOURCE  
Electrode Cable  
Work  
Clamp  
Although a constant voltage (CV) power source is recommended for best results with Innershield® and gas metal  
arc (GMAW) open arc welding, satisfactory general purpose welding may be obtained using the LN-15 with a con-  
stant current (CC) power source for non-critical commercial quality mild steel welding applications.  
LN-15  
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A-6  
A-6  
INSTALLATION  
PROCEDURE TO INSTALL DRIVE ROLLS  
AND WIRE GUIDES  
GUN AND CABLE ASSEMBLIES  
A variety of Lincoln 10' (3.0m) or 15' (4.6m) gun and  
cable assemblies are available for use with the LN-15,  
including the Magnum™ models for GMAW, K126 or  
K115 models for Innershield®.  
WARNING  
• Turn off input power at the welding  
power source before installation or  
changing drive roll and/or wire  
guides.  
The LN-15 comes factory equipped with a K1500-2  
gun connection kit, designed for guns having a  
Magnum Tweco™ compatible #2-#4 connector. Many  
other guns can easily be used with the LN-15 with  
other K1500 series gun connection kits.  
• Do not touch electrically live parts  
0such as the wire drive or internal wiring.  
• When feeding with the gun trigger, the electrode  
and wire drive mechanism are "hot" to work and  
ground and could remain energized several sec-  
onds after the gun trigger is released.  
• Only qualified personnel should perform this  
operation.  
------------------------------------------------------------------------  
1. Turn OFF the welding power source.  
2. Open the LN-15 case and then release the idle roll  
pressure arm.  
Gun Cable Connection to the Feeder  
Lay the cable out straight. Insert the connector on the  
welding conductor cable into the brass bushing on the  
front of the wire drive unit. Keep the all mating surfaces  
clean. Make sure it is fully seated and tighten the  
thumb screw.  
Connect the control cable plug into the 5 pin recepta-  
cle on the front panel of the wire feeder.  
3. Remove the outer wire guide by turning the knurled  
thumbscrews counter-clockwise to unscrew them  
from the feed plate.  
4. Rotate the triangular shaped drive roll retaining  
mechanism to unlock the drive rolls and remove the  
drive rolls.  
ELECTRODE POLARITY  
The LN-15 automatically adjusts for positive and nega-  
tive polarity. When welding with negative polarity pro-  
cedures, the voltmeter will display a "-" sign; example  
"-23.6" Volts.  
CONNECTIONS  
Across the Arc LN-15 models do not use a control  
cable.  
Table A.2 Trigger Connector J1 (5 Pin)  
PIN  
A
B
Lead #  
556  
-
Function  
Trigger  
Not used  
C
554  
Trigger/ 83%  
Procedure ground  
83% Procedure  
Trigger/ 83%  
5. Remove the inner wire guide.  
D
E
555  
554  
6. Insert the new inner wire guide, groove side out,  
over the two locating pins in the feed plate.  
7. Install a drive roll on each hub assembly and lock by  
rotating the triangular drive roll retaining mecha-  
nism.  
Procedure ground  
8. Install the outer wire guide by aligning it with the pins  
and tightening the knurled thumbscrews.  
9. Close the idle arm and engage the idle roll pressure  
arm. Adjust the pressure appropriately.  
LN-15  
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A-7  
A-7  
INSTALLATION  
FEEDING WIRE ELECTRODE  
WARNING  
• ELECTRIC SHOCK CAN KILL.  
• When feeding electrode with the  
gun trigger, the electrode and wire  
drive mechanism are always "hot" to  
work and ground and could remain  
"hot" several seconds after the gun  
trigger is released.  
-----------------------------------------------------------------------  
2 STEP/TRIGGER  
INTERLOCK  
SWITCH  
COLD FEED/  
GAS PURGE  
1. Turn the reel or spool until the free end of the elec-  
trode is accessible.  
2. While tightly holding the electrode, cut off the bent  
end and straighten the first 6" (15 cm). Cut off the  
first 1" (2.5 cm). If the electrode is not properly  
straightened, it may not feed or may jam.  
3. Insert the free end through the incoming guide bush-  
ing.  
4. Press the Cold Feed switch and push the electrode  
into the drive roll.  
5. Feed the electrode through the gun.  
6. Adjust the brake tension with the thumbscrew on the  
spindle hub, until the reel turns freely but with little or  
no overrun when the wire feeding stops. Do not over  
tighten.  
LN-15  
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A-8  
A-8  
NOTES  
LN-15  
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Section B-1  
Section B-1  
TABLE OF CONTENTS  
- OPERATION SECTION -  
Operation ................................................................................................................Section B  
Safety Precautions .......................................................................................................B-2  
General Description ...............................................................................................B-3  
Duty Cycle..............................................................................................................B-3  
Operational Features and Controls ..............................................................................B-3  
Case Front Controls .....................................................................................................B-4  
Power-up Sequence.....................................................................................................B-5  
CV/CC Mode ................................................................................................................B-6  
WFS Units.....................................................................................................................B-6  
Internal Controls...........................................................................................................B-6  
Cold/Feed/Gas Purge Switch.......................................................................................B-7  
Two Step Trigger Interlock............................................................................................B-8  
Constant Current Operation.........................................................................................B-9  
Setting Wire Feed Speed ...........................................................................................B-10  
Making a Weld............................................................................................................B-11  
LN-15  
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B-2  
B-2  
OPERATION  
--------------------------------------------------------------------  
GRAPHIC SYMBOLS THAT APPEAR ON THIS  
MACHINE OR IN THIS MANUAL  
SAFETY PRECAUTIONS  
READ AND UNDERSTAND ENTIRE SECTION  
BEFORE OPERATING MACHINE.  
INPUT POWER  
WARNING  
• ELECTRIC SHOCK CAN KILL.  
Unless using COLD FEED fea-  
ture, when feeding with gun trig-  
ON  
ger, the electrode and drive  
mechanism are always electri-  
cally energized and could  
OFF  
remain energized several sec-  
onds after the welding ceases..  
• Do not attach the work clip to the roll cage or  
bottom skids. The work clip is energized any  
time the output of the welding power source is  
“ON”, even when the feeder is not welding.  
• Do not touch electrically live part or electrode  
with skin or wet clothing.  
WIRE FEEDER  
POSITIVE OUTPUT  
NEGATIVE OUTPUT  
• Insulate yourself from work and ground.  
• Always wear dry insulating gloves.  
• The serviceability of a product or structure uti-  
lizing the LN-15 wire feeder is and must be the  
sole responsibility of the builder/user. Many  
variables beyond the control of The Lincoln  
Electric Company affect the results obtained in  
using the LN-15 wire feeder. These variables  
include, but are not limited to, welding proce-  
dure, plate chemistry and temperature, weld-  
ment design, fabrication methods and service  
requirements. The available range of the LN-15  
wire feeder may not be suitable for all applica-  
tions, and the builder/user is and must be sole-  
ly responsible for welding settings.  
INPUT POWER  
DIRECT CURRENT  
OPEN CIRCUIT  
VOLTAGE  
U
0
---------------------------------------------------------------------  
• FUMES AND GASSES can be  
U
U
I
INPUT VOLTAGE  
OUTPUT VOLTAGE  
INPUT CURRENT  
1
2
dangerous.  
• Keep your head out of fumes.  
• Use ventilation or exhaust at the  
arc, or both, to remove fumes  
and gases from breathing zone  
and general area.  
---------------------------------------------------------------------  
• WELDING SPARKS can cause  
1
fire or explosion.  
• Keep flammable material away.  
I
OUTPUT CURRENT  
2
----------------------------------------------------------------------  
ARC RAYS can burn.  
PROTECTIVE  
GROUND  
• Wear eye, ear and body protec-  
tion.  
---------------------------------------------------------------------  
SEE ADDITIONAL WARNING INFORMATION  
UNDER ARC WELDING SAFETY PRECAUTIONS  
AND IN THE FRONT OF THIS OPERATING MANU-  
AL.  
WARNING OR  
CAUTION  
LN-15  
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B-3  
B-3  
OPERATION  
GENERAL DESCRIPTION  
DUTY CYCLE  
The LN-15 wire feeders are intended for semi-auto-  
matic use. The maximum rating of the LN-15 is based  
upon a 60% duty cycle; welding 6 minutes of welding  
followed by 4 minutes of idling within a 10 minute peri-  
od.  
The LN-15 is a light weight, portable, durable semi-  
automatic wire feeder.  
The LN-15 accommodates spools 8" (200mm) diame-  
ter up to 4" (100mm) wide.  
The domestic feeders comes factory equipped with a  
K1500-2 Magnum Tweco-compatible style #2-#4 gun  
bushing. Other K1500 series gun bushings are avail-  
able as field installed options. European models are  
factory equipped with a Fast-Mate adapter.  
RECOMMENDED PROCESSES  
The LN-15 wire drive feeds electrode for various  
processes as follows:(See Table B.1)  
The Across the Arc Model is suitable for GMAW,  
GMAW-Pulse and FCAW semi-automatic applications  
within the rated duty cycle.  
The wire drive is capable of operating in either a "CV"  
or "CC" mode. A constant voltage (CV) power source is  
recommended for flux-cored arc welding (FCAW) and  
gas metal arc welding (GMAW) to obtain code quality  
results. However, the LN-15 may also be used with a  
constant current (CC) power source to obtain passable  
results for non-critical quality applications.  
PROCESS LIMITATIONS  
• The across the arc model is not recommended for  
spot or stitch welding.  
• The across the arc model is not recommended for  
GMAW-STT, SAW, SMAW, GTAW or CAG.  
The “dual procedure” mode drops the WFS to 83% of  
the original set point. The voltage setting remains the  
same.  
EQUIPMENT LIMITATIONS  
• Burn-back is adjustable from 0.0 to 0.25 seconds,  
with a default of 0.00 seconds.  
• The preflow time is adjustable from 0.00 to 2.50 sec-  
onds, with a default of 0.00 seconds.  
• The postflow time is adjustable from 0.0 to 10.0 sec-  
onds, with a default setting of 0.0 seconds.  
Codes 10864, 10865  
• The LN-15 cannot be used with K489-7 Fast Mate  
Gun receiver bushing or K1500-4 gun adapter bush-  
ing.  
Codes 11033 and higher  
• The LN-15 cannot be used with the K1500-4 gun  
adapter bushing.  
The Across the Arc Model is capable of operating with  
Lincoln DC power sources supplying between 15VDC  
and 110 VDC. Simply attach the work clip to the work  
piece and then connect the LN-15 to the electrode  
cable to the power source and it is ready to weld.  
OPERATIONAL FEATURES AND  
CONTROLS  
• Built in flow meter for adjusting shielding gas.  
• Cold Feed/Gas Purge switch.  
• 2 step/Trigger Interlock switch (codes 11033 and  
above only.)  
An internal contactor in Across the Arc Models ener-  
gizes the electrode output in response to the gun trig-  
ger.  
• Digital wire feed speed control.  
• Digital display of welding voltage.  
• Adjustable preflow and postflow times  
• Adjustable burnback times.  
• On/Off switch (codes 11033 and above only.)  
TABLE B.1  
Process  
GMAW  
Wire Diameter Range  
Wire Feed Speed Range  
0.023 - 0.052" (0.6 - 1.3 mm)  
0.045 - 0.052" (1.2 - 1.3 mm)  
1/16 - 5/64" (1.6 - 2.0 mm)  
50 - 700 ipm (1.3 - 17.8 m/minute)  
50 - 700 ipm (1.3 - 17.8 m/minute)  
50 - 400 ipm (1.3 - 10.2 m/minute)  
FCAW  
FCAW  
LN-15  
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B-4  
B-4  
OPERATION  
CASE FRONT CONTROLS (See Figure B.1)  
ACROSS THE ARC MODEL  
3. WIRE FEED SPEED KNOB-The Wire Feed Speed  
knob is a 3-3/4 turn potentiometer that adjusts of  
the rate of feeding electrode. The wire feed speed  
range is 50 - 700 inches/min (1.3 - 17.8 m/min)  
1. WIRE FEED SPEED DISPLAY-The Wire Feed  
Speed display shows the rate the LN-15 will feed  
electrode during welding. The default WFS units for  
domestic models are inches/minute and can be  
changed to meters/minute through the configuration  
menu. The default WFS units for the European  
models are m/min. The wire feed speed is calibrat-  
ed to within ±2%.  
4. TRIGGER CONNECTOR-5 Pin Receptacle is used  
to activate the Magnum Gun Switch.  
5. CONNECTOR BUSHING-This connection is for  
welding conductor cable assembly.  
6. WORK CLIP LEAD-This lead must be connected  
2. VOLTAGE DISPLAY-The voltage display shows the  
directly to the work using the spring clip.  
average arc voltage during welding. A minus sign "-  
"
appears when welding with electrode negative  
7. ON / OFF SWITCH-For codes 11033 and above:  
The ON / OFF Switch turns power on and off to the  
wire feeder.  
welding procedures. While welding, an LED will illu-  
minate below the voltage display. After welding, the  
average voltage will continue to be shown for 5 sec-  
onds after the end and the LED will flash. of the  
weld. When not welding, the display shows "- - - ".  
The voltage is calibrated to ±2% over a range of 10  
to 45 volts.  
83% PROCEDURE  
The LN-15 supports a special "dual procedure" mode.  
When activated, the wire feed speed is reduced to 83%  
of the set value, but no less than 50 inches/minute  
(1.27 m/min). The 83% procedure is most commonly  
used during pipe and out of position welding. Requires  
Magnum 400 Dual Procedure Gun  
The voltage display is not a "preset" voltage.  
Refer to the examples from Figure B.1a.  
FIGURE B.1a  
Equivalent.  
FIGURE B.1  
2
1
3
7
5
4
6
LN-15  
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B-5  
B-5  
OPERATION  
LN-15 POWER-UP SEQUENCE  
Preflow:  
NORMAL POWER-UP DISPLAY  
Postflow:  
When power is first applied to the LN-15, the display  
will momentarily show set-up information. For exam-  
ple, it may show "CV" and "HI", indicating operation  
from a CV power source and the wire drive is config-  
ured for the high speed gear. Because of limitations in  
the display, "CV" will appear as "Cu".  
Burnback:  
3. Activate and then release the GAS PURGE switch  
to select the timer. The time will then display in the  
right hand side of the display. Example:  
4. Rotate the WFS knob to adjust the time to the new  
setting.  
