Nexus 21 Server A1557 User Manual

Nexus 1-8 Loop (A1557)

Analogue Addressable Control Panel

Installation and Commissioning Manual

Contents

Page

1.0

2.0

3.0

4.0

5.0

6.0

Introduction and Guided Tour

Cabinet Installation

Engineer’s Functions

Panel Check

Panel Configuration

Commissioning

Appendices

Technical Specifications

ii.

iii.

Other Relevant Documentation

Compatible Loop Devices and Panel Responses

1.0

Introduction

Thank you for purchasing this Nexus 1-8 loop analogue addressable control panel. This range

of panels is designed to comply with to the requirements of BS5839 part 4 1988. The Nexus 1-

8 loop panel will provide the user with many years of reliable service.

IMPORTANT NOTE: Read the instructions carefully before commencing installation and

commissioning.

1.1

Guided Tour

Document Ref: Nex8inst.doc/Rev0 09.07.00

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System disabled

illuminated when

detectors or inputs

are isolated

Press to reveal

more messages on

the LCD display

General fault

Silence alarms

LCD display

4 x 20 character line

to display 2 events

illuminates when

a general system

fault has occurred

System Reset

control. Press to

reset the system

after the Silence Alarms

has been pressed.

control. Press

to silence the

alarms.

Press to test the

alarm sounders.

Release to clear.

SILENCE

ALARMS

RESET

SYSTEM

Press to clear the

LCD display after

a fault has been

cleared.

Illuminates when the

the mains supply

is healthy.

SCROLL

MESSAGES

CLEAR

DISPLAY

LED flashes when

Test display to

test all LEDs and

panel buzzer.

a fire is triggered. It

then goes steady when

the SILENCE ALARMS

is pressed.

SUPPLY

HEALTHY

GENERAL

FAULT

TEST

ALARMS

TEST

DISPLAY

Silence buzzer control.

Press to silence the fault

or alert buzzer.

FIRE

DISABLED

TEST

ACCESS

SILENCE

BUZZER

Flashing LED in FIRE.

Prompts the user to

operate the SILENCE

ALARMS control in

accordance with the fire

proceedures in operation.

The LED then goes steady.

Press to escape from

the engineer programme

function.

OVERRIDE

DELAY

ESCAPE

DELAY

SYSTEM

FAULT

Press to enter

engineer's data

MESSAGES

ALERT

EVACUATE

ENTER

Press to access

engineers menu

via access code.

Illuminates when

the alarms and panel

outputs would be

delayed in the event

of a fire condition.

ACCESS

CONTROLS

Press to override

the output delay.

Illuminates when

the panel is in

engineers test mode.

Evacuate control operates

the alarm circuits and the

fire relays. Press to operate

and press SILENCE ALARMS

to silence.

Illuminates when

a device is in

an alert condition.

Illuminates when

there is a system fault.

Access Controls Keyswitch.

Position "0" inhibits all the controls.

Position "1" enables all the controls

Flashes when there are

more events to be viewed

on the LCD display.

Pressing the SCROLL MESSAGES

will reveal the data until the

LED goes steady.

1.1.3 Display Printed Circuit Boards as Viewed from Inside Cabinet

EPROM WITH

SOFTWARE

REFERENCE

PROC RESET

DISPLAY

NODE ADDRESS

DIL SWITCH

CONNECT TO

MOTHERBOARD

B/+

A/-

SCN

PROC FAILED

FOR REPEATER

USE ONLY

B/+

A/-

COMMS FAILED

SCN

FLT

24V

24V AND 0V

SUPPLY

PRINTER

INTERFACE

ZONE BOARD

INTERFACE

ZONE BOARD DISABLE

MONITORING LINK

1.1.5 A1557 Motherboard Showing Essential Engineering Components

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Field terminals

J14

keyboard

port

Alarm Alarm

Aux Flt Aux

Repeater

Remote inputs

I/O

Network

Loop1

Loop 2

Aux Fire

A1549 zone

board interface

Fuse8

24V 1A

D0+

DO-

24v

J5 - PC port

Fuse 7

24V 1A

Display

terminals

B1 - Lithium

clock battery

U2 EPROM

J4 A1558 expansion

board interface

[jumper

not fitted]

LBAR2

[See alarm list]

J12 remove if

zone board

monitoring

required

Fuse 9 24V 3A

Fuse 10

24v 3A

Power for

loop

LBAR1

[See alarm list]

expansion

board

Proc

failed

24v

A B C N

off

J9 Buzzer

enable

Silence

alarms

Silence

buzr

Test

alarms

Local

evac

SW 1

Configuration

switches

Processor, display

power and common

fault from PSU

Loop power

from PSU

Reset

system

Test

lamps

J6 - Network

card slot

J8- Loop 2

card slot

J7- Loop 1

card slot

LBAR 1 Alarm List.

Comm failed.

Fire.

LBAR2 Alarm List.

Net enable.

LP1 enable.

Alert.

LP2 enable.

Fault.

LP3 enable.

Isolated.

LP4 enable.

Supply fault.

Alarm fault.

Sil alarms.

Sil buzzer.

Sys reset.

LP5 enable.

LP6 enable.

LP7 enable.

LP8 enable.

Lithium Battery

Caution - danger of explosion if battery is incorrectly replaced. Replace only with same or

equivalent type recommended by the manufacturer. Dispose of used batteries according to

the manufacturers instructions. This battery should be replaced by trained service personnel

only.

