Nexus 21 A1557 technical specifications Display

Models: A1557

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LCD display

4 x 20 character line to display 2 events

System disabled

 

illuminated when

Press to reveal

detectors or inputs

are isolated

more messages on

 

the LCD display

General fault

Silence alarms

 

illuminates when

control. Press

Press to test the

a general system

to silence the

alarm sounders.

fault has occurred

alarms.

Release to clear.

 

 

 

System Reset control. Press to reset the system

after the Silence Alarms has been pressed.

Illuminates when the the mains supply

is healthy.

LED flashes when a fire is triggered. It then goes steady when the SILENCE ALARMS is pressed.

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.

SUPPLY

GENERAL

HEALTHY

FAULT

FIRE

DISABLED

ACCEPT

TEST

DELAY

SYSTEM

ON

FAULT

ALERT

MORE

MESSAGES

 

1

SILENCE

RESET

7

ALARMS

SYSTEM

 

 

2

SCROLL

CLEAR

8

MESSAGES

DISPLAY

 

 

3

TEST

TEST

9

ALARMS

DISPLAY

 

 

4

ACCESS

SILENCE

0

MENU

BUZZER

 

 

5

OVERRIDE

ESCAPE

#

DELAY

 

 

 

6

EVACUATE

ENTER

*

 

 

 

Press to clear the LCD display after a fault has been cleared.

Test display to test all LEDs and panel buzzer.

Silence buzzer control. Press to silence the fault or alert buzzer.

Press to escape from the engineer programme function.

Press to enter engineer's data

Illuminates when the alarms and panel outputs would be delayed in the event of a fire condition.

ACCESS

CONTROLS

Press to access engineers menu via access code.

Press to override the output delay.

Illuminates when a device is in

an alert condition.

Illuminates when the panel is in engineers test mode.

Illuminates when there is a system fault.

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.

Evacuate control operates the alarm circuits and the fire relays. Press to operate and press SILENCE ALARMS to silence.

Access Controls Keyswitch. Position "0" inhibits all the controls. Position "1" enables all the controls

1.1.3Display Printed Circuit Boards as Viewed from Inside Cabinet

EPROM WITH

SOFTWARE

REFERENCE

PROC RESET

NODE ADDRESS

DISPLAY

 

 

DIL SWITCH

 

 

 

 

 

 

 

B/+

CONNECT TO

 

 

 

MOTHERBOARD

 

 

 

A/-

 

 

PROC FAILED

SCN

FOR REPEATER

 

 

 

B/+

 

 

 

USE ONLY

 

COMMS FAILED

A/-

 

 

 

SCN

 

 

 

 

FLT

 

 

 

 

24V

24V AND 0V

 

 

 

0V

SUPPLY

 

 

 

 

PRINTER

ZONE BOARD DISABLE

ZONE BOARD

 

 

INTERFACE

 

 

MONITORING LINK

INTERFACE

 

 

 

 

 

1.1.5A1557 Motherboard Showing Essential Engineering Components

Document Ref: Nex8inst.doc/Rev0 09.07.00

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Nexus 21 A1557 technical specifications Display