After a brief moment, the LN-15 will then display the  
WFS and "---". No voltage is displayed until the trigger  
is pressed.  
WFS  
5. Press the GAS PURGE switch again to save the  
setting. The LN-15 will then return to the original  
"Press Spin" mode in step 1.  
PREFLOW, POSTFLOW AND BURNBACK TIMES  
6. To exit the "Press Spin" set-up mode, turn off power  
to the LN-15, or simply wait 15 seconds and the LN-  
15 will enter normal operation.  
Preflow, Postflow and Burnback times are all  
adjustable on the LN-15. The LN-15 is factory set with  
all the times set to 0.0 seconds.  
WELDING MODE CV/CC MODE AND WFS UNITS  
• The burnback time is adjustable from 0.00 to 0.25  
seconds.  
The CV/CC mode and WFS units are all readily  
changed during the power-up sequence. The LN-15 is  
factory set for "CV" welding power sources and "inch-  
es per minute" for the wire feed speed units.  
• The CV/CC mode is selectable for either CV for  
Constant Voltage power sources and CC for  
Constant Current power sources. Use CV power  
sources when making critical welds.  
• The preflow time is adjustable from 0.0 to 2.50 sec-  
onds.  
• The postflow time is adjustable from 0.0 to 10.0 sec-  
onds.  
CHANGING PREFLOW, POSTFLOW OR BURNBACK TIMES:  
1. Enter the “Press Spin” Set-Up Mode:  
• The WFS units is selectable for either in/min and  
m/min.  
While the power to the LN-15 is off, activate and  
hold the GAS PURGE switch (Down Position). Turn  
on power to the LN-15, and continue to hold the  
GAS PURGE switch until the LN-15 displays "Press  
CHANGING THE CV/CC MODE, OR WFS UNITS:  
COLD  
FEED  
1. Enter the “Press Spin” Set-Up Mode:  
While the power to the LN-15 is off, activate and  
hold the GAS PURGE switch (Down Position). Turn  
on power to the LN-15, and continue to hold the  
GAS PURGE switch until the LN-15 displays "Press  
spin". Release the GAS PURGE switch.  
The LN-15 is now in the "Press Spin" set-up mode. If  
after 15 seconds no other action is taken, the LN-15  
will then revert to normal operation.  
GAS PURGE  
Spin". Release the GAS PURGE switch. The LN-15  
is now in the "Press Spin" set-up mode. If after 15  
seconds no other action is taken, the LN-15 will  
then revert to normal operation.  
COLD  
FEED  
2. Rotate the WFS knob until the desired timer is dis-  
played.  
GAS PURGE  
LN-15  
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B-6  
B-6  
OPERATION  
INTERNAL CONTROLS (Figure B.2)  
Rotate the WFS knob until the desired parameter is  
displayed.  
COLD FEED/  
2 STEP/TRIGGER  
GAS PURGE  
SWITCH  
INTERLOCK  
SWITCH  
SPRING  
TENSION  
ARM  
SPINDLE  
BRAKE  
CV/CC Mode:  
WFS Units:  
2. Activate and release the GAS PURGE switch to  
select the parameter. The present value will then  
display in the right hand side of the display.  
Example:  
FLOWMETER  
SPRING TENSION ARM  
3. Rotate the WFS knob to change the parameter set-  
ting.  
The pressure arm controls the amount of force the drive  
rolls exert on the wire. Proper adjustment of both pressure  
arm gives the best welding performance. For best results,  
set both pressure arms to the same value.  
Set the pressure arm as follows (See Figure B.2a):  
Aluminum wires  
Cored wires  
Steel, Stainless wires between 4 and 6  
between 1 and 3  
between 3 and 4  
WFS  
Figure B.2a  
CV/CC MODE:  
• "CU" for Constant Voltage power sources  
• "CC" for Constant Current power sources  
WFS UNITS:  
• "US" for in/min  
• "Eur" for m/min  
CORED WIRES  
SOLID WIRES  
1
3
5
ALUMINUM  
2
4
6
OU TER SHIELD  
METALSHIELD  
INNERSHIELD  
4. Press the GAS PURGE switch to save the setting.  
The LN-15 will then return to the original "Press  
Spin" mode in step 1.  
STEEL  
STAINLESS  
5. To exit the "Press Spin" set-up mode, turn off power  
to the LN-15, or simply wait 15 seconds and the LN-  
15 will enter normal operation.  
LN-15  
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B-7  
B-7  
OPERATION  
WIRE DRIVE CONFIGURATION  
(See Figure B..2b)  
Changing the Gun Receiver Bushing  
6. Remove the outer wire guide, and push the gun  
bushing out of the wire drive. Because of the pre-  
cision fit, light tapping may be required to remove  
the gun bushing.  
7. Disconnect the shielding gas hose from the gun  
bushing, if required.  
ELECTRIC SHOCK can kill.  
• Turn the input power OFF at the  
welding power source before  
installation or changing drive rolls  
and/or guides.  
8. Connect the shielding gas hose to the new gun  
bushing, if required.  
9. Rotate the gun bushing until the thumb screw hole  
aligns with the thumb screw hole in the feed plate.  
Slide the gun receiver bushing into the wire drive  
and verify the thumb screw holes are aligned.  
10. Tighten the socket head cap screw.  
11. Insert the welding gun into the gun bushing and  
tighten the thumb screw.  
• Do not touch electrically live parts.  
• When inching with the gun trigger, electrode and  
drive mechanism are "hot" to work and ground  
and could remain energized several seconds  
after the gun trigger is released.  
• Only qualified personnel should perform mainte-  
nance work.  
-----------------------------------------------------------------------  
Tools required:  
COLD FEED/GAS PURGE SWITCH  
• 1/4" hex key wrench.  
Cold Feed and Gas Purge are combined into a single  
spring centered toggle switch.  
Note: Some gun bushings do not require the use of  
the thumb screw.  
To activate Cold Feeding, hold the switch  
in the UP position. The wire drive will feed  
electrode but neither the power source nor  
the gas solenoid will be energized. Adjust  
the speed of cold feeding by rotating the  
WFS knob. Cold feeding, or "cold inching"  
the electrode is useful for threading the  
electrode through the gun.  
1. Turn power off at the welding power source.  
2. Remove the welding wire from the wire drive.  
3. Remove the thumb screw from the wire drive.  
4. Remove the welding gun from the wire drive.  
5. Loosen the socket head cap screw that holds the  
connector bar against the gun bushing.  
Important: Do not attempt to completely remove  
the socket head cap screw.  
FIGURE B.2b  
THUMB SCREW  
GUN RECEIVER BUSHING  
OUTER WIRE GUIDE  
CONNECTOR BLOCK  
SOCKET HEAD  
CAP SCREW  
LOOSEN  
TIGHTEN  
LN-15  
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B-8  
B-8  
OPERATION  
Hold with toggle switch in the DOWN position to acti-  
vate Gas Purge and let the shielding gas flow. The gas  
solenoid valve will energize but neither the power  
source output nor the drive motor will be turned on.  
The Gas Purge switch is useful for setting the proper  
flow rate of shielding gas. Flow meters should always  
be adjusted while the shielding gas is flowing.  
SCFH  
10  
20  
30  
40  
50  
60  
70  
80  
Liter/Min.  
4.7  
9.4  
14.2  
18.9  
23.6  
28.3  
33.1  
37.8  
2 STEP - TRIGGER INTERLOCK SWITCH  
The 2 Step - Trigger Interlock switch  
changes the function of the gun trigger. 2  
Step trigger operation turns welding on  
and off in direct response to the trigger.  
Trigger Interlock operation allows weld-  
ing to continue when the trigger is  
released for comfort on long welds.  
SPINDLE BRAKE  
Adjust the spindle brake tension to allow the spool to  
spin freely, yet have enough resistance for little or no  
overrun when wire feeding is stopped.  
SHIELDING GAS CONNECTION  
Place the toggle switch in the UP position  
for 2 Step operation or in the DOWN  
position for Trigger Interlock operation.  
WARNING  
CYLINDER may explode if  
damaged.  
2 Step Trigger  
2 Step trigger operation is the most common. When  
the gun trigger is pulled, the welding power source  
energizes the electrode output and the wire feeder  
feeds wire for welding. The power source and wire  
feeder continue welding until the trigger is released.  
• Keep cylinder upright and  
chained to support.  
• Keep cylinder away from areas where it may be  
damaged.  
Trigger Interlock  
Trigger Interlock operation provides for operator com-  
fort when making long welds. When the gun trigger is  
first pulled, the welding power source energizes the  
output and the wire feeder feeds wire for welding. The  
gun trigger is then released while the weld is made. To  
stop welding, the gun trigger is pulled again, and when  
it is released the welding power source output turns off  
and the wire feeder stops feeding wire.  
• Never lift welder with cylinder attached.  
• Never allow welding electrode to touch cylinder.  
• Keep cylinder away from welding or other live  
electrical circuits.  
-----------------------------------------------------------------------  
WARNING  
• BUILD UP OF SHIELDING GAS MAY HARM  
HEALTH OR KILL.  
• Shut off shielding gas supply when not in use.  
• See American National Standard Z-49.1, "Safety  
in Welding and Cutting” Published by the  
American Welding Society.  
------------------------------------------------------------------------  
Customer must provide a cylinder of shielding gas, a  
pressure regulator, a flow control valve and a hose  
from the flow valve to the gas inlet fitting of the LN-15.  
CAUTION  
If the arc goes out while welding with trigger inter-  
lock operation, the electrode output from the weld-  
ing power source remains energized and the wire  
feeder will continue to feed wire until the gun trig-  
ger is again pulled and then released.  
------------------------------------------------------------------------  
FLOW METER  
The flowmeter shows the flow rate of shielding gas and  
has a valve to adjust the flow. The flow meter is cali-  
brated for CO2, Ar, and CO2/Ar blends. The middle of  
the ball indicates the flow rate of shielding gas.  
Connect a supply hose from the gas cylinder flow valve  
outlet to the 5/8-18 female inert gas fitting on the back  
of the LN-15.  
Adjust the flow rate by turning the valve at the bottom  
of the meter. Most weld procedures require 25-40 scfh  
(11.8 - 18.9 lpm) for sufficient shielding gas coverage.  
Gun angle, nozzle diameter, joint configuration and  
wind conditions may effect the amount of shielding gas  
required.  
LN-15  
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B-9  
B-9  
OPERATION  
If the contact tip to work distance is properly main-  
tained, a satisfactory operating voltage range may be  
achieved, and a sound weld may result. However,  
when a welder uses a longer contact tip to work dis-  
tance, an arc-sensing wire feeder compensates by  
increasing the wire feed speed to regulate the voltage.  
Even if the voltage and current remain unchanged, the  
increased wire feed speed may result in a deposition  
rate well beyond the specified range of the electrode.  
Under these conditions, the specified weld metal prop-  
erties may not be achieved.  
CONSTANT CURRENT OPERATION  
( See Figure B.3)  
CAUTION  
Lincoln Electric does NOT recommend constant  
current semiautomatic welding for applications  
which need to meet specified weld metal chemical  
or mechanical property requirements or weld qual-  
ity requirements.  
------------------------------------------------------------------------  
Constant voltage power sources deliver large current  
surges to stabilize the arc when the electrode is short-  
ed or the arc length is very short. However, a constant  
current power source does not provide such a  
response to stabilize the arc. It may be difficult to  
achieve required weld metal properties, or to achieve  
the required quality of welds needed to pass nonde-  
structive tests, when such welds are made under con-  
stant current operation.  
Most semiautomatic welding processes perform better  
using constant voltage power sources.  
Welding codes usually do not address the power source  
selection or specifically, whether the welding process is to  
be operated in the constant voltage or constant current  
mode. Instead, codes typically specify limitations on the  
current, voltage, heat input and preheat temperature  
based on the material to be welded. The intention is to  
assure that proper weld material properties will develop.  
Welding is sometimes performed using constant current  
power sources. The operation can be more convenient  
because it may allow the use of an existing stick (SMAW)  
power source and the power source can be placed at a  
distant location without any provision for adjusting the out-  
put settings.  
For constant current operation, the power source is set to  
deliver the specified current. The power source regulates  
this current regardless of changes in the welding circuit,  
including cable length, electrode diameter, wire feed  
speed, contact tip to work distance, etc.  
Changes in the wire feed speed (WFS) or contact tip to  
work distance (CTWD) affect the arc voltage when  
constant current power sources are used. Lowering  
the wire feed speed raises the voltage, raising the wire  
feed speed lowers the voltage. Lengthening the con-  
tact tip to work distance raises the voltage, shortening  
the contact tip to work distance lowers the voltage.  
FIGURE B.3  
Current  
Welding Cable  
LN-15  
GUN AND CABLE  
ASSEMBLY  
Wire  
Feeder  
+
-
CTWD  
(Electrode)  
WFS  
Constant Current  
Power Source  
Current  
Welding Cable  
(Work)  
LN-15  
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B-10  
B-10  
OPERATION  
The wire will feed at the DESIRED IN/MIN speed when the welding  
power source is set to the arc voltage to be used for the weld  
procedure (375 in/min. at 29V for example used).  
SETTING ARC SENSING WIRE FEED SPEED FOR  
CONSTANT CURRENT OPERATION  
The CC wire speed setting graph is shown in TABLE B.1, giving  
the Wire Speed dial setting required for the DESIRED IN/MIN  
and ARC VOLTS used for the welding procedures:  
When using a constant current (formerly variable voltage)  
power source, welding performance is improved using arc  
sensing wire feed speed (CC operation). In this wire feed  
mode the wire speed increases if arc voltage increases, and  
decreases if arc voltage decreases, but remains constant at  
any specific voltage level.  
TABLE B.1 CC WIRE SPEED SETTING  
Arc Volts Used  
Desired  
In/Min  
16 18 20 22 24 26 28 30 32 34  
The LN-15 permits accurate presetting of the desired  
wire feed speed, for the desired arc voltage to be used,  
by setting the Wire Feed Speed in the following manner  
before welding:  
50  
60  
70  
80  
90  
109 97 88 80 73 67 63 58 55 51  
131 117 105 95 88 81 75 70 66 62  
153 136 123 111 102 94 88 82 77 72  
175 156 140 127 117 108 100 93 88 82  
197 175 158 143 131 121 113 105 98 93  
a. Activate press and spin during power up and change  
to the CC mode. See “Changing the CV/CC mode  
or WFS units” in this Operation Section.  