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A1557 Field Terminal List [Listed along the top edge of the PCB from left to right]

Terminal Ident. Function

Terminal Ident.

Function

Aux Fire NO 1

Fire relay normally open 1

Fire relay normally closed 1

Fire relay pole 1

Fire relay normally open 2

Fire relay normally closed 2 Network NO +

Alarm 1

Sounder circuit 1 + [Active polarity]

Sounder circuit 1 - [Active polarity]

Sounder circuit 2 + [Active polarity]

Sounder circuit 2 - [Active polarity]

Panel network out +

Panel network out -

Panel network in +

Panel network in -

Loop 1 out +

Loop 1 out -

Loop 1 in +

Loop 1 in -

Loop 2 out +

NC1

NO 2

NC2

Alarm 2

Fire relay pole 2

Fault relay pole

NO-

NI +

NI -

LO+

LO-

LI+

LI-

LO+

LO-

LI+

LI-

Aux Flt

24V

MX+

MX-

Fault relay normally open

Fault relay normally closed

Aux DC supply [24V]

Aux DC supply [0V]

Local I/O expansion port +

Local I/O expansion port -

Repeater out +

Repeater out -

Repeater in +

Repeater in -

Loop 1

Loop 2

Aux

I/O

Repeater RO +

Loop 2 out -

Loop 2 in +

Loop 2 in -

RO -

RI +

RO -

Remote

Inputs

SAL

Silence alarms

RST

EVC

SBZ

COV

FLT

Reset

Evacuate

Silence buzzer

Class change alarm

Fault

1.1.6 Power Supply Illustration

12V

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1.1.7 Loop Card Expansion Motherboard

Loop 3

Loop 4

Loop 5

Loop6

Loop 7

Loop 8

24V

1.1.8 Programmable Expansion Boards

Up to 31 A1535 (relay) and A1536 (alarm) programmable expansion boards may be connected

to the Nexus 1-8 loop (A1557) panel. Two boards may be housed internally, the remainder

require other enclosures. Refer to the A1535/A1536 Installation & Commissioning Manuals

for further details.

(i)

The A1535 board provides 8 programmable inputs and 8 programmable relay circuit outputs.

(ii) A1536 8 Way Programmable Input/Output Alarm Board

A1535 8 Way Programmable Input/Output Relay Board

The A1536 board provides 8 programmable inputs (0V switched) and 8 programmable alarm

circuit outputs.

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2.0

Cabinet Installation

WARNING: Please read this section completely before commencing installation.

Prior to commencing installation of the control panel, ensure that adequate precautions are

taken against static damage to the sensitive electronic components on the control board. You

should discharge any static electricity you may have accumulated by touching a convenient

earthed object, e.g. an unpainted copper radiator pipe. You should repeat the process at

regular intervals during the installation process, especially if you are required to walk over

carpets.

The panel must be powered down before removing or replacing any card or module. Failure

to observe this may cause damage to the loop cards and the motherboard.

When changing any plug-in cards, observe anti-static precautions. Ensure that all power is

removed from the system. Failure to do so may result in damage to the cards or panel.

The panel must be located in a clean, dry position which is not subject to shock or vibration

and at least 2 metres away from pager systems or any other radio transmitting equipment.

The maximum temperature range is 0ºC - 40ºC; maximum humidity is 95%.

This equipment contains dangerous voltages. To prevent electric shock to unqualified

personnel ensure that the door is locked at all times when the panel is left unattended. Do

not leave the key to open the panel door with unqualified personnel. There are no user-

serviceable parts inside.

IMPORTANT NOTES ON BATTERIES:

DANGER: Batteries are electrically live at all times, take great care never to short circuit the

battery terminals.

DANGER: A lithium “coin cell” is fitted to the motherboard PCB. There is a danger of

explosion if this battery is incorrectly replaced. Replace only with same or equivalent type

recommended by the manufacturer. Dispose of used batteries according to the

manufacturer’s instructions. The replacement of this battery must be carried out by trained

service personnel only.

WARNING: Batteries are often heavy, take great care when lifting and transporting

batteries. For weights above 24 kilos, lifting aids should be used.

WARNING: Do not attempt to remove battery lid or tamper with the battery internal

workings. Electrolyte is a highly corrosive substance, and presents significant danger to

yourself and to anything else it touches. In case of accidental skin or eye contact, flush the

affected area with plenty of clean, fresh water and seek immediate medical attention.

VRLA batteries are “low maintenance” requiring no electrolyte top-up or measurement of

specific gravity.

WARNING: If required, clean the case with a cloth that has been soaked or dampened with

distilled water. Do not use organic solvents (such as petrol, paint thinner, benzene or mineral

spirits) and other materials can substantially weaken the case.

WARNING: Avoid operating temperatures outside the range of -15°C/5°F to +50°C/122°F

for float/standby applications.

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DANGER: Do not incinerate batteries. If placed in a fire, the batteries may rupture, with the

potential to release hazardous gases and electrolyte. VRLA batteries contain substances

harmful to the environment. Exhausted batteries must be recycled. Return them to the battery

manufacturer or take them to your Council tip for appropriate disposal.

We recommend that isolators are installed at both ends of each loop, immediately the loop

leaves the panel.