100  
110  
120  
130  
140  
219 194 175 159 146 135 125 117 109 103  
241 214 193 175 160 148 138 128 120 113  
263 233 210 191 175 162 150 140 131 124  
284 253 228 207 190 175 163 152 142 134  
306 272 245 223 204 188 175 163 153 144  
150  
160  
170  
180  
190  
328 292 263 239 219 202 188 175 164 154  
350 311 280 255 233 215 200 187 175 165  
372 331 298 270 248 229 213 198 186 175  
394 350 315 286 263 242 225 210 197 185  
416 369 333 302 277 256 238 222 208 196  
200  
210  
220  
230  
240  
438 389 350 318 292 269 250 233 219 206  
459 408 368 334 306 283 263 245 230 216  
481 428 385 350 321 296 275 257 241 226  
503 447 403 366 335 310 288 268 252 237  
525 467 420 382 350 323 300 280 263 247  
250  
260  
270  
280  
290  
547 486 438 398 365 337 313 292 273 257  
569 506 455 414 379 350 325 303 284 268  
591 525 473 430 394 365 338 315 295 278  
613 544 490 445 408 377 350 327 306 288  
634 564 508 461 423 390 363 338 317 299  
300  
310  
320  
330  
340  
656 583 525 477 438 404 375 350 328 309  
678 603 543 493 452 417 388 362 339 319  
700 622 560 509 467 431 400 373 350 329  
642 578 525 481 444 413 385 361 340  
661 595 541 496 458 425 397 372 350  
350  
360  
380  
400  
420  
681 613 557 510 471 438 408 383 360  
700 630 572 526 484 450 420 394 370  
666 604 554 512 472 444 416 392  
700 636 584 538 500 466 438 412  
668 612 566 526 490 460 432  
FIGURE B.4 CC WIRE SPEED SETTING  
b. Referring to the graph located above the Mode switch  
(also shown in Figure B.4):  
440  
460  
480  
500  
700 642 592 550 514 482 452  
670 620 576 536 504 472  
700 646 600 560 526 494  
674 626 584 546 514  
1. Select the horizontal line representing the DE-  
SIRED IN/MIN. for the welding procedure. (See  
example arrow line for 375 in/min.)  
2. Select the diagonal line representing the ARC  
VOLTS to be used for the welding procedure. (See  
example arrow line for 29 volts.)  
520  
540  
560  
580  
600  
700 650 606 568 536  
676 630 590 556  
700 654 612 576  
676 634 598  
3. Determine the vertical line representing the CC  
WIRE SPEED SETTING where the above two lines  
cross. (See example arrow line for 450.)  
700 656 618  
620  
640  
660  
680  
700  
678 638  
700 658  
680  
c. Adjust the WFS display to the value determined in  
Step (3) above (450 for example used).  
700  
Desired IPM  
Arc Volts  
CC Speed Setting =  
X 35  
LN-15  
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B-11  
B-11  
OPERATION  
MAKING A WELD  
The serviceability of a product or structure utilizing the  
LN-15 wire feeder is and must be the sole responsibil-  
ity of the builder/user. Many variables beyond the con-  
trol of The Lincoln Electric Company affect the results  
obtained in using the LN-15 wire feeder. These vari-  
ables include, but are not limited to, welding proce-  
dure, plate chemistry and temperature, weldment  
design, fabrication methods and service requirements.  
The available range of the LN-15 wire feeder may not  
be suitable for all applications, and the builder/user is  
and must be solely responsible for welding settings.  
• Close the door on the LN-15.  
• Connect the work cable to the metal to be welded.  
The work cable must make good electrical contact to  
the work. The work must also be grounded as stated  
in "Arc Welding Safety Precautions".  
• Connect the LN-15 electrode cable to the power  
source for the polarity and process to be used.  
Check that the appropriate power source settings are  
made for the procedure to be used. (Refer to the  
power source operating and connection instructions.)  
• Place the LN-15 conveniently near the work area in a  
safe location to minimize exposure to weld spatter  
and to avoid sharp bends in the gun cable.  
• Connect the LN-15 work clip to the work.  
• Be sure the proper contact tip for the wire size being  
used is in the gun.  
• Turn on the welding power source, as well as the  
shielding gas supply (if used.)  
• Cut the electrode within approximately 3/8" (10mm)  
of the end of the contact tip for solid wire and within  
3/4" (19mm) of the extension guide for cored wire.  
• Position the electrode over the joint. The end of the  
electrode should be slightly off the work.  
• Lower welding helmet, close the gun trigger and  
begin welding. Hold the gun so the contact tip to work  
distance gives the correct electrical stickout as  
required for the procedure being used.  
• To stop welding, release the gun trigger and the pull  
the gun away from the work.  
LN-15  
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B-12  
B-12  
NOTES  
LN-15  
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Section C-1  
Section C-1  
TABLE OF CONTENTS  
- ACCESSORIES SECTION -  
Accessories ............................................................................................................Section C  
Factory Installed Equipment.........................................................................................C-2  
Optional Equipment......................................................................................................C-2  
LN-15  
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C-2  
C-2  
ACCESSORIES  
FACTORY INSTALLED EQUIPMENT  
• K1500-2 Gun Receiver Bushing.  
OPTIONAL EQUIPMENT  
• K1500-1,-3,-5 Gun Receiver Bushings  
• Drive Roll Kits  
• Drive Roll Kits (Includes drive rolls and guide tube necessary to feed the identified wire  
size and type.  
WIRE TYPE  
ELECTRODE SIZE  
KP KIT  
Steel Wires:  
(Including stainless steel)  
.023-.030" (0.6-0.8mm)  
KP1696-030S  
KP1696-035S  
KP1696-045S  
KP1696-052S  
.035"  
.040-.045" (1.0-1.2mm)  
.052" (1.4mm)  
(0.9mm)  
Cored Wires:  
.030-.035" (0.8-0.9mm)  
.040-.045" (1.0-1.2mm)  
KP1697-035C  
KP1697-045C  
KP1697-052C  
KP1697-1/16C  
KP1697-068  
.052"  
1/16"  
.068"  
5/64"  
(1.4mm)  
(1.6mm)  
(1.7mm)  
(2.0mm)  
KP1697-5/64  
Aluminum Wires:  
.035"  
.040"  
3/64"  
(0.9mm)  
(1.0mm)  
(1.2mm)  
KP1695-035A  
KP1695-040A  
KP1695-3/64A  
LN-15  
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Section D-1  
Section D-1  
TABLE OF CONTENTS  
- MAINTENANCE SECTION -  
Maintenance...........................................................................................................Section D  
Routine Maintenance.....................................................................................................D-2  
Periodic Maintenance....................................................................................................D-2  
Calibration Specification ...............................................................................................D-2  
Major Component Locations.........................................................................................D-3  
LN-15  
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D-2  
D-2  
MAINTENANCE  
SAFETY PRECAUTIONS  
WARNING  
ELECTRIC SHOCK can kill.  
• Do not operate with covers  
removed.  
• Turn off power source before  
installing or servicing.  
• Do not touch electrically hot  
parts.  
• Turn the input power to the welding power  
source off at the fuse box before working in the  
terminal strip.  
• Only qualified personnel should install, use or  
service this equipment.  
ROUTINE MAINTENANCE  
Routine maintenance consists of periodically blowing  
out the machine, using a low pressure airstream, to  
remove accumulated dust and dirt from inside the  
feeder.  
PERIODIC MAINTENANCE  
• Replace the drive rolls and inner wire guide when  
they are worn.  
• Replace the pig tail if the insulation is cut, abraded or  
damaged.  
CALIBRATION SPECIFICATION  
All calibration is factory set on the LN-15.  
To verify the wire feed speed:  
• Assemble a .045 (1.2mm) drive roll kit into the LN-  
15.  
• Load a spool of .045 (1.2mm) electrode and thread  
the electrode through the wire drive.  
• Adjust the wire feed speed to 300 in/min  
(7.62m/min).  
• Press the COLD FEED switch and measure the  
actual wire feed speed with a calibrated wire feed  
speed tachometer.  
• The measured wire feed speed should be within 2%  
of the set value.  
To verify the voltage display:  
• Set the welding power source and LN-15 to a CV  
procedure that gives steady "spray" transfer in the  
arc.  
• While a weld is being made, measure the voltage  
from the feed plate to work.  
• The displayed voltage on the LN-15 should be with-  
in 2% of the measured value.  
LN-15  
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D-3  
D-3  
MAINTENANCE  
FIGURE D.1 – MAJOR COMPONENT LOCATIONS  
1. Molded Case Assembly  
2. Control Box Assembly  
3. Control Box Cover Assembly  
4. Wire Drive & Contactor Assembly  
1
2
3
4
LN-15  
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D-4  
D-4  
NOTES  
LN-15  
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Section E-1  
Section E-1  
TABLE OF CONTENTS  
- THEORY OF OPERATION SECTION -  
Theory of Operation...............................................................................................Section E  
General Description ......................................................................................................E-2  
Input Power...................................................................................................................E-2  
Trigger & Control Circuits..............................................................................................E-3  
Wirefeed Speed Control & Feedback...........................................................................E-4  
Display Board ...............................................................................................................E-5  
FIGURE E.1 – LN-15 BLOCK LOGIC DIAGRAM  
LN-15 WIRE FEEDER  
DISPLAY BOARD  
ELECTRODE  
INPUT VOLTAGE  
CONTACTOR  
WELDING GUN  
FEED  
PLATE  
M
O
T
O
R
GAS  
SOLENOID  
HALL  
EFFECT  
MODULE  
"ELECTRODE"  
FEEDBACK  
VOLTAGE #67  
TOROID  
ASSEMBLY  
ARMATURE  
RPM FEEDBACK  
FULL  
WAVE  
BRIDGE  
ON/OFF  
SWITCH  
FEED HEAD  
BOARD SUPPLY  
BOOST  
POWER  
SUPPLY  
BOARD  
FEED HEAD  
CONTROL BOARD  
MOV  
WORK  
SENSING  
LEAD  
DRIVE MOTOR  
SUPPLY  
"WORK" VOLTAGE FEEDBACK #21  
SPI COMMUNICATIONS  
SHIELDED CABLE  
TRIGGER  
WIRE  
TRIGGER  
INTERLOCK  
SWITCH  
COLD  
INCH  
SWITCH  
DISPLAY  
BOARD  
INPUT &  
FEED  
PROCEDURE  
SPEED  
CONTROL  
LN-15  
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E-2  
E-2  
THEORY OF OPERATION  
FIGURE E.2 – GENERAL DESCRIPTION & INPUT POWER  
ELECTRODE  
INPUT VOLTAGE  
CONTACTOR  
WELDING GUN  
FEED  
PLATE  
M
O
T
O
R
GAS  
SOLENOID  
HALL  
EFFECT  
MODULE  
"ELECTRODE"  
FEEDBACK  
VOLTAGE #67  
TOROID  
ASSEMBLY  
ARMATURE  
RPM FEEDBACK  
FULL  
WAVE  
BRIDGE  
ON/OFF  
SWITCH  
FEED HEAD  
BOARD SUPPLY  
BOOST  
POWER  
SUPPLY  
BOARD  
FEED HEAD  
CONTROL BOARD  
MOV  
WORK  
SENSING  
LEAD  
DRIVE MOTOR  
SUPPLY  
"WORK" VOLTAGE FEEDBACK #21  
SPI COMMUNICATIONS  
SHIELDED CABLE  
TRIGGER  
WIRE  
TRIGGER  
INTERLOCK  
SWITCH  
COLD  
INCH  
SWITCH  
DISPLAY  
BOARD  
INPUT &  
FEED  
PROCEDURE  
SPEED  
CONTROL  
GENERAL DESCRIPTION  
INPUT POWER  
The LN-15 is a lightweight portable semi-automatic  
wire feeder. The “Across the Arc” model is capable of  
operating with Lincoln DC power sources supplying  
between 15VDC to 110VDC. The LN-15 is designed  
for semi-automatic use and has a 60% duty cycle rat-  
ing.  
The DC voltage supplied from the power source is  
applied to the LN-15 through the electrode cable and  
the work sensing lead. The voltage is applied to the  
full wave bridge through a toroid assembly. When the  
ON/OFF switch is put in the ON position the positive  
DC voltage from the bridge is applied to the  
Boost/Power Supply board through an M.O.V. assem-  
bly. This M.O.V. is needed to protect the Boost/Power  
board from inductive energy stored in the welding  
cables.  
By attaching the work clip to the work piece and the  
LN-15 electrode cable to the Lincoln power source the  
LN-15 is ready to feed wire and weld. The LN-15 can  
be connected for either welding polarity without any  
changes to the LN-15. When the gun trigger is acti-  
vated and wire feeds and an internal contactor ener-  
gizes the electrode output.  
The Boost/Power Board takes the weld voltage and  
boosts it to 80VDC or the actual arc voltage being  
applied. (Whichever is greater). The outputs of the  
Boost/Power board are two separate 80VDC+ supply  
voltages. One of these is utilized and regulated by the  
Feed Head Control board to power the wire drive  
motor. The other 80VDC supply is regulated to create  
several plus and minus regulated DC supplies. These  
+/-15VDC and +/-5VDC supplies are used to power  
the electronics within the Feed Head board and other  
components in the LN-15 such as the gas solenoid.  
The wire drive is capable of operating in either the con-  
stant voltage or the constant current mode. A con-  
stant current voltage power source is recommended  
for flux-cored arc welding (FCAW) and gas metal arc  
welding (GMAW) to obtain code quality results.  
For non-critical quality applications a constant current  
power source may be used.  
The LN-15 comes factory equipped with a K1500-2  
Tweco style #2-#4 gun bushing.  
The “dual procedure” mode drops the wire feed speed  
83% from the original set point. The voltage setting  
remains the same.  
LN-15  
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E-3  
E-3  
THEORY OF OPERATION  
FIGURE E.3 – TRIGGER & CONTROL CIRCUITS  
ELECTRODE  
INPUT VOLTAGE  
CONTACTOR  
WELDING GUN  
FEED  
PLATE  
M
O
T
O
R
GAS  
SOLENOID  
"ELECTRODE"  
FEEDBACK  
VOLTAGE #67  
HALL  
EFFECT  
MODULE  
TOROID  
ASSEMBLY  
ARMATURE  
RPM FEEDBACK  
FULL  
WAVE  
BRIDGE  
ON/OFF  
SWITCH  
FEED HEAD  
BOARD SUPPLY  
BOOST  
POWER  
SUPPLY  
BOARD  
FEED HEAD  
CONTROL BOARD  
MOV  
WORK  
SENSING  
LEAD  
DRIVE MOTOR  
SUPPLY  
"WORK" VOLTAGE FEEDBACK #21  
SPI COMMUNICATIONS  
SHIELDED CABLE  
TRIGGER  
INPUT &  
PROCEDURE  
TRIGGER  
INTERLOCK  
SWITCH  
COLD  
INCH  
SWITCH  
DISPLAY  
BOARD  
WIRE  
FEED  
SPEED  
CONTROL  
TRIGGER AND CONTROL CIRCUITS  
When the gun trigger is closed (activated) the Feed  
Head Board is “signaled” to apply armature voltage  
to the drive motor, activate the gas solenoid and  
close the LN-15 internal contactor. When the con-  
tactor is closed the welding current path from the  
electrode cable to the conductor block is completed.  
This sequence will supply electrode wire, arc voltage  
and current to the welding gun.  
The Cold Inch/Gas Purge Switch allows the user to  
feed wire without closing the contactor. This feature  
gives the operator an electrically “cold” electrode  
even though the power source’s output terminals are  
electrically “hot”. This switch also allows the user to  
activate the gas solenoid without feeding wire or  
closing the contactor.  
When activated the Trigger Interlock Switch keeps  
the gun trigger circuit closed even when the operator  
releases the trigger. This is useful when making long  
welds.  
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.  
LN-15  
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E-4  
E-4  
.THEORY OF OPERATION  
FIGURE E.4 – WIRE FEED SPEED CONTROL & FEEDBACK  
ELECTRODE  
INPUT VOLTAGE  
CONTACTOR  
WELDING GUN  
FEED  
PLATE  
M
O
T
O
R
GAS  
SOLENOID  
HALL  
EFFECT  
MODULE  
"ELECTRODE"  
FEEDBACK  
VOLTAGE #67  
TOROID  
ASSEMBLY  
ARMATURE  
RPM FEEDBACK  
FULL  
WAVE  
BRIDGE  
ON/OFF  
SWITCH  
FEED HEAD  
BOARD SUPPLY  
BOOST  
POWER  
SUPPLY  
BOARD  
FEED HEAD  
CONTROL BOARD  
MOV  
WORK  
SENSING  
LEAD  
DRIVE MOTOR  
SUPPLY  
"WORK" VOLTAGE FEEDBACK #21  
SPI COMMUNICATIONS  
SHIELDED CABLE  
TRIGGER  
WIRE  
TRIGGER  
INTERLOCK  
SWITCH  
COLD  
INCH  
SWITCH  
DISPLAY  
BOARD  
INPUT &  
FEED  
PROCEDURE  
SPEED  
CONTROL  
ule and the arc voltage. These three factors are com-  
pared and the appropriate armature voltage is applied  
to the wire feed motor to compensate for the varying  
arc lengths and associated arc voltages.  
WIRE FEED SPEED CONTROL AND  
FEEDBACK  
The combination of the Procedure Switch and the Wire  
Feed Speed control provide a command voltage for  
the Feed Head Control Board. The Hall Effect module  
(Tach) monitors the motor RPM and outputs a digital  
voltage frequency “feed back” that is delivered to the  
Feed Head Board.  
When operating in the constant voltage (CV) mode the  
Feed Head Board monitors the feedback signal and  
compares it to the command voltage and delivers the  
appropriate armature voltage to the wire feed motor.  
In this manner a constant wire feed speed is main-  
tained.  
When the LN-15 is connected to a constant current  
(CC) power source a variable wire feed speed is desir-  
able to compensate for the varying arc voltages asso-  
ciated with the constant current process. To accom-  
plish this the Feed Head Board monitors the command  
voltage, the feed back signal from the Hall Effect mod-  
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.  
LN-15  
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E-5  
E-5  
THEORY OF OPERATION  
FIGURE E.5 – DISPLAY BOARD  
ELECTRODE  
INPUT VOLTAGE  
CONTACTOR  
WELDING GUN  
FEED  
PLATE  
M
O
T
O
R
GAS  
SOLENOID  
"ELECTRODE"  
FEEDBACK  
VOLTAGE #67  
HALL  
EFFECT  
MODULE  
TOROID  
ASSEMBLY  
ARMATURE  
RPM FEEDBACK  
FULL  
WAVE  
BRIDGE  
ON/OFF  
SWITCH  
FEED HEAD  
BOARD SUPPLY  
BOOST  
POWER  
SUPPLY  
BOARD  
FEED HEAD  
CONTROL BOARD  
MOV  
WORK  
SENSING  
LEAD  
DRIVE MOTOR  
SUPPLY  
"WORK" VOLTAGE FEEDBACK #21  
SPI COMMUNICATIONS  
SHIELDED CABLE  
TRIGGER  
INPUT &  
PROCEDURE  
TRIGGER  
INTERLOCK  
SWITCH  
COLD  
INCH  
SWITCH  
DISPLAY  
BOARD  
WIRE  
FEED  
SPEED  
CONTROL  
DISPLAY BOARD  
The Display Board provides information to the user  
through digital displays and LED’s. The Display Board  
communicates with the Feed Head Board via the SPI  
Bus cable.  
The wire feed speed display shows the rate that the  
LN-15 will feed wire during the welding process. The  
wire feed speed is calibrated to within +/-2%. It  
always displays the preset WFS.  
The arc voltage display shows the average actual arc  
voltage during the welding process. When welding  
ceases the average arc voltage will continue to be  
shown for 5 seconds. When not welding the display  
show “----“. The voltage is calibrated to +/-2% over a  
range of 10 to 45VDC. A negative “-“ will be automat-  
ically displayed when the LN-15 is configured for elec-  
trode negative processes.  
All of the LEDs will briefly light when the machine is  
first turned on.  
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.  
LN-15  
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E-6  
E-6  
NOTES  
LN-15  
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Section F-1  
Section F-1  
TABLE OF CONTENTS  
- TROUBLESHOOTING & REPAIR SECTION -  
Troubleshooting & Repair Section ........................................................................Section F  
How to Use Troubleshooting Guide..............................................................................F-2  
PC Board Troubleshooting Procedures and Replacement...........................................F-3  
Troubleshooting Guide..................................................................................................F-4  
Test Procedures  
Boost Power Board Test .................... .................................................................F-11  
Gas Solenoid Valve Test.......................................................................................F-15  
Contactor Test ......................................................................................................F-17  
Drive Motor Test ...................................................................................................F-19  
Hall Effect Module Test.........................................................................................F-21  
Replacement Procedures  
Contactor Removal and Replacement .................................................................F-23  
Feedhead Control Board Removal and Replacement .........................................F-27  
Boost Power Supply Board Removal and Replacement .....................................F-31  
Wire Drive Assembly Removal and Replacement................................................F-35  
Cover & Spindle Mount Removal and Replacement............................................F-37  
Roll Cage Removal and Replacement .................................................................F-41  
Retest After Repair ...............................................................................................F-43  
LN-15  
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F-2  
F-2  
TROUBLESHOOTING & REPAIR  
HOW TO USE TROUBLESHOOTING GUIDE  
CAUTION  
Service and repair should be performed by only Lincoln Electric Factory Trained Personnel.  
Unauthorized repairs performed on this equipment may result in danger to the technician and machine  
operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please  
observe all safety notes and precautions detailed throughout this manual.  
This Troubleshooting Guide is provided to help  
you locate and repair possible machine  
malfunctions. Simply follow the three-step  
procedure listed below.  
Step 3. PERFORM COMPONENT TESTS. The  
last column, labeled “Recommended Course of  
Action” lists the most likely components that may  
have failed in your machine. It also specifies the  
appropriate test procedure to verify that the  
subject component is either good or bad. If there  
are a number of possible components, check the  
components in the order listed to eliminate one  
possibility at a time until you locate the cause of  
your problem.  
Step 1. LOCATE PROBLEM (SYMPTOM). Look  
under the column labeled “PROBLEM  
(SYMPTOMS)”. This column describes possible  
symptoms that the machine may exhibit. Find  
the listing that best describes the symptom that  
the machine is exhibiting. Symptoms are  
grouped into three main categories: Feeding  
Problems and Welding Problems.  
All of the referenced test procedures referred to in  
the Troubleshooting Guide are described in detail  
at the end of this chapter. Refer to the  
Troubleshooting and Repair Table of Contents to  
locate each specific Test Procedure. All of the  
referred to test points, components, terminal  
strips, etc., can be found on the referenced  
electrical wiring diagrams and schematics. Refer  
to the Electrical Diagrams Section Table of  
Contents to locate the appropriate diagram.  
Step 2. PERFORM EXTERNAL TESTS. The  
second column, labeled “POSSIBLE AREAS OF  
MISADJUSTMENT(S)”, lists the obvious external  
possibilities that may contribute to the machine  
symptom. Perform these tests/checks in the  
order listed. In general, these tests can be  
conducted without removing the case  
wrap-around cover.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-3  
F-3  
TROUBLESHOOTING & REPAIR  
PC BOARD TROUBLESHOOTING PROCEDURES  
- Remove the PC board from the static-shielding bag  
and place it directly into the equipment. Don’t set the  
PC board on or near paper, plastic or cloth which  
could have a static charge. If the PC board can’t be  
installed immediately, put it back in the static-shield-  
ing bag.  
WARNING  
ELECTRIC SHOCK  
can kill.  
•
Have an electrician install and  
service this equipment. Turn the  
input power OFF at the fuse box  
before working on equipment. Do  
not touch electrically hot parts.  
- If the PC board uses protective shorting jumpers,  
don’t remove them until installation is complete.  
- If you return a PC board to The Lincoln Electric  
Company for credit, it must be in the static-shielding  
bag. This will prevent further damage and allow prop-  
er failure analysis.  
CAUTION  
Sometimes machine failures appear to be due to PC  
board failures. These problems can sometimes be  
traced to poor electrical connections. To avoid prob-  
lems when troubleshooting and replacing PC boards,  
please use the following procedure:  
4. Test the machine to determine if the failure  
symptom has been corrected by the  
replacement PC board.  
NOTE: It is desirable to have a spare (known good)  
PC board available for PC board troubleshooting.  
1. Determine to the best of your technical ability  
that the PC board is the most likely component  
causing the failure symptom.  
NOTE: Allow the machine to heat up so that all  
electrical components can reach their operating  
temperature.  
2. Check for loose connections at the PC board  
to assure that the PC board is properly  
connected.  
5. Remove the replacement PC board and  
substitute it with the original PC board to  
recreate the original problem.  
3. If the problem persists, replace the suspect PC  
board using standard practices to avoid static  
electrical damage and electrical shock. Read  
the warning inside the static resistant bag and  
perform the following procedures:  
a. If the original problem does not reappear by  
substituting the original board, then the PC  
board was not the problem. Continue to look  
for bad connections in the control wiring  
harness, junction blocks, and terminal strips.  
PC board can be damaged by static electricity.  
b. If the original problem is recreated by the  
substitution of the original board, then the PC  
board was the problem. Reinstall the  
replacement PC board and test the machine.  
- Remove your body’s static  
charge before opening the static-  
shielding bag. Wear an anti-static  
wrist strap. For safety, use a 1  
Meg ohm resistive cord connected  
6. Always indicate that this procedure was  
followed when warranty reports are to be  
submitted.  
to  
a
grounded part of the  
ATTENTION  
Static-Sensitive  
Devices  
Handle only at  
Static-Safe  
equipment frame.  
NOTE: Following this procedure and writing on the  
warranty report, “INSTALLED AND SWITCHED PC  
BOARDS TO VERIFY PROBLEM,” will help avoid  
denial of legitimate PC board warranty claims.  
- If you don’t have a wrist strap,  
touch an un-painted, grounded,  
part of the equipment frame. Keep  
touching the frame to prevent  
static build-up. Be sure not to  
touch any electrically live parts at  
the same time.  
Workstations  
- Tools which come in contact with the PC board must  
be either conductive, anti-static or static-dissipative.  
LN-15  
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F-4  
F-4  
TROUBLESHOOTING & REPAIR  
TROUBLESHOOTING GUIDE  
Observe Safety Guidelines  
detailed in the beginning of this manual.  
PROBLEMS  
(SYMPTOMS)  
POSSIBLE AREAS OF  
MISADJUSTMENT(S)  
FEEDING PROBLEMS  
RECOMMENDED  
COURSE OF ACTION  
Major physical or electrical damage 1. Contact your local authorized 1. Contact the Lincoln Electric  
is evident when the sheet metal  
cover(s) are removed.  
Lincoln Electric Field Service  
Facility for assistance.  
Service Department,  
1-888-935-3877.  
The LN-15 does not “power-up”  
when the on/off switch is turned to  
the ”ON”position.  
1. Make sure the correct input volt- 1. Check the on/off switch. See  
age is being applied (15 to  
110VDC). See Specifications  
Pages.  
the wiring diagram.  
2. Check the input rectifier bridge.  
See the wiring diagram.  
2. Make certain the “Work Clip” is 3. Perform the Boost Power  
attached securely to the work  
Supply Board Test.  
piece.  
4. The control board may be faulty.  
5. If the Display Board is not lit  
check the input voltages to the  
Display Board. See the Wiring  
Diagram.  
When the gun trigger is activated 1. Make sure the contactor is func- 1. Perform The Contactor Test.  
the wire drive runs and electrode  
wire feeds, but there is no welding  
output.  
tioning correctly.  
2. The Control Board may be faulty.  
2. Check the current carrying leads  
at the contactor and between  
the contactor and the feed plate  
for loose or faulty connections.  
See the Wiring Diagram.  
3. Make sure the welding gun is  
connected correctly and func-  
tioning correctly.  
4. Make certain the DC power  
source is functioning correctly.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-5  
F-5  
TROUBLESHOOTING & REPAIR  
TROUBLESHOOTING GUIDE  
Observe Safety Guidelines  
detailed in the beginning of this manual.  
PROBLEMS  
(SYMPTOMS)  
POSSIBLE AREAS OF  
MISADJUSTMENT(S)  
RECOMMENDED  
COURSE OF ACTION  
FEEDING PROBLEMS  
When the gun trigger is activated  
there is no wire feed.  
1. Check to see if the drive rolls  
are turning when the gun trigger  
is pulled. If the drive rolls are  
turning, then check for a  
mechanical restriction in the  
wire feed path.  