The volt-free relay contacts provided within the panel must not be used directly to switch any

voltage which exceeds 50VAC or 75VDC. (Please also refer to relay rating data).

This equipment requires a 230V AC supply. All installation work should be carried out in

accordance with the recommendations of BS5839 Part 1 and the current edition of the IEE

regulations by suitably qualified and trained personnel.

The panel must be earthed.

Locate the panel keys and the Installation Kit containing installation spares as follows:

2 off resistors 3K9

5 off 20mm glass fuses (assorted)

1 set of battery leads (positive, negative and a jumper lead)

Open the display door with the key provided. Carefully remove the control panel interior by

releasing the cables to the display (carefully noting the connections), the top two chassis

screws (located top left and right through the motherboard) and removing the lower two screws

(located bottom left and right) on the chassis plate. Open the right hand door and remove

chassis in similar manner.

Note: The chassis screws are bright chrome finnish

Fix the empty enclosure to the wall using the fixing hole(s) in the upper section of the

enclosure. Complete the fixing operation using the remaining fixing holes in the enclosure.

Gland installation wiring into the enclosure using the cable entry points provided. Leave plugs

in any unused cable entry holes.

Replace and fix the control panel chassis. Reconnect any internal earth wires.

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3.0

Engineer’s Functions

A number of engineering functions are provided by the control unit in order to allow the system

to be configured specifically to accommodate site requirements. Further functions are provided

to assist in commissioning and servicing the finished fire detection system.

There are three separate codes for access to the three engineer function levels. When the codes

have been entered, the user is guided through the sequence of operations, for the chosen

function, by text displayed on the LCD.

Prior to entering the engineers function menus, it is necessary to check that the panel is

configured to the correct quantity of loops, open the display door and locate the 4 position DIL

switch marked SW1. The switch settings are tabulated below:

SW1-3

OFF

SW1-2

OFF

SW1-1 NUMBER LOOPS

OFF

1 LOOP

2 LOOP

3 LOOP

4 LOOP

5 LOOP

6 LOOP

7 LOOP

8 LOOP

OFF

SW1-4 should be in the OFF position if the panel is to operate as a standard system. If the panel

is to operate as part of a network system then SW1-4 should be in the ON position.

Notes: The time/date function is now backed up by an internal lithium “coin cell”. This

battery is non rechargeable but at 70 mAh, will support the clock in conditions of total power

failure, for 10 years. The replacement of this battery is intended to be carried out by service

engineers only. The part number is CR1620.

The download lead is a standard “null-modem” RS232 lead with 9 pin D type connectors. This

can be supplied by CEL or obtained direct from Maplins - catalogue ref VD76H. New lead

connections below:

Panel end

Pin Link

PC end

Pin Link

The “Cherry” keyboard in current use can be connected directly to the motherboard via J14 5

pin Din socket without use of the converter lead.

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4.0

Panel Check

Ensure that the mains supply has been inspected and tested in accordance with BS5839 Part 1

and the current IEE regulations and that the system is correctly earthed.

4.1

4.2

Leave all test resistors in place and connect the 230V mains supply.

Switch on. The control panel should react as follows:

(i) The internal buzzer will sound

(ii) The “System on” LED will illuminate

(iii) The LCD will display a time [which needs to be checked)

5.0

Panel Configuration – Engineer’s Operating Instructions

NOTE: Please read the panel configuration options before proceeding to commissioning.

5.1 Introduction

The functions are intended to allow a complete system to be set up at site level. Three levels of

engineer functions are provided. The access system is arranged such that level 1 access only is

possible with code 1, levels 1 & 2 with code 2 and all levels with code 3. Level 1 functions are

intended for the end user. When the engineer functions are selected, the control panel in most

cases still fully operational i.e. an alarm condition will fully activate the panel. The only

options which cause the panel not to be fully operational are described later under “Status -

disabled” and “Sensor test”.

All engineering menu functions are available after operating the ACCESS CONTROLS key

switch and then pressing ENGINEER on the display, followed by input of the appropriate four-

digit access code.

If system is left in the engineers mode without controls being pressed, the panel will “time out”

to normal operation. Time-out periods vary, depending upon option selected, from 1 to 15

minutes.

5.2

Overview of Engineer’s Menu Options

5.2.1 Access level 1

1278

1:SET TIME/DATE

2:ISOLATE DEVICES

3:EDIT DEV/LOGO TEXT

Single device, range, de-isolate all, read.

Via PC or special QWERTY keyboard.

5.2.2 Access level 2

7218

4:CONFIGURE LOOP

The panel will identify and report the type and quantity of sensors

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used on the loop (i.e. ionisation smoke, optical smoke, or heat

sensor)

5:DEVICE STATUS

The analogue value can be identified & the detector self-tested, the

detector LED and the Remote LED can be turned on either in the

enabled mode or the disabled mode.

6:LOOP CONTENTS

Panel reports loop content on the display.

7:ZONE ALLOCATION

255 zones (of which 64 are visible indication zones), programmable

across 8 loops and/or panel inputs.

8:ALARM TEST

9:DEVICE TEST

Sounders operate for 1 second every 10 seconds.

Illuminates the device LED. Pulses the fire LED on the panel and

sounds the internal buzzer. No sounder operation, System

automatically resets after 25 seconds ready for the next device test.