1. With the gun trigger circuit acti-  
vated (see the Wiring Diagram)  
and the LN-15 set for constant  
voltage operation, check the  
presence of 2.6 to 27.4VDC at  
leads 550+ to 551-. This is the  
voltage that is applied to the  
wire drive motor. This voltage  
is dependent upon the wire  
feed speed setting.  
2. If the drive rolls do not turn  
then check to make sure the  
correct DC voltage is being  
applied to the LN-15. (15-  
110VDC).  
2. If the correct voltage is being  
applied to the drive motor and  
the motor does not run the  
motor or motor brushes may be  
faulty.  
3. Make sure the gun trigger is  
functioning correctly.  
3. If the correct voltage is not  
being applied to the drive  
motor the Control Board may  
be faulty.  
The wire feeds for a short period  
of time but then stops feeding.  
When the gun trigger is released  
then re-activated the wire resumes  
feeding but soon stops again.  
1. The drive motor may be over-  
loaded. Check the wire feed-  
ing path for mechanical restric-  
tions.  
1. Check the motor armature cur-  
rent through either of the arma-  
ture leads (550 or 551). It  
should not exceed 3.5 amps  
DC.  
2. While welding make certain the  
power source arc voltage is  
staying above 15VDC. The  
feeder will not function properly  
on less than 15VDC.  
2. If more than 3.5 amps is indi-  
cated, then the motor is draw-  
ing too much current. Check or  
replace the motor brushes.  
3. If less than 3.5 amps is indicat-  
ed and the motor is being dis-  
abled by the Control Board,  
then the Control Board may be  
faulty. Replace.  
4. The motor or gearbox may be  
faulty. Replace.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-6  
F-6  
TROUBLESHOOTING & REPAIR  
TROUBLESHOOTING GUIDE  
Observe Safety Guidelines  
detailed in the beginning of this manual.  
PROBLEMS  
(SYMPTOMS)  
POSSIBLE AREAS OF  
MISADJUSTMENT(S)  
RECOMMENDED  
COURSE OF ACTION  
FEEDING PROBLEMS  
The wire stops or stubs while 1. If the LN-15 is connected to a 1. Monitor the motor armature  
welding.  
constant current power source  
the arc voltage may be “dip-  
ping” below the 15VDC thresh-  
old that is essential for proper  
operation.  
voltage (leads 550 to 551).  
Normal voltage range is 2.6VDC  
to 27.4VDC dependent upon  
wire feed speed. If the armature  
voltage is correct then check or  
replace the motor brushes.  
2. Try connecting the LN-15 to a  
constant  
source.  
voltage  
power 2. If the motor armature voltage is  
not correct then the Control  
Board may be faulty.  
3. Check for mechanical restric-  
tions in the wire feeding path.  
The wire feed speed range is only 1. The 83%wire feed speed dual 1. Turn off the 83% procedure  
50 to 374 IPM.(1.3 to 9.5m/min.  
procedure is activated with the  
low speed gear.  
switch to return to the full wire  
feed speed range.  
2. Check the wiring between the  
procedure switch and the con-  
trol board.  
Diagram.  
See the Wiring  
3. The control board may be faulty.  
Replace.  
The wire feed speed range is only 1. The 83%wire feed speed dual 1. Turn off the 83% procedure  
50 to 600 IPM.(1.3 to 15.3 m/min)  
procedures switch is activated  
with the high speed gear in  
place.  
switch to return to the full wire  
feed speed range.  
2. Check the wiring between the  
procedure switch and the  
Control Board. See the wiring  
diagram.  
3. The Control Board may be  
faulty. Replace.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-7  
F-7  
TROUBLESHOOTING & REPAIR  
TROUBLESHOOTING GUIDE  
Observe Safety Guidelines  
detailed in the beginning of this manual.  
PROBLEMS  
(SYMPTOMS)  
POSSIBLE AREAS OF  
MISADJUSTMENT(S)  
RECOMMENDED  
COURSE OF ACTION  
FEEDING PROBLEMS  
The wire feed motor runs very fast 1. Make sure the LN-15 is operat- 1. Perform the Wire Drive Motor  
and there is no control.  
ing in the CV mode.  
Test.  
2. Make sure the wire speed con-  
trol and procedure switch are  
operating correctly. See the  
wiring diagram  
2. Perform the Hall Effect Module  
Test.  
3. The Control Board may be faulty.  
Replace.  
The wire feed speed varies during 1. The drive rolls may be slipping 1. Perform the Wire Drive Motor  
welding but the meter reading  
causing feeding problems.  
Test.  
remains constant.  
2. The LN-15 may be in the  
Constant Current mode. Verify  
on power-up that the LN-15 is  
set for Constant Voltage weld-  
ing.  
2. Perform the Hall Effect Module  
Test.  
3. Reduce the spindle brake resis-  
tance.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-8  
F-8  
TROUBLESHOOTING & REPAIR  
TROUBLESHOOTING GUIDE  
Observe Safety Guidelines  
detailed in the beginning of this manual.  
PROBLEMS  
(SYMPTOMS)  
POSSIBLE AREAS OF  
MISADJUSTMENT(S)  
RECOMMENDED  
COURSE OF ACTION  
WELDING PROBLEMS  
No shielding gas.  
1. Make sure the gas supply is ade- 1. If the gas solenoid is not operat-  
quate and the gas hoses are not  
loose or kinked.  
ing perform the Gas Solenoid  
Test.  
2. The Control Board may be faulty.  
The shielding gas turns on sporad- 1. The pressure in the gas line may 1. Perform the Gas Solenoid Test.  
ically, or remains on all the time. have exceeded 80psi (5.5 bar)  
2. The Control Board may be faulty.  
The Display board shows “POS” 1. The LN-15 is in the “Press and 1. The Control board may be faulty.  
“PRE” or “BRN”.  
Spin” set-up mode.  
2. The Display Board may be faulty.  
2. One of the dip switches on the  
control board is set to “ON” for  
the timer setting mode.  
1. The part being welded may be  
wet or very dirty.  
There is porosity in the weld.  
2. The electrode being used may  
be wet or rusty.  
3. The shielding gas may be wrong  
for the process.  
4. There may not be enough shield-  
ing gas.  
5. Make sure the wire feed speed  
and arc voltage are correct for  
the process.  
The welding arc burns back to the 1. Check the wire feeding path for 1. Perform the Wire Drive Motor  
tip. mechanical restrictions, Test.  
2. Make sure the polarity is correct 2. Perform the Hall Effect Module  
for the process.  
Test.  
3. The contact tip may be worn.  
4. The welding voltage may be set  
too high or the wire feed speed  
set too low.  
5. Check the wire drive tension.  
CAUTION  
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-  
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call  
1-888-935-3877.  
LN-15  
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F-9  
F-9  
TROUBLESHOOTING & REPAIR  
DESCRIPTION/  
DEFINITION  
RESOLUTION  
FAULT CODES  
Average motor over cur-  
rent shutdown  
•
•
The wire drive motor has overheated.  
0081  
Check to make sure the electrode  
slides easily through the liner of the  
gun.  
•
•
Reduce the spindle brake resistance.  
Reduce the amount of tension in the  
wire drive tension arm.  
•
•
For the best results, use only Lincoln  
electrodes.  
Wait 10 minutes for the wire feeder to  
cool.  
•
Verify that nothing is jammed in the  
wire drive or gears.  
Locked rotor condition  
on the wire drive motor.  
0082  
•
The ripple of the power source OCV  
is too high, greater than 110V.  
(Across the Arc Models only)  
Verify that the power source is  
reconnected for the proper input  
voltage.  
Repair or replace the power source.  
The power source does not conform  
to NEMA.  
Trigger lockout.  
0086  
•
•
NOTE: If more than one fault message is being displayed, perform all the checks for the faults  
before replacing the printed circuit board  
LN-15  
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F-10  
F-10  
NOTES  
LN-15  
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F-11  
F-11  
TROUBLESHOOTING & REPAIR  
BOOST POWER BOARD TEST  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will determine if the correct input voltage is being applied to the Boost  
Power Board and if the correct output voltage is being produced by the Boost Power  
Board.  
MATERIALS NEEDED  
Volt/Ohm Meter  
DC Voltage Source (15 to 110 VDC)  
LN-15  
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F-12  
F-12  
TROUBLESHOOTING & REPAIR  
BOOST POWER BOARD TEST (continued)  
TEST PROCEDURE  
6. Check for approximately 80 VDC at leads 501(+) to  
1. Remove input power to the LN-15.  
502(-) . See Figure F.3.  
2. Perform the Cover and Spindle Mount removal  
7. Check for approximately 80 VDC at leads labeled  
procedure.  
POS to NEG. See Figure F.3.  
3. Locate the Boost Power Board. See Figure F.1.  
8. If the correct input voltage is present in step 5 and  
either of the voltages in steps 6 or 7 are not present  
the Boost Power Board is faulty. Replace.  
4. Apply the correct DC voltage to the LN-15 (15-110  
VDC).  
5. Check for the correct input voltage to the Boost  
Power Board at leads 526A (+) to 527A(-) (15-110  
VDC). See Figure F.3. If the input voltage is not  
present check the input rectifier bridge and associ-  
iated circuits. See the wiring diagram.  
FIGURE F.1 – BOOST POWER BOARD LOCATION  
BOOST POWER BOARD  
LN-15  
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F-13  
F-13  
TROUBLESHOOTING & REPAIR  
BOOST POWER BOARD TEST (continued)  
FIGURE F.2 – BOOST POWER BOARD  
+
-
+
-
C9  
C10  
J47  
R71  
R2  
R1  
R72  
FIGURE F.3 – PLUG J47 LEAD LOCATIONS  
526A  
Neg.  
Pos.  
527A  
501  
502  
LN-15  
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F-14  
F-14  
NOTES  
LN-15  
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F-15  
F-15  
TROUBLESHOOTING AND REPAIR  
GAS SOLENOID VALVE TEST  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This test will determine if the gas solenoid valve is functional.  
MATERIALS NEEDED  
12 VDC Supply  
Volt/Ohmmeter  
DC Voltage Source (15 to 110 VDC)  
LN-15  
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F-16  
F-16  
TROUBLESHOOTING AND REPAIR  
GAS SOLENOID VALVE TEST  
(continued)  
FIGURE F.4 – LEADS 552 & 553  
LEADS 552 &553  
GAS SOLENOID  
TEST PROCEDURE  
6. If the solenoid does not activate and  
1. Remove power to the LN-15 machine.  
allow gas to flow, then the solenoid is  
faulty. Replace.  
2. Perform the Cover and Spindle  
Mount removal procedure.  
7. The normal solenoid resistance is  
approximately 20 to 21 ohms.  
3. Locate and remove the two solenoid  
leads 552 & 553 from the solenoid  
valve. See Figure F.4.  
8. Normal voltage (with gun trigger  
activated) measured at the solenoid  
is 6.5 VDC (leads 552 & 553).  
4. Make sure the gas supply for the  
solenoid is hooked up, and then apply  
12 VDC to the gas solenoid.  
9. If the voltage is not present at leads  
552 & 553 the feed head control  
board may be faulty.  
5. If the solenoid activates and allows  
gas flow, then the solenoid valve is  
good.  
NOTE: There should not be any gas flow  
until the solenoid is activated.  
LN-15  
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F-17  
F-17  
TROUBLESHOOTING AND REPAIR  
CONTACTOR TEST  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This test will determine if the contactor is functional.  
MATERIALS NEEDED  
12 VDC Supply  
Volt/Ohmmeter  
LN-15  
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F-18  
F-18  
TROUBLESHOOTING AND REPAIR  
CONTACTOR TEST  
(continued)  
FIGURE F.5 – CONTACTOR  
LEADS 507 & 578 (blue)  
LARGE TERMINAL  
STUDS  
6. If the contactor activates when the 12  
VDC is applied, check the resistance  
between the two large terminal studs  
with the contactor activated. The  
resistance should be very low (0 to  
1 ohm).  
TEST PROCEDURE  
1. Remove input power to the LN-15.  
2. Perform the Wire Drive Assembly  
removal procedure.  
3. Locate the contactor and leads 507  
and 578 (blue) and separate the two  
in line connectors. See Figure F.5.  
7. If the resistance is “high” or “open”  
between the two large terminal studs  
when the contactor is activated, the  
contactor is faulty. Replace.  
4. Apply 12 VDC to the contactor coil  
leads.  
8. If the contactor activates and the  
resistance between the terminals is  
low when the 12 VDC is applied, the  
contactor is good.  
CAUTION  
Do not leave the 12 VDC applied to the  
contactor coil for a prolonged period of  
time (15 seconds maximum). Damage to  
contactor may result.  
NOTE: When the contactor is not activated,  
the resistance between the terminals  
should be very high (infinite). If the  
resistance is always low, the  
contacts are “stuck” and the  
contactor is faulty. Replace.  
5. If the contactor does not activate  
when the 12 VDC is applied, the  
contactor is faulty. Replace.  
Note: The normal contactor coil resistance  
is approximately 4.4 ohms.  
LN-15  
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F-19  
F-19  
TROUBLESHOOTING AND REPAIR  
DRIVE MOTOR TEST  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This test will determine if the Wire Drive Motor is functioning properly.  
MATERIALS NEEDED  
Voltage Source (variable 3 to 26 VDC)  
Volt/Ohmmeter  
LN-15  
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F-20  
F-20  
TROUBLESHOOTING AND REPAIR  
DRIVE MOTOR TEST (Continued)  
Figure F.6- Motor Leads  
LEADS  
550 & 551  
6. When the supply voltage is varied  
from 3 to 26 VDC, the drive motor  
speed (RPM) should vary accordingly.  
If the motor does not run or vary in  
speed, the motor, gearbox or motor  
brushes may be faulty. Check or  
replace.  
TEST PROCEDURE  
1. Remove the input power to the LN-15.  
2. Perform the Wire Drive Assembly  
Removal procedure.  
3. Locate the Positive lead 550 (white)  
and disconnect from motor. Note pin  
location for reassembly. See Figure  
F.6.  
7. Check the resistance between each  
of the motor leads and the motor  
case. The resistance should be very  
high (at least 500,000 ohms). If the  
resistance is low, the motor is  
grounded to the motor case and  
should be replaced.  
4. Locate the Negative lead 551 (gray)  
and disconnect from motor. Note pin  
location for reassembly. See  
Figure F.6.  
5. Apply a variable DC voltage to the  
drive motor from lead 550(white)(+) to  
lead 551(gray)(-).  
LN-15  
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F-21  
F-21  
TROUBLESHOOTING AND REPAIR  
HALL EFFECT MODULE TEST  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This test will determine if the Hall Effect Module is functioning properly.  
MATERIALS NEEDED  
Voltage Source (variable 15 to 110 VDC)  
Volt/Ohmmeter  
LN-15  
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F-22  
F-22  
TROUBLESHOOTING AND REPAIR  
HALL EFFECT MODULE TEST (Continued)  
Figure F.7 - PLUG J2 LEAD LOCATION  
Blue  
Red  
(562)  
(563)  
Black  
(561)  
This value can also be measured  
using a frequency counter  
TEST PROCEDURE  
1. Remove the input power to the LN-15.  
50 in./min. = 120 HZ  
2. Perform the Wire Drive Assembly  
700 in./min. = 1.6 KHZ  
Removal procedure.  
7. If the above voltage reading is not  
correct, the Hall Effect device may be  
faulty.  
3. Locate the three Hall Effect leads at  
Plug J2. See Figure F7.  
4. Apply at least 15VDC but no more  
than 115VDC to the LN-15 from the  
electrode cable to the work sensing  
lead.  
5. Check for the presence of 5VDC from  
lead 563 (Red+) to lead 561 (Black-).  
If the 5VDC is not present or low, the  
feed head control board may be  
faulty.  
6. Activate the LN-15 trigger circuit,  
make sure the drive motor is running  
and check for the presence of  
approximately 2.8VDC from lead 562  
(Red+) to lead 561 (Black-). The  
value of 2.8VDC represents the  
correct feedback voltage from the Hall  
Effect device to the control board.  
LN-15  
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F-23  
F-23  
TROUBLESHOOTING AND REPAIR  
CONTACTOR REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the contactor.  
MATERIALS NEEDED  
7/16” Wrench  
3/4” Wrench  
11/16” Wrench  
Screwdriver  
LN-15  
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F-24  
F-24  
TROUBLESHOOTING AND REPAIR  
CONTACTOR REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.8 - CONTACTOR LEAD LOCATION  
Divider Plate  
7/16" Bolts  
Welding Cable  
Copper Bus Bar  
Leads 567 & 567A  
3/4" Nut  
REMOVAL PROCEDURE  
9. Carefully remove the contactor  
assembly from the LN-15.  
1. Remove the input power to the LN-15.  
2. Perform the Roll Cage Removal  
10. Using the 11/16” wrench remove the  
cable and copper bus bar from the  
contactor.  
Procedure.  
3. Perform the Wire Drive Assembly  
Removal procedure.  
11. The contactor may now be removed  
by using the screwdriver to remove  
the four screws mounting the  
contactor to the mounting plate.  
4. Remove the two rubber roll cage  
mounts that hold the contactor  
assembly to the case bottom.  
5. Using the 3/4” wrench remove the  
welding cable from the contactor  
assembly stud. See Figure F.8. Also  
leads 567 & 567A.  
6. Disconnect the two coil leads at their  
in line connectors.  
7. Disconnect and clear ground leads  
as necessary.  
8. Using the 7/16” wrench remove the  
two bolts mounting the contactor  
assembly to the divider plate. See  
Figure F.8.  
LN-15  
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F-25  
F-25  
TROUBLESHOOTING AND REPAIR  
CONTACTOR REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
REPLACEMENT PROCEDURE  
6. Connect the two coil leads.  
1. Install the new contactor using the  
four screws previously removed.  
7. Connect all group leads previously  
removed.  
2. Replace the copper bus bar and cable.  
8. Using the 3/4” wrench replace the  
welding cable and lead 567 and 567A.  
3. Install the the contactor assembly into  
the case.  
9. Replace the wire drive assembly.  
10. Replace the roll cage.  
4. Using the 7/16” wrench mount the  
contactor assembly to the divider  
plate.  
5. Install the two rubber mounts  
previously removed.  
LN-15  
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F-26  
F-26  
NOTES  
LN-15  
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F-27  
F-27  
TROUBLESHOOTING AND REPAIR  
FEED HEAD CONTROL BOARD  
REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the Feed head  
Control Board.  
MATERIALS NEEDED  
3/8” Wrench  
LN-15  
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F-28  
F-28  
TROUBLESHOOTING AND REPAIR  
FEED HEAD CONTROL BOARD  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.9 - FEED HEAD CONTROL BOARD LOCATION  
FEEDHEAD CONTROL BOARD  
REMOVAL PROCEDURE  
REPLACEMENT PROCEDURE  
1. Remove input power to the LN-15.  
1. Set the new Feed head Control Board  
on the four mounting studs.  
2. Perform the Cover and Spindle  
Mount Removal Procedure.  
2. Secure with the four nuts previously  
removed.  
3. Locate the Feed head Control Board.  
and plugs J81, J82, J83, J84, J85, J86  
and J88. See Figure F.9 & See Figure  
F.10.  
3. Replace the seven plugs previously  
removed. See Figure F.10.  
4. Replace the Cover and Spindle mount.  
4. Remove the seven plugs from the  
board taking note of placement for  
reassembly.  
5. Using the 3/8” wrench remove the four  
nuts holding the board in place.  
6. Carefully remove the Feed head  
Control Board.  
LN-15  
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F-29  
F-29  
TROUBLESHOOTING AND REPAIR  
FEED HEAD CONTROL BOARD  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.10 - FEED HEAD CONTROL BOARD  
3/8" Mounting  
Nuts  
J81  
J88  
J82  
J83  
J84  
J85  
J86  
3/8" Mounting  
Nuts  
LN-15  
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F-30  
F-30  
NOTES  
LN-15  
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F-31  
F-31  
TROUBLESHOOTING AND REPAIR  
BOOST POWER SUPPLY BOARD  
REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the Boost Power  
Supply Board.  
MATERIALS NEEDED  
3/8” Wrench  
LN-15  
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F-32  
F-32  
TROUBLESHOOTING AND REPAIR  
BOOST POWER SUPPLY BOARD  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.11 - BOOST POWER BOARD LOCATION  
BOOST POWER BOARD  
REMOVAL PROCEDURE  
REPLACEMENT PROCEDURE  
1. Remove input power to the LN-15.  
1. Set the new Board on the mounting  
studs.  
2. Perform the Cover and Spindle  
Mount Removal Procedure.  
2. Secure with the three nuts previously  
removed.  
3. Locate the Boost Power Supply Board.  
See Figure F.11.  
3. Replace plug J47 previously removed.  
See Figure F.12.  
4. Disconnect plug J47. See Figure F.12.  
4. Replace the Cover and Spindle mount.  
5. Using the 3/8” wrench remove the  
three nuts holding the board in place.  
6. Carefully remove the Boost Power  
Supply Board.  
LN-15  
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F-33  
F-33  
TROUBLESHOOTING AND REPAIR  
BOOST POWER SUPPLY BOARD  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.12 - BOOST POWER BOARD PLUG/MOUNT LOCATION  
3/8" Mounting  
Nut  
+
-
+
-
C9  
C10  
J47  
R71  
R2  
R1  
R72  
3/8" Mounting  
Nuts  
LN-15  
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F-34  
F-34  
NOTES  
LN-15  
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F-35  
F-35  
TROUBLESHOOTING AND REPAIR  
WIRE DRIVE ASSEMBLY  
REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the Wire Drive  
Assembly.  
MATERIALS NEEDED  
3/8” Wrench  
3/4” Wrench  
Screwdriver  
Small Pliers  
LN-15  
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F-36  
F-36  
TROUBLESHOOTING AND REPAIR  
WIRE DRIVE ASSEMBLY  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.13 - WIRE DRIVE MOUNTING SCREW LOCATION  
MOUNTING SCREWS  
REMOVAL PROCEDURE  
1. Remove input power to the LN-15.  
2. Open door.  
REPLACEMENT PROCEDURE  
1. Connect previously removed plug J2  
to the new conductor block.  
2. Replace lead 67 into the conductor  
block.  
3. Remove the four screws mounting the  
wire drive assembly to the case. See  
Figure F.13.  
3. Replace the cable onto the conductor  
block.  
4. Using small pliers disconnect the gas  
hose from the conductor block.  
4. Replace the gas hose onto the  
conductor block.  
5. Carefully maneuver the drive assembly  
out of the case.  
5. Carefully maneuver the Wire Drive  
Assembly into the case.  
6. Using the 3/4” wrench remove the  
cable from the conductor block.  
6. Secure assembly to machine using the  
four previously removed screws.  
7. Remove lead 67 from the conductor  
block. See Wiring Diagram.  
8. Remove plug J2.  
LN-15  
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F-37  
F-37  
TROUBLESHOOTING AND REPAIR  
COVER AND SPINDLE MOUNT  
REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the Cover and  
Spindle Mount Assembly.  
MATERIALS NEEDED  
3/8” Wrench  
1/2” Wrench  
Large Pliers  
LN-15  
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F-38  
F-38  
TROUBLESHOOTING AND REPAIR  
COVER AND SPINDLE MOUNT  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.14 - COVER AND SPINDLE MOUNT LOCATION  
Cord Grip Nut  
Spindle Mount  
Cover  
REMOVAL PROCEDURE  
8. Disconnect the gas hose from the  
conductor block on the Wire Drive  
Assembly.  
1. Remove input power to the LN-15.  
2. Open door.  
3. Locate the spindle mount and cover  
assembly. See Figure F.14.  
9. Carefully remove the cover and spindle  
assembly from the case. Be careful  
not to damage the switches, leads or  
solenoid.  
4. Using the 1/2” wrench remove the one  
bolt from the top of the cover.  
10. If complete removal is necessary  
disconnect the leads from the  
switches and solenoid. Be sure to  
label for reassembly.  
5. Using the 3/8” wrench remove the five  
mounting screws. See Figure F.15.  
6. Using the large pliers loosen and  
remove the cord grip nut. See Figure  
F.14.  
7. Pull the electrode cable inward through  
the rear case.  
LN-15  
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F-39  
F-39  
TROUBLESHOOTING AND REPAIR  
COVER AND SPINDLE MOUNT  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.15 - COVER AND SPINDLE MOUNT SCREW LOCATION  
1/2" Bolt  
REPLACEMENT PROCEDURE  
1. Replace all leads to switches and  
solenoid.  
2. Maneuver assembly into case.  
3. Connect gas hose to conductor block.  
4. Replace five mounting screws.  
5. Replace bolt into top of case.  
6. Replace the electrode cable into the  
cord grip. Replace and tighten the nut.  
LN-15  
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F-40  
F-40  
NOTES  
LN-15  
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F-41  
F-41  
TROUBLESHOOTING AND REPAIR  
ROLL CAGE  
REMOVAL AND REPLACEMENT PROCEDURE  
WARNING  
Service and repair should be performed by only Lincoln Electric factory trained  
personnel. Unauthorized repairs performed on this equipment may result in danger  
to the technician or machine operator and will invalidate your factory warranty. For  
your safety and to avoid electrical shock, please observe all safety notes and pre-  
cautions detailed throughout this manual.  
If for any reason you do not understand the test procedures or are unable to per-  
form the test / repairs safely, contact the Lincoln Electric Service Department for  
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.  
TEST DESCRIPTION  
This procedure will aid the technician in the removal and replacement of the Roll Cage.  
MATERIALS NEEDED  
7/16” Wrench  
LN-15  
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F-42  
F-42  
TROUBLESHOOTING AND REPAIR  
ROLL CAGE  
REMOVAL AND REPLACEMENT PROCEDURE (Continued)  
Figure F.16 - ROLL CAGE BOLT LOCATION  
1/2" Bolt  
7/16" Bolts  
REMOVAL PROCEDURE  
1. Remove input power to the LN-15.  
2. Using a 7/16” Wrench remove the five  
bolts securing the roll cage to the LN-  
15 case.  
3. Carefully remove the roll cage.  
LN-15  
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F-43  
F-43  
TROUBLESHOOTING AND REPAIR  
RETEST AFTER REPAIR  
If a failed test indicates that any mechanical part that could affect the machine’s electri-  
cal characteristics must be replaced or if any electrical components are repaired of  
replaced, the machine must be retested and meet the following standards.  
Wire Feed Speed...................................... 50 thru 700 inches per minute  
Gas Solenoid............................................. Must operate when gun trigger is activated  
Contactor................................................... Must operate when gun trigger is activated  
LN-15  
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F-44  
F-44  
NOTES  
LN-15  
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Section G-1  
Section G-1  
TABLE OF CONTENTS  
- ELECTRICAL DIAGRAMS SECTION -  
Electrical Diagrams ...............................................................................................Section G  
Wiring Diagram (L11436-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-2  
Entire Machine Schematic (G4198-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-3  
Boost PC Board Schematic (L11818-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-4  
Boost PC Board Assembly (M19753-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*G-5  
Feedhead PC Board Schematic (G3883-1E0/1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-6  
Feedhead PC Board Schematic (G3883-1E0/2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-7  
Feedhead PC Board Assembly (G3884-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*G-8  
SPI Display PC Board Schematic (L11756-1E1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-9  
SPI Display PC Board Assembly (L11757-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .G-10  
* NOTE: Many PC Board Assemblies are now totally encapsulated and are therefore consid-  
ered to be unserviceable. The Assembly drawings are provided for reference only.  
LN-15  
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G-2  
G-2  
ELECTRICAL DIAGRAMS  
WIRING DIAGRAM - ENTIRE MACHINE - (L11436-1)  
1
4 1 3 6 - L 1  
RELEASED A.02 FROM "X"  
CHANGE DETAIL:  
ENGINEERING CONTROLLED  
MANUFACTURER: No  
LN-15 ACROSS THE ARC MODEL  
GENERAL INFORMATION  
CAVITY NUMBERING SEQUENCE  
(COMPONENT SIDE OF P.C. BOARD)  
ELECTRICAL SYMBOLS PER E1537  
1
1
3
6
1
2
4
8
COLOR CODE  
N.A.  
J83,J88  
J81,J82  
J2,J47,J84  
B -  
W -  
R -  
U -  
BLACK  
WHITE  
RED  
5
4
3
4
POWER SUPPLY P.C. BOARD  
J47  
1
1
8
5
BLUE  
J1,J86  
J85,J87  
10  
16  
9
6
1
5
6
8
2
3
7
4
NEG 501  
POS  
CONTROL P.C. BOARD  
527A  
1
2
3
4
5
6
1
2
3
4
21A  
KEYING PLUG  
526A  
502  
501  
150V, 300J  
J81  
J82  
502  
501  
526  
N.C.  