Provides access to extended menu as detailed below:

0:EXTENDED MENU

1:ALERT TRIP LEVELS

2:FIRE TRIP LEVELS

3:PANEL DELAY

Analogue values 35 - 50 in increments of 5.

Analogue values 55 - 70 in increments of 5.

Overridden by Delay Override, BGU or Evacuate.

Set enable period day/night, delay time 1-10 minutes

Enable/disable.

4:READ MEMORY

64 events - most recent first.

5:CLEAR PRINT QUEUE

Clears events in printer queue.

6:NUMBER OF DISPLAYS Sets number of panel displays/repeaters.

7:PRINT MEMORY

8:PRINT C/E DATA

64 events - most recent first.

Single output, loop address or full listing.

5.2.3 Access level 3

8812

9:EDIT C/E DATA

0:NETWORK

Panel and loop (See Cause/effect programming guide).

Configures panels in a network.

5.3

Accessing Engineer’s Menu

Note: You must operate the ACCESS CONTROLS keyswitch for all engineer’s and user

functions.

Step 1 - Press

ACCESS MENU to reveal the following:

0 9 : 0 4 : 2 6

P a n e l N a m e

- - - - - - - - - - - - - - - - - - - -

E N T E R C O D E , P R E S S

Step 2 - Press appropriate Engineer’s code as section 4.2 above

to reveal the following:

S E L E C T L E V E L 2 O P T I O N

1 : S E T T I M E / D A T E

2: : I S O L A T E D E V I C E S

N E X T P A G E

Q U I T

Step 3 - Press

to scroll through the Engineer’s Menu.

NOTE: No facility is accessible unless it is shown on-screen.

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Step 4 - Select the number of the engineer’s facility required by pressing the corresponding

number button.

5.4

Setting Time & Date

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 1:SET TIME/DATE.

S E L E C T L E V E L 2 O P T I O N

E N T E R T I M E

h h m m s s

B A C K S P A C E

E N T E R

Time is entered as two digits for each of the hours, minutes and seconds; eg 8am is 08:00:00.

The clock starts, at the time set, when the

ENTER key is pressed.

The date may then be entered as two digits for each of the day, month and year for example, the

3rd of August 1997 is 03:08:97. It is not necessary to press the ENTER key after entering the

date, the system automatically returns to normal operation.

5.5

Isolate

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 2:ISOLATE DEVICES.

Within this sub-menu, the following four options are available. Use the

options (if not currently displayed). Select the required option by pressing the corresponding

number button and then follow the on-screen instructions for each option.

to view these

I S O L A T I O N F A C I L I T Y

Enables the engineer to isolate/de-isolate loop devices

1 .

2 .

S E N S O R S

P A N E L

I N P U T S

N X T P A G E

Q U I T

Enables engineer to isolate/de-isolate programmable panel inputs

To select next page (printer isolate)

Selecting Option 1. SENSORS reveals the following screen:

S E N S O R

I S O / D E - I S O

Enables the engineer to isolate/de-isolate a range of devices

1 . S I N G L E

3 . R E A D

2 . R A N G E

4 . D E I S A L L

Q U I T

Enables the engineer to de-isolate all the devices

Enables the engineer to view the devices isolated

Enables the engineer to isolate/de-isolate a single device

Within options 1 and 2 above of the Sensor Iso/Deiso screen, follow the on-screen instructions

to enter loop and sensor number(s). Press

following will appear:

ENTER at each stage. A screen similar to the

I D E N T I F Y D E V I C E

Current Status

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0 1 : 0 0 1 D E - I S O L A T E D

1 . I S O

2 . D E - I S O

Q U I T

Press 2 to de-isolate

Press 1 to isolate

Loop & device number

Selecting Option 2 . PANEL INPUTS on the ISOLATION FACILITY screen reveals the

following where the user is prompted to enter the input number followed by

ENTER.

I D E N T I F Y

I N P U T

Current Status

I N P U T

1 . I S O

0 0 1 D E I S O L A T E D

2 . D E - I S O

Q U I T

Press 2 to de-isolate

Press 1 to isolate

Input number

When any device is isolated, the DISABLED LED indicator on the panel will illuminate.

5.6

Edit

This option is used to enter device location messages and to enter the company name of the

installation. Text editing must be done using either the PC download facility or special

keyboard.

WARNING: We strongly recommend that no text editing should be attempted without the

use of the PC down-load facility due to the extensive range of options available. However, if

direct panel programming is unavoidable, a separate document entitled “Programming the

Nexus 1-8 Loop Analogue Addressable Control Panel Without a PC” is available.

5.7

Configure Loop

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 4:CONFIGURE LOOP.

Then follow on-screen instructions.

All devices on a loop must be configured using this option in order for the panel to respond to

these devices.

The control panel is automatically searching the detection loop circuit and noting the type of

devices at the various addresses. The process takes approximately 16 seconds to complete and

provides the following report:

P R I O R I T I E S

0 0 0

S M O K E D E T E C T O R S

H E A T D E T E C T O R S

O U T S T A T I O N S

5.8

Device Status

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 5:DEVICE STATUS.

Selection of this option provides interrogation and control of individual loop devices. Within

this sub-menu, the following three options are available:

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Selecting this option provides all the interrogation and control

functions. All output functions are disabled and only the

chosen device is being polled. This allows sensor devices to be

put into the test mode without alarms, etc. being raised and

allows observation of the rising analogue value.