ON / OFF SWITCH  
526B  
J88  
67  
578  
1
2
3
4
MOV ASBLY  
N.B.  
526C  
NEG  
L6  
N.A.  
S3  
J2  
1
550  
551  
552  
553  
507  
POS  
1
2
3
4
5
6
2
3
BAFFLE  
552  
553  
GAS  
SOLENOID  
MOUNTED  
RECTIFIER  
DIODE  
J83  
21A  
4
5
BRIDGE  
6
7
8
526C  
L3  
B
L1  
W
B
-
W
B
R
563  
561  
575  
576  
U
1
2
3
4
5
6
7
8
J87  
21B  
TACH.  
R
MOTOR /  
GEARBOX  
527  
J84  
L4  
567  
9
1
5
6
7
8
10 11  
12  
2
3
4
13 14  
15  
U
B
562  
577  
MOV ASBLY  
320V, 150J  
320V, 150J  
J85  
J86  
67  
L2  
GND-A  
L5  
9
1112  
13  
9
8
10  
1
5
6
7
8
10  
1
5
6
7
2
3
2
3
4
4
1415  
16  
.0047/.005 mF,  
1400VDC  
CONTACTOR  
FEED  
PLATE  
556  
554  
507  
WIRE FEED  
SPEED  
CONTROL  
555  
587  
589  
GND-B  
1M W  
559  
POTENTIOMETER  
558  
512  
N.C.  
577  
576  
575  
GND-D  
1
2
3
10K2W  
578  
SHIELDED CABLE  
DRAIN LEAD  
N.B.  
GND-C  
J3  
A
TRIGGER  
INPUT  
556  
B
C
D
E
554  
555  
TO  
WORK  
9
10  
1
5
6
7
8
2
3
4
21  
83%  
PROCEDURE  
INPUT  
554A  
567A  
DISPLAY P.C. BOARD  
J1  
567  
TRIGGER  
CONNECTOR  
2-STEP  
TRIGGER  
INTERLOCK  
INPUT ELECTRODE  
CABLE CONNECTION  
N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROMCOMPONENT SIDE OF BOARD.  
N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF CONNECTOR.  
N.C. TOGGLESWITCHES AND POTENTIOMETERS SHOWN FROMCONNECTIONSIDE OF SWITCH.  
COLD INCH/  
GAS PURGE  
N.C.  
N.C.  
589  
587  
558  
S1  
512  
559  
S2  
A
L11436-1  
CLEVELAND, OHIO U.S.A.  
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OWNED BY LINCOLN GLOBAL, INC. AND MAY NOT BE DUPLICATED, COMMUNICATED  
TO OTHER PARTIES OR USED FOR ANY PURPOSE WITHOUT THE EXPRESS WRITTEN PERMISSION OF LINCOLN GLOBAL, INC.  
PROPRIETARY & CONFIDENTIAL:  
UNLESS OTHERWISE SPECIFIED TOLERANCE  
DESIGN INFORMATION  
REFERENCE:  
MANUFACTURING TOLERANCE PER E2056  
EQUIPMENT TYPE:  
SUBJECT:  
1
PAGE _1__ OF ___  
SEMI-AUTOMATIC WIRE FEEDER  
ON 2 PLACE DECIMALS IS ± .02  
TJP/KJ  
DRAWN BY:  
L11436  
ON 3 PLACE DECIMALS IS ± .002  
DOCUMENT  
DOCUMENT  
NUMBER:  
ON ALL ANGLES IS ± .5 OF A DEGREE  
LN-15 WIRING DIAGRAM ACROSS THE ARC  
REVISION:  
MATERIAL TOLERANCE (" ") TO AGREE  
t
ENGINEER: E. ENYEDY  
SCALE:  
WITH PUBLISHED STANDARDS.  
MATERIAL  
APPROVAL  
DATE:  
PROJECT  
NUMBER:  
L11436-1  
A
CRM35166  
NA  
APPROVED:  
1:1  
5/23/03  
DISPOSITION:  
DO NOT SCALE THIS DRAWING  
STRP  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-3  
G-3  
ELECTRICAL DIAGRAMS  
SCHEMATIC - ENTIRE MACHINE - (G4198-1)  
1 8 - 1 9 G 4  
RELEASED A.03 FROM "X"  
ENGINEERING CONTROLLED  
MANUFACTURER: No  
GENERAL INFORMATION  
ELECTRICAL SYMBOLS PER E1537  
COLOR CODE  
CAVITY NUMBERING SEQUENCE  
General Notes:  
(COMPONENT SIDE OF P.C. BOARD)  
x
Codes 10864,11033 & 11035 do not support the high/low speed gear  
change. Only the high speed (1.8" diameter) gear may be used.  
1
1
3
6
4
8
1
2
J83,J88  
J81,J82  
J2,J47,J84  
B -  
W -  
R -  
U -  
BLACK  
WHITE  
RED  
LN-15 ACROSS THE ARC MODEL  
5
4
3
4
1
8
Error  
Description  
Cause and Remedy  
1
5
BLUE  
Code  
Gas Solenoid  
Circuit  
J1,J86  
J85,J87  
Err 0081  
Average  
motor Over-  
current  
The wire drive has exceeded the current rating:  
10 amps for 0.5 seconds or  
3.5 amps for 10 seconds.  
Wire Drive  
10  
16  
9
6
ƒ
ƒ
Boost Board  
Circuit  
shutdown  
Wait 45 seconds for the error to reset.  
Reduce the current load on the motor by:  
Verifying the electrode slides easily through the  
liner of the gun.  
ƒ
ƒ
ƒ
Reduce the spindle brake resistance.  
Reduce the amount of tension in the wire drive  
pressure arm.  
FEED HEAD CONTROL  
P.C. BOARD  
INPUT VOLTAGE MONITOR  
(MOTOR FETS ARE BOTH  
OFF WHEN INPUT VOLTAGE  
DROPS BELOW 20V)  
+
Vin  
ƒ
Use only Lincoln electrodes.  
+
MOTOR  
Located on the right  
side of the control box.  
Schematic G3883  
Err 0086 Trigger  
lockout  
The voltage into the feed head board exceeds 150  
VDC.  
SUPPLY  
VOLTAGE MO  
NITOR  
MOTOR  
Schematic M19752  
+5V  
+15V  
- INPUT  
COM  
Common  
J81  
80VDC or weld voltage,  
whichever is higher  
+Vin  
Some inverters and choppers may have spikes on the  
output that charge the capacitors inside the LN-15  
beyond limits. If this error occurs, lower the OCV of  
the power source. It may be likely that a different  
power source is required.  
1
-15V  
ARC VOLTAGE  
FEEDBACK  
to '-' input ISOLATION  
POWER  
SUPPLY  
2
3
4
SWITCH (FET)  
-5V  
+5V(TACH)  
+5V  
J81-4  
J82-4  
J83-5  
enabling  
COM  
FEEDHEAD SUPPLY  
N
I
PUT  
+ motor  
502  
circuit  
1M  
1M  
J88  
501  
J47  
8
67  
4
J83  
78k  
78k  
+
MOTOR SUPPLY  
COM  
7
6
+
-
6
POS  
40k  
Vin  
-
J83-6  
J81-3  
J82-3  
COM  
502  
501  
POS  
NEG  
Boost  
Circuit  
1200uF  
WFS Display  
J82  
3
Voltage Display  
5
4
3
21A  
NEG  
1
4
1
2
COM  
COM  
2
1
COM  
Voltage LED  
+ MOTOR  
+Vin  
SPI DISPLAY  
L11757-1  
BOOST BOARD  
AVERAGE  
CURRENT  
LIMITING  
Positive  
Voltage  
Feedback  
J83  
J88  
The boost board takes the weld voltage  
and boosts it to 80VDC for the rest of  
the LN-15. There are two supplies on  
the boost board, one for the motor and  
the other for the feedhead board. With  
two supplies, even if the motor supply  
should droop because of heavy loads,  
power to the feed head board is not  
affected.  
5
DRIVE  
YELLOW  
PWM  
MOTOR  
CONTROL  
527A  
526A  
CPLD  
BRAKE  
PULSE BY PULSE  
PEAK CURRENT  
LIMIT (27 AMPS)  
PWM  
CONTROL  
FOR  
5
TOROID  
TOROID  
RED  
RED  
RED  
RED  
J2  
CONTACTOR  
J83  
Motor +  
550  
551  
552  
553  
8
7
1
4.5 A PEAK  
CURRENT  
LIMIT  
Motor -  
Gas Solenoid +  
Gas Solenoid -  
see power  
supply section  
molex  
2
The rectifier allows the LN-15 to  
be powered either electrode  
positive or electrode negative  
without any switches for the  
customer to set.  
+15V  
3
552  
553  
ON/OFF  
SWITCH  
This large MOV  
absorbs the  
4
55  
6
21A  
6.5 VDC when gas flowing  
Coil measures 21 ohms  
Not Used  
inductive energy in  
the weld cables and  
power source when  
the contactor  
COM  
MICRO  
CONTROLLER  
The display board communicates tothe feedheadboardthrough the SPI  
bus. Only thepower supply signals canbe monitoredduringservicing.  
526B  
526C  
Measure B to U  
120 Hz @ 50 in/min  
1.6 kHz @ 700 in/min  
Located under the cover at  
the rear of the feeder  
gas  
W
B
solenoid  
PWM control  
ckts  
opens.  
+5V (TACH)  
J84  
GAS  
SOLENOID  
15 VDC Tach Supply  
Located under the cover  
in the controlbox ably.  
150V, 300J  
1
563  
The WFS awl ays shows the present WFS.  
MOTOR /  
1
2
3
GEARBOX  
2
3
2.6 VDC @ 50 in/min  
27.4 VDC @ 700 in/min  
8 sec average Current  
limit = 3.5 Amps  
The voltagedisplay shows the voltage whilewelding, plus hodl s the  
voltagefor 5 secondsafter the weld. It shows "-- -" when idle. A negative  
"-" sign will automaticalyl be shown whenwelding with reverse poalrity  
procedures.  
BRIDGE  
RECTIFIER  
INPUT  
TACH  
Tach Signal  
Tach COM  
R
562  
561  
7
526  
TACH.  
MOV ASBLY  
4
5
U
B
4
Located in the control box next  
to the Feedhead board.  
526B  
Wiper to COM  
5 VDC at 700 ipm  
0 VDC at 50 ipm  
(Limit is software set)  
COM  
COM  
Input  
Power  
Circuit  
WFS  
ANALOG  
INPUT  
6
TOROID  
10K Ohms  
3-1/2 turns  
WIRE FEED SPEED  
CONTROL  
POTENTIOMETER  
J84  
8
6
Located behind the insulating  
wire drive panel. Remove the  
wire drive ably ot gainaccess.  
All the LEDs, including those not used, will briefly light on power up. The  
LED's not used are visible behind the nameplate when lit.  
POT Supply  
Wiper  
576  
526C  
577  
Access this connector  
by removingthe wire  
drive asbly.  
A=1  
1
2
3
5V  
+
-
COM  
575  
TOROID  
5
Located on the case  
front. Remove the wire  
drive asbly to gain  
A=1  
15- 110 VDC  
MOV ASBLY  
21B  
INTERNAL  
SWITCH  
INPUTS  
SPI  
CKTS  
GND-B  
2k  
EXTERNAL  
SWITCH  
INPUTS  
access.  
Not a PC board; no schematic.  
527  
N.C.  
+15V  
COM  
2k  
567  
Located behind the wire drive  
2k  
67  
FEEDPLATE  
4.75k  
COM  
4.75k  
500  
GND-A  
1M ohms  
COM  
500  
500  
TOROID  
4.75k  
320V, 150J  
320V, 150J  
For programming at LECo factory only.  
Not field reprogrammable.  
4.75k  
+15V  
4.75k  
4.75k  
J87  
J86  
9
5
6
8
10  
11  
7
14  
12  
13  
15  
1
2
3
J85  
4
9
1
5
6
7
8
10  
9
2
3
1
5
6
7
8
10 11  
12 13 14  
15  
4
.0047/.005 mfd,  
1400VDC  
GND-C  
2
3
4
The contactor is  
locatedbehind  
the glastic panel  
next tothe motor.  
567A  
558  
512  
559  
554  
555  
556  
Bussbar from input  
stud tocontactor  
21  
Trigger  
Pigt
TRIGGER  
CONNECTOR  
15 VDC when Trigger and 83%  
Switch Open  
9 VDC when Trigger Open, 83%  
Switch Closed  
0 VDC when Trigger Closed  
589  
587  
Located on the lower left  
of the front of the case.  
Input  
Voltage  
15-110 VDC from  
welding power  
source  
J3  
A
GUN  
TRIGGER  
INPUT  
83%  
PROCEDURE  
INPUT  
CONTACTOR  
556  
554  
2-STEP  
TRIGGER  
INTERLOCK  
300A 60%  
B
C
D
E
250A 100%  
2 Step Trigger  
15 VDC for 2 Step  
0 VDC for Interlock  
Coil measures 4.4 ohms.  
578  
SHIELDED CABLE  
DRAIN LEAD  
555  
0 VDC Open  
2.3 VDC Closed  
12 VDC coil  
PWM Controlled  
Protection  
554A  
507  
83% Procedure Input  
0 VDC Normal  
9 VDC 83% switch Closed  
and Trigger Open  
589  
587  
INPUT ELECTRODE  
CABLE CONNECTION  
S2  
The 83% procedure reduces the  
WFS to 83% of the set point, but  
no less than 50 in/min. It is used  
most often when pipe welding.  
All LED’s light  
briefly  
WFS  
Control  
Circuit  
WORK  
CLIP  
Gas Purge  
15 VDC when Purge OFF  
0 VDC when Purge ON  
N.A.  
COLD INCH/  
GAS PURGE  
9
1
5
6
8
10  
2
3
4
7
J1  
558 (BLK)  
512  
DISPLAY P.C. BOARD  
Schematic L11756-x  
S1  
Show CC/CV  
mode and HI/LO  
gear  
559 (RED)  
Cold Inch  
15 VDC when Inch OFF  
0 VDC when Inch ON  
N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROM COMPONENT SIDE OF BOARD.  
N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF CONNECTOR.  
N.C. TOGGLE SWITCHES AND POTENTIOMETERS SHOWN FROM CONNECTION SIDE OF SWITCH.  
Contactor  
Interlock  
Circuit  
Display  
Board  
Circuit  
Model  
Ranger 8,9  
Classic  
Ranger 250, 305  
Commander 300,400,500  
(Common Analog  
Controls)  
V350  
(Common Digital  
Controls)  
DC-400, 600  
Square Wave TIG  
300/355  
Miller Inverters  
STT II  
Note:  
Most semiautomatic  
wire welding  
processes perform  
better using constant  
voltage power sources.  
Be sure the proper  
power source is used  
for your application.  
Contactor life may be  
shortened in  
applications using CC  
machines with high  
OCV.  
Gun Trigger  
Circuit  
Enter Press and  
Spin Mode  
K1870-1,-2 Across  
the Arc  
ƒ
Recommended  
all CV operation.  
ƒ
Recommended for CV  
operation. (Wire  
Feed Module  
ƒ
Recommended for CV  
operation.  
ƒ
Recommended for  
CV operation.  
ƒ
Recommended  
for CVand CC  
operation.  
ƒ
Not recommended  
for CCoperation  
because the  
ƒ
Recommende  
d for CV  
voltage sense  
operation.  
ƒ
Not  
Inch/Purge  
Circuit  
recommended  
for STT  
operation.  
Required)  
customer may  
experience short  
contactor life from  
inductive nature of  
the power source.  
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OWNED BY LINCOLN GLOBAL, INC. AND MAY NOT BE DUPLICATED, COMMUNICATED  
TO OTHER PARTIES OR USED FOR ANY PURPOSE WITHOUT THE EXPRESS WRITTEN PERMISSION OF LINCOLN GLOBAL, INC.  
PROPRIETARY & CONFIDENTIAL:  
Idle:  
UNLESS OTHERWISE SPECIFIED TOLERANCE  
DESIGN INFORMATION  
REFERENCE:  
Display WFS, “---”  
Wire Drive: OFF  
Gas Solenoid: OFF  
MANUFACTURING TOLERANCE PER E2056  
EQUIPMENT TYPE:  
SUBJECT:  
PAGE _1__ OF ___  
1
LN-15 (ACROSS THE ARC)  
MACHINE SCHEMATIC  
ON 2 PLACE DECIMALS IS ± .02  
E. ENYEDY/KJ  
DRAWN BY:  
G4198  
ON 3 PLACE DECIMALS IS ± .002  
DOCUMENT  
DOCUMENT  
NUMBER:  
ON ALL ANGLES IS ± .5 OF A DEGREE  
REVISION:  
MATERIAL TOLERANCE (" ") TO AGREE  
t
ENGINEER: E. ENYEDY  
APPROVED:  
SCALE:  
ƒ
WITH PUBLISHED STANDARDS.  
MATERIAL  
APPROVAL  
DATE:  
PROJECT  
G4198-1  
CRM35166  
NUMBER:  
A
05/27/2003  
NA  
NONE  
DISPOSITION:  
DO NOT SCALE THIS DRAWING  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-4  
G-4  
ELECTRICAL DIAGRAMS  
SCHEMATIC - BOOST PC BOARD - (L11818-2)  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-5  
G-5  
ELECTRICAL DIAGRAMS  
PC BOARD ASSEMBLY - BOOST - (M19753-2)  
2 - 5 7 3 9 M 1  
CHANGE DETAIL: REVISED ITEM 4 WASHER  
ENGINEERING CONTROLLED  
MANUFACTURER: No  
ITEM  
REQ'D  
2
4
1
2
2
2
3
1
1
5
1
2
2
1
5
1
1
1
3
4
2
1
2
1
2
1
1
3
3
1
2
6
1
1
1
4
1
1
1
1
1
2
1
1
PART NO.  
S13490-173  
S16668-11  
S16668-2  
DESCRIPTION  
C1,C11  
C3,C7,C14,C28  
C4  
C5,C6  
C8,C12  
C9,C10  
C21,C26,C29  
C24  
CAPACITOR,PEMF,1.0,63V,10%  
CAPACITOR,CEMO,0.1, 50V,10%  
CAPACITOR,CEMO,47P, 100V,5%  
CAPACITOR,CEMO,4700P, 50V,2%  
CAPACITOR,ALEL,82,35V,20%,LOW-ESR  
CAPACITOR,ALEL,1200,160V,20%  
CAPACITOR,CEMO,.022,50V,20%  
CAPACITOR,CD,.02,600V,+80/-20%  
DIODE,SCHOTTKY,AXLDS,1A,30V,1N5818  
DIODE,AXLDS,1A,400V,FR,1N4936  
ZENER DIODE,5W,16V,5% 1N5353B  
ZENER DIODE, 1W,18V,5% 1N4746A  
ZENER DIODE, 1W,15V,5% 1N4744A  
ZENER DIODE, 1W,10V,5% 1N4740A  
NOTES:  
S16668-10  
S13490-197  
S13490-195  
S16668-5  
T11577-38  
T12705-23  
T12705-34  
T12702-58  
T12702-45  
T12702-29  
T12702-27  
TESTPT_FUNTION FUNCTIONAL TEST POINT  
S24020-8  
T12218-14  
T12704-72K2  
T12704-68  
S25365-00R1  
S19400-1002  
S19400-9092  
S19400-1821  
S19400-20R0  
S19400-2673  
S19400-4321  
S19400-2213  
S25365-3300  
S19400-8251  
S19400-5622  
S19400-3322  
S19400-1003  
S19400-1000  
S19400-1503  
S19400-3321  
S19400-47R5  
S19400-6810  
S19400-2211  
S19400-1004  
S19400-7501  
S19400-4753  
T13640-24  
N.A. CAUTION: THIS DEVICE IS SUBJECT TO DAMAGE BY STATIC ELECTRICITY.  
SEE E2454 BEFORE HANDLING.  
N.B. MODULE IDENTIFICATION LABEL TO BE PLACED IN THIS AREA.  
R19  
D1  
D2,D6,D7,D8,D9  
DZ1  
DZ2,DZ9  
DZ6,DZ8  
N.C. MOLEX CAVITES AND AREA AROUND LOCKING TAB TO BE FREE OF POTTING MATERIAL. MASK PER  
APPROPRIATE MANUFACTURING WORK INSTRUCTIONS.  
L1  
C 9  
C 10  
N.D. TORQUE TO 3.0 in. lbs. +/-10%.  
DZ7  
FTP4,FTP5,FTP6,FTP7,FTP8  
J47  
L1  
Q1  
Q5,Q6,Q7  
R1,R2,R71,R72  
R5,R10  
R6  
R7,R52  
R8  
R9,R20  
R11  
R12  
R14,R15,R16  
R17,R18,R19  
R21  
N.E. ENCAPSULATE TO WITHIN .10 OF TRAY TOP. WHILE APPLYING ENCAPSULATION, APPLY SOME  
CONNECTOR,MOLEX,MINI,PCB,8-PIN,TIN  
C 1  
OVER THE TOP OF ITEM 11.  
R71  
R2  
R1  
R72  
CHOKE,470UH,10%,11.4A,RADIAL  
MOSFET/HEATSINK ASBLY,T12704-72&S20590-2(SS)  
TRANSISTOR,NPN,TO226,0.5A,40V,2N4401  
RESISTOR,STAND-UP,WW,5W,0.1,5%  
RESISTOR,MF,1/4W,10.0K,1%  
RESISTOR,MF,1/4W,90.9K,1%  
RESISTOR,MF,1/4W,1.82K,1%  
RESISTOR,MF,1/4W,20.0,1%  
RESISTOR,MF,1/4W,267K,1%  
RESISTOR,MF,1/4W,4.32K,1%  
RESISTOR,MF,1/4W,221K,1%  
RESISTOR,STAND-UP,WW,5W,330,5%  
RESISTOR,MF,1/4W,8.25K,1%  
RESISTOR,MF,1/4W,56.2K,1%  
RESISTOR,MF,1/4W,33.2K,1%  
RESISTOR,MF,1/4W,100K,1%  
RESISTOR,MF,1/4W,100,1%  
N.C.  
TP1  
N.A.  
N.F. PRINT “M19753-[ ] “ (LATEST DASH NUMBER AND I.D. CODE) BOARD LABEL.  
N.G. ASSEMBLE ITEMS 1 THROUGH ITEMS 4 AS SHOWN. TORQUE MODULE TO 15-20 IN. LBS.  
N.H. ASSEMBLE P.C. BOARD WITH CAPACITORS LOCATED AS SHOWN.  
TP2  
FTP6  
A1  
R8  
X1  
C3  
C26  
C5  
C6  
X2  
FTP7  
DZ6  
R75  
R73  
R74  
C14  
P.C. BOARD BLANK INFORMATION  
BUY COMPLETE AS M19753-K (4 LAYER BOARD PER E3281)  
(MAKES 8 BOARDS PER PANEL. SEE ELECTRONIC FILE FOR ADDITIONAL INFORMATION)  
PANEL SIZE PER E1911  
FTP8  
R21  
BOOST SUPPLY  
R37,R38  
R39,R40,R64,R65,R66,R67  
R51  
R55  
M19753-  
2
Q1  
RESISTOR,MF,1/4W,150K,1%  
RESISTOR,MF,1/4W,3.32K,1%  
RESISTOR,MF,1/4W,47.5,1%  
R60  
R61,R73,R74,R75  
R62  
R63  
R68  
R69  
R70  
TP1,TP2  
X1  
RESISTOR,MF,1/4W,681,1%  
RESISTOR,MF,1/4W,2.21K,1%  
RESISTOR,MF,1/4W,1.00M,1%  
RESISTOR,MF,1/4W,7.50K,1%  
RESISTOR,MF,1/4W,475K,1%  
MOV,175VRMS,120J,20MM  
10 11  
M15458-8  
S15128-4  
IC,PWM-CONTROLLER,IMODE,2843A  
OP-AMP,QUAD, GEN-PURPOSE,224N  
N.G.  
N.G.  
X2  
1
4
N.G.  
N.G.  
N.B.  
2
3
6
5
12  
ISO VIEW  
REFERENCE ONLY  
N.F.  
N.H.  
8
MANUFACTURED AS:  
4
ITEM PART NO.  
DESCRIPTION  
QTY  
1
2
3
M19996  
HEAT SINK  
1
1
M19753-2K0  
S25347-1  
THERMAL INTERFACE PAD  
N.A.  
M16100-57 ELECTRONIC MODULE ASBLY  
1
2
2
2
1
1
2
1
IDENTIFICATION CODE  
CF000012  
T12735-3  
CF000017  
S25346-1  
M19436-8  
S8025-96  
1/4-20X.50HHCS  
SPRING WASHER  
1/4-20 HN  
4
5
6
7
8
9
GASKET  
MAKE PER E1911& E3875  
POTTING TRAY  
SELF TAPPING SCREW  
7
TEST PER E4036-BT  
N.D.  
SEE ABOVE BOOST PC BD BLANK  
E2527 EPOXY ENCAPSULATING RESIN  
ENCAPSULATE WITH ITEM 9  
*
10 S20590-2  
11 S25253-1  
HEAT SINK  
1
1
2
SCHEMATIC REFERENCE: L11818-2K0  
HEAT SINK MOUNTING CLIP  
LABEL  
N.B., N.F. 12 E3768-4  
* THESE ITEMS NOT SHOWN  
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OWNED BY LINCOLN GLOBAL, INC. AND MAY NOT BE DUPLICATED, COMMUNICATED  
TO OTHER PARTIES OR USED FOR ANY PURPOSE WITHOUT THE EXPRESS WRITTEN PERMISSION OF LINCOLN GLOBAL, INC.  
PROPRIETARY & CONFIDENTIAL:  
UNLESS OTHERWISE SPECIFIED TOLERANCE  
DESIGN INFORMATION  
REFERENCE:  
MANUFACTURING TOLERANCE PER E2056  
EQUIPMENT TYPE:  
SUBJECT:  
PAGE _1__ OF ___  
1
LN-15  
ON 2 PLACE DECIMALS IS ± .02  
FEI  
DRAWN BY:  
ENGINEER:  
APPROVED:  
M19753-1  
SCALE:  
ON  
3
PLACE DECIMALS IS ± .002  
DOCUMENT  
DOCUMENT  
NUMBER:  
ON ALL ANGLES IS ± .5 OF A DEGREE  
BOOST BD HEATSINK ASBLY  
REVISION:  
MATERIAL TOLERANCE (" ") TO AGREE  
t
WITH PUBLISHED STANDARDS.  
MATERIAL  
APPROVAL  
DATE:  
PROJECT  
NUMBER:  
M19753-2  
CRM22115-EF  
UF  
C
05/12/2003  
1:1  
DISPOSITION:  
DO NOT SCALE THIS DRAWING  
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is pro-  
vided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the  
machine.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-6  
G-6  
ELECTRICAL DIAGRAMS  
SCHEMATIC - FEEDHEAD P.C. BOARD - (G3883-1E0/1)  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-7  
G-7  
ELECTRICAL DIAGRAMS  
SCHEMATIC - FEEDHEAD P.C. BOARD - (G3883-1E0/2)  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-8  
G-8  
ELECTRICAL DIAGRAMS  
PC BOARD ASSEMBLY - FEEDHEAD - (G3884-1)  
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is pro-  
vided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the  
machine.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-9  
G-9  
ELECTRICAL DIAGRAMS  
SCHEMATIC - SPI DISPLAY P.C. BOARD - (L11756-1E1)  
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
G-10  
G-10  
ELECTRICAL DIAGRAMS  
PC BOARD ASSEMBLY - SPI DISPLAY P.C. BOARD - (L11757-1)  
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is pro-  
vided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the  
machine.  
LN-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SVM ERROR REPORTING FORM  
We need to know if there are errors in our manuals. We also value any suggestions as to  
additional tests or procedures that would make this SVM a better tool for you.  
If you discover new or different “Problems or Symptoms” that are not covered in the three col-  
umn troubleshooting chart, please share this information with us. Please include the  
machine’s code number and how the problem was resolved.  
Thank You,  
Technical Services Group  
Lincoln Electric Co.  
22801 ST. Clair Ave.  
Cleveland, Ohio 44117-1199  
FAX 216-481-2309  
SVM Number ___________________________  
Page Number if necessary__________________  
Your Company__________________________  
Your Name_____________________________  
Please give detailed description below:  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
___________________________________________________________________________  
SD287 01/99  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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