D E V I C E

D I S P L A Y

S T A T U S

( D I S A B L E D )

( E N A B L E D )

P R I N T D E V / S

S T A T U S

Selection of this option causes the control panel to

output status information for all connected devices

to its printer (if fitted).

Selecting this option enables specified

devices to be interrogated and for commands to be sent to the devices. When the self test

mode is entered in this condition, the device under test should eventually enter an alarm

condition. When this occurs the control panel will react as if a genuine alarm condition

had been detected. The system will exit the engineer’s test mode and will need to be

silenced and reset in the normal manner.

5.8.1 Status Disabled/Enabled

Selecting Status options 1 or 2 will allow the engineer to enter the loop and device numbers.

The display then shows the following:

ADR VAL TYPE STS CMD

100 23 ION 000 000

ZONE 12 CMD BITS=123

4)PREV 5)NEXT #)END

The typical display example shown above is interpreted as follows:

The device address (ADR) is 100

The analogue value (VAL) is 23

The device type (TYPE) is ionisation smoke (ION)

The input status (STS) is 000

The control panel command status (CMD) is 000

The allocated zone for the device is 12

Key 4 allows the user to move to the previous device. The above example will be decreased to

address 99.

Key 5 allows the user to advance the address of the device being interrogated. The above

example will be advanced to address 101.

Key # to escape.

The device TYPES which may be indicated are as follows:

SOU

O/S

ION

MON

OPT

Sounder circuit controller

Input/Output device

Ionisation smoke sensor

Monitor (zone monitor, control monitor)- Device type code reference no. 4

Optical smoke sensor

Heat sensor

- Device type code reference no. 1

- Device type code reference no. 2

- Device type code reference no. 3

- Device type code reference no. 5

- Device type code reference no. 6

- Device type code reference no. 7

HEAT -

BGU

Call point or call point monitor

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The keypad keys 1, 2 & 3 become control switches for the 3 control panel command bits.

(Indicated by the numbers 123 under the CMD indicators).

Pressing key 1 causes command bit 1 to toggle between 0 and 1, key 2 for bit 2 and key 3 for

bit 3.

The 3 command bits have different purposes depending upon the device type. In the case of

smoke (ion and opt) and heat sensors, the command bit allocation is as follows:

Turn on Remote LED

Enter self test mode

Turn on Sensor LED

Break glass units respond to bits 2 & 3 only.

For command functions of other devices, refer to relevant literature.

Typical control example:

When a command bit is sent to a device, after a short delay, the status confirmation - returned

from the device - will be shown on the LCD. With the display as shown above, pressing key 3

turns on the sensor LED at device number 100. Pressing key 3 again turns it off.

WARNING: In the enabled condition the response of devices to the command codes will be

relatively slow due to the fact that the control panel is polling all connected devices and

command bits are required to be sent to the device twice.

When an ionisation sensor is tested, the display may briefly show an “ALERT” condition as

the sensor output rises. Other sensors react more quickly and appear to reach FIRE

condition immediately.

WARNING: If tests are carried out in the disabled mode, it is essential that the command

bits for each device be returned to 000 before moving on to another device. Failure to

observe this requirement will mean that, if a device has been left in the test mode, upon

returning to normal operation a fire alarm condition will be raised.

The control panel does clear the command bits upon return to normal operating condition

but the sensor devices respond too slowly and the control panel reads this as a fire alarm

condition.

To exit from the status option, press the # key. This returns the control panel to normal

operation.

5.8.2 Status To Printer

The format of the printed status report is shown in the short example below:

06/09/97 11:13:05

LOOP STATUS REPORT

ADR VAL TYPE ZONE

001 25 ION

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025 16 BGU

123 21 HEAT

END OF LOOP REPORT

5.9 Loop Contents

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 6:LOOP CONTENTS.

Selecting option 6 causes the display to show a list of the devices currently configured without

actually re-configuring the system. The format of the report is as shown under the

CONFIGURE Loop option previously explained (see section 4.7 above).

5.10 Zones

WARNING: We strongly recommend that no zone editing should be attempted without the

use of the pc down-load facility due to the extensive range of options available. However, if

direct panel programming is unavoidable, a separate document entitled “Programming the

Nexus 1-8 Loop Analogue Addressable Control Panel Without a PC” is available.

5.11 Alarm Test

The purpose of the Alarm Test facility is for audibility testing.

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 8:ALARM TEST and

follow on-screen instructions.

In this condition the control panel will automatically sound the panel and loop alarms and the

internal panel buzzer for 10 seconds every 15 seconds. This will continue until key 2 is pressed

or for a maximum of 15 minutes whichever occurs first.

All auxiliary outputs are disabled.

5.12 Device Test (Also known as the One Man Test Mode)

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 9:DEVICE TEST.

In this condition sensors may be triggered manually. Device operation illuminates the device

and LED pulses the fire LED on the panel and sounds the internal buzzer. No sounder

operation, System automatically resets after 25 seconds ready for the next device test. All other

outputs are disabled in this mode.

5.13 Extended Menu

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

For options available within this extended menu, see section 5.2.1 above. Use

through options.

to scroll

5.14 Alert Trip Level

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This gives the option of adjusting the alert trip level of individual devices to suit particular

installation conditions. To adjust the trip level follow the procedure below:

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

S E L E C T L E V E L 2 O P T I O N

1 :

2 :

A L E R T T R I P L E V E L S

F I R E T R I P

N E X T P A G E

L E V E L S

Q U I T

Select 1: ALERT TRIP LEVELS & follow on-screen instructions, selecting loop & device no.

By repeatedly pressing the button designated TOGGLE, the engineer may view the various pre-

alarm levels available.

The required level may be selected by pressing

OK, then

to quit.

5.15 Fire Trip Level

This gives the option of adjusting the fire trip level of individual devices to suit particular

installation conditions. To adjust the trip level follow the procedure below:

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Select 2: FIRE TRIP LEVELS.

By repeatedly pressing the button designated TOGGLE, the engineer may view the various fire

trip levels available.

The required level may be selected by pressing

OK, then

to quit.

5.16 Panel Delay

This gives the option to have a delayed response of panel and loop alarms & auxiliary relays to

a fire condition. This facility is programmed to be active during a specified period of the

day/night. The engineer must firstly set the time on/off period; this is the time of day/night

during which - if an alarm event were to occur - a delay would be effective. Secondly he must

select the period of the delay (1 - 10 minutes). Thirdly he must enable the delay for it to be

effective.

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At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Select 3:PANEL DELAY. This will reveal the following:

Setting the time period of day or night during which, if a fire condition

occurred, the outputs would be delayed.

* * S E T P A N E L D E L A Y S * *

1 :

2 :

T I M E O N / O F F

D E L A Y P E R I O D

N X T P A G E

Q U I T

Setting the output delay time. Press # to set 1 to 10 minutes.

Selecting 1: TIME ON/OFF will reveal the following two sub-menu options:

* * S E T P A N E L D E L A Y S * *

Setting the beginning of the time period

Setting the end of the time period

1 :

2 :

T I M E E N A B L E

T I M E D I S A B L E

Q U I T

Selecting

following:

NXT PAGE in the SET PANEL DELAYS main menu, will reveal the

* * S E T P A N E L D E L A Y S * *

Enabling or disabling the panel delay function.

3 :

E N / D I S D E L A Y

N X T P A G E

Q U I T

5.17 Read Memory

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Selecting option 4 will cause the display to show the last 64 events held in the panel’s memory.

Press

to scroll through the events. Press

to exit to the main menu. The events are

displayed in reverse order i.e. most recent event first.

5.18 Clear Print Queue

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Select option 5 to clear all outstanding reports from the printer queue.

5.19 Programming the Number of Displays ( Repeaters )

Select Option 6: NUMBER OF DISPLAYS

This function is used to view/configure the number of displays connected to the control panel.

Display 01 is the panel’s own display. Displays 02 to 15 must be used for repeater panels.

NOTE: This function tells the main panel how many displays to look for. It must be used in

conjunction with the Nexus repeater panel manual where repeaters are used. Each display

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has its own DIL switch address setting. These addresses must be set in accordance with the

repeater panel manual. The panel’s own display DIL switch setting must not be changed.

* N U M B E R O F D I S P L A Y S *

Displays current status

D I S P L A Y

0 1_

* = E N T E R ,

# = D E L E T E

To change number of displays

To accept number of displays

5.20 Print Memory Contents

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Select 7: PRINTER MEMORY.

The format of the printer memory report is shown in the short example below:

PANEL NAME

1:063 Z01 BGU FIRE

00:02:35

01/01/98

ALARMS SILENCED

00:02:42

01/01/98

SYSTEM RESET

00:02:45

01/01/98

5.21 Print Cause and Effect Data

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Selecting 8: PRINTER C/E DATA will print all local cause & effect information.

5.22 Options Available at Access Level 3

At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU.

Three options are available:

1) Edit Local Cause/Effect

2) Edit Network Cause/Effect

3) Print Network Cause/Effect

Select 9: EDIT C/E DATA.

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WARNING: We strongly recommend that no local cause/effect editing should be attempted

without the use of the pc down-load facility due to the extensive range of options available.

However, if direct panel programming is unavoidable, a separate document entitled

“Programming the Nexus 1-8 Loop Analogue Addressable Control Panel Without a PC” is

available.

Select 0: NETWORK

WARNING: We strongly recommend that no network cause/effect editing should be

attempted without the use of the pc down-load facility due to the extensive range of options

available. However, if direct panel programming is unavoidable, a separate document

entitled “Programming the Nexus 1-8 Loop Analogue Addressable Control Panel Without a

PC” is available.

6.0

6.1

Commissioning

Introduction

The following equipment should be available where possible to minimise commissioning time:

(i) VHF/UHF Portable Radio (for two engineers)

(ii) Multi-meter or equivalent

6.1.1 Checklist

Before commissioning, the engineer should check the following:

(i) All field wiring has been inspected and tested in accordance with CEL wiring

recommendations, BS5839 part 1 and current IEE wiring regulations.

(ii) All field cables are glanded into the control panel cabinet.

(iii) Detector bases are terminated but detector heads are not fitted. Any devices with

electronic components are not fitted. Terminations to devices with electronic

components should be linked through to maintain cable continuity.

(iv) Call points are not connected but cable is linked through to maintain continuity.

(v) No end-of-line devices (eg alarm circuit EOL resistor) are fitted.

6.1.2 The following information should be available to the commissioning team:

(i) Detection layout drawings and address information

(ii) Wiring schematic diagram

(iii) Panel Planning Sheet and Cause/Effect Sheet (where applicable)

(iv) PC or QWERTY keyboard for programming

(v) Control Panel installation manuals

(vi) Installation manuals for all equipment connected to the system

6.1.3 Experience has shown that tracing wiring faults on long circuits which are routed

through risers etc. can be difficult without knowledge of the wiring route.

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It is recommended that the electrical installer is made available until basic wiring continuity is

proven. A minimum of two persons (e.g. engineer and mate) is recommended for efficient

commissioning.

6.2

An Overview of the Commissioning Procedure

The approach to be used when commissioning a fire alarm system is to check each circuit and

function in turn to ensure correct operation of the entire system. In this way any faults may be

located quickly and accurately. The general procedures are as follows:

Alarm circuits should be checked first. The correct operation of each sounder should be

checked for correct audibility as specified in BS5839 part 1, using the “Test Alarms” facility.

Detection loops should be commissioned next. The purpose is to establish the correct

functioning of each device and checking for correct indication at the control panel. Any

auxiliary circuits may then be tested.

WARNING: Before testing, the engineer must be aware both of the operation of all devices

fitted to the auxiliary circuits and of the consequences of their operation.

6.3

Pre-Commissioning Wiring Check

NOTE: This pre-commissioning wiring check procedure should be followed to test all wiring

prior to specific commissioning of any detection, alarm and auxiliary circuits.

6.3.1 The following assumes that the control panel has been installed in accordance with the

installation procedure and is powered with only the “Power On” LED illuminated. Do

not connect field wiring at this stage.

6.3.2 Ensure that there are no devices connected to the loop and alarm circuits but the cables

are linked through at the device locations to achieve a continuous circuit.

6.3.3 Ensure that resistance of all cables to earth and between cores is more than 1MΩ.

Check the following:

(i) Positive to earth resistance is greater than 1MΩ

(ii) Negative to earth resistance is greater than 1MΩ

(iii) Positive to negative resistance is greater than 1MΩ

(iv) Place a short circuit across the ends of the loop and alarm circuits. Measure the

resistance across the positive and negative cables of each of the circuits and ensure

that the value does not exceed the value calculated on the Loop Calculator

Spreadsheet. Remember to remove the short circuits after the tests.

Correct polarity throughout all circuits must be maintained. Rectify any faults.

6.3.4 Power down panel. All bells, detector heads and call points should now be connected

and alarm circuit end-of-line resistors fitted. Use the spare end-of-line resistors

supplied and leave the EOL resistors in the panel terminals at this stage. Be very

careful to maintain correct polarity at each device.

6.4

Commissioning Procedure

6.4.1 Alarm Circuits

After completion of the pre-commissioning wiring check, this procedure should be followed:

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(i)

Remove the resistor from the first alarm circuit terminal and connect the first alarm

circuit wiring to the terminals, observing correct polarity. Check that any alarm fault

indications clear after a few seconds.

(ii)

Press the “Evacuate” switch. Check that all sounders connected to the alarm circuit

operate.

(iii)

(iv)

Press “Silence Alarms” and “Reset”.

Repeat steps (5.4.1) to (5.4.3) for the second and any subsequent alarm circuits.

6.4.2 Commissioning Loops

NOTE: The pc down-load facility may be used at any stage up to Section (v).

(i)

Insulate and physically protect the positive and negative ends of one end of the

detection loop wiring. Connect the other end of the wiring to the panel terminals LO+

and LO- for loop 1.

(ii)

Enter the engineers test mode at level 2 and select option 4 (Configure). After the

configuration period, the panel will report the numbers of the different types of sensors.

If the numbers and types of sensor agree with the physical check already carried out,

proceed to the next stage (iv).

(iii)

(iv)

If double addressing of detectors is found on the loop, the LCD display will show a

report of the device numbers affected. The engineer may also notice a device missing

from the expected total quantity of loop devices.

When all required sensors have been configured, select engineer’s Option 5: STATUS

and using the STATUS DISABLED option, interrogate the devices on an individual

basis. To view correct electronic operation, press button for command bit 2 (self test

mode). Press again to return detector to quiescent state. To turn a device LED on (to

identify its correct location), press button for command bit 3. Press again to return

detector to quiescent state. To turn a remote device LED on (to identify its correct

location), press button for command bit 1. Press again to return detector to quiescent

state.

(v)

Repeat sections (i) to (iv) for each loop.

(vi)

Sensor installation is now complete and the return end of the detection loop may now

be connected to the LI+ and LI- terminals.

WARNING: Before connecting, ensure that the returning polarity is correct.

The final phase of the sensor commissioning involves replacing all the short circuit isolators.

The supply polarity to isolators is important and must be checked and corrected if necessary

before fitting the isolator.

WARNING: If the isolator polarity is found to be incorrect, it is absolutely essential that the

polarity is corrected at each termination point throughout the wiring. Failure to observe this

will result in the polarity of the return end of the cable becoming incorrect with the

possibility of damage to the control panel.

6.5

A1535 (Programmable Relay Expansion Boards) and A1536

(Programmable Alarm Expansion Boards)

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Refer to the Installation & Commissioning Manuals for these boards.

6.6 Auxiliary Circuits

Any auxiliary circuits or equipment which is not supplied as a standard part of the fire alarm

panel is the responsibility of the installer and must be tested for safe and correct operation by

the commissioning engineer. If special output facilities are provided as extra equipment, refer to

separate drawings and manuals for commissioning information.

6.7

Cause & Effect Editing

The Nexus panel may now be programmed with the text, zone and cause & effect information.

WARNING: We strongly recommend that no cause & effect programming should be

attempted without the use of the pc down-load facility due to the extensive range of options

available. However, if direct panel programming is unavoidable, a separate document

entitled “Programming the Nexus 1-8 Loop Analogue Addressable Control Panel Without a

PC” is available.

6.7.1 Cause & Effect Testing

Testing of the panel’s fire and fault relays and all cause & effect outputs must be done with the

system fully functional. There are two options:

(i) Operate field devices and physically check programmed output devices for correct

operation.

(ii) Select engineer’s option 5: STATUS and operate devices with the System Enabled

option as described in the Nexus 1-8 Loop Installation Manual. This will cause

selected devices to go into fire and operate the panel’s cause & effect programming.

Physically check programmed output devices for correct operation.

6.8

Final Commissioning

6.8.1 Select engineer’s Option 9: DEVICE TEST and carry out tests on all sensor devices.

6.8.2 Testing of the panel’s fire and fault relays and all cause & effect outputs must be done

with the system fully functional.

There are two options for testing the panels cause & effect:

(i) Operate devices as required

(ii) Use engineer’s Option 5: STATUS, selection 1 SYSTEM ENABLED to operate

devices

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Appendices

Technical Specifications

NOTE: Due to the wide scope of panel options, we strongly recommend the use of our

battery calculation chart which is available on PC disk or as hard copy. The information

below should not be used to calculate standby battery size.

Power Supplies

Mains input voltage:

230V AC -6% + 10%

System operating voltage:

Quiescent current at 24V DC:

Quiescent loop card current

Loop card max. current

Power supply max:

24V DC

375mA (A1557. A1508, A1575 – no loop cards)

65mA + 1.3 x loop current

200mA

5 Amps @ 24V DC

Alarm power output max:

Auxiliary output max:

Battery charger output:

Battery type:

1 Amp per circuit @ 24V DC (Note 3)

0.5 Amp @ 24V DC (Note 4)

1.5 Amps (Note 5)

24V sealed lead acid

Output Circuits

Alarm circuits:

Alarm circuit monitoring:

Repeater output:

Printer output:

Open/short circuit (Note 6)

Serial data RS485 (Note 7)

Parallel

Multiplex inputs/outputs:

Panel Network:

Alarm fuse rating:

Battery fuse rating:

Auxiliary fuse rating:

Mains fuse rating:

248 (via A1535/A1536 boards)

Connection of 15 panels via Network data link

1 Amp thermal resetable fuse

6.3 Amp (20mm glass)

0.5 Amp (20mm glass)

3 Amp (20mm glass)

Input Circuits

Detection loops:

Detection loop fuse rating:

No. of sensors on loop:

Cable 1.5mm (max. length - 2km)

250mA thermal resetable

126 maximum (Note 9)

Relay Outputs

2 independent relays are provided which operate as follows:

Fire relay:

Fault relay:

1 double pole changeover, operates on any fire alarm

1 single pole changeover operates on any fault signal

All relay contacts are rated at 24V DC 1 Amp.

Cable Terminations

Mains terminals:

Alarm and loop terminals:

All other terminals:

Shrouded, marked & fused, accept max 2.5mm²cables

Screw terminals, accept max. 2.5mm²cables

All terminal functions are identified by screen printing on the circuit boards.

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NOTES:

We strongly recommend the use of the Battery and Loop calculator for assessing the

correct size of the standby batteries and correct loop function in all conditions.

Quiescent current is stated assuming mains failure conditions, therefore the general

fault LED will be illuminated and the fault buzzer will sound.

The total current drawn by both alarm circuits operating must not exceed 2 Amps.

The total DC auxiliary current drawn must not the values stated in the Technical

Specification. The power supply current limiting will operate if ratings are exceeded.

The battery charger employed is the constant voltage type and the current will be

dependent upon the state of charge of the battery.

Alarm line monitoring operates using polarity reversal. All alarm sounders and/or

visual alarms must be made polarity sensitive for line monitoring to operate correctly.

Repeater data output is available at terminals in the control panel. Two cores are

required for the connection of repeater panels. The maximum cable length between the

control unit and any repeater unit is 2000 metres. The cable must be suitable for RS485

data such as Belden 8132 or equivalent. If power is provided from the control unit, 2

additional cores are required.

The control panel provides an RS485 multiplex data link for driving additional output

devices such as zonal relays, alarms, mimic indicators etc. The output functions are

programmable at site level.

The number of sensor devices may need to be reduced due to the power requirements

of the devices themselves. Fire sensors, heat smoke, call points etc. may be fitted in any

combination up to the maximum (126) addressing capability of the protocol. Zone

monitors in particular require a higher operating voltage and also draw significantly

more current from the control unit; reference to the system design manual is necessary

if zone monitors are to be used on the loop.

10.

If any devices which contain an inductive coil (relays etc.) are connected to the panel,

these should be suppressed by connecting a diode across the positive and negative

connections of the coil.