Nexus 21 A1557 - Manual (Page 3)

Document Ref: Nex8inst.doc/Rev0 09.07.00 Page 3 of 30 Originator MC Checked by AC__
1.1.3 Display Printed Circuit Boards as Viewed from Inside Cabinet
1.1.5 A1557 Motherboard Showing Essential Engineering Components
B/+
A/-
SCN
B/+
A/-
SCN
FLT
24V
0V
PROC RESET
NODE ADDRESS
DIL SWITCH
EPROM WITH
SOFTWARE
REFERENCE
PRINTER
INTERFACE ZONE BOARD DISABLE
MONITORING LINK
ZONE BOARD
INTERFACE
PROC FAILED
COMMS FAILED
CONNECT TO
MOTHERBOARD
FOR REPEATER
USE ONLY
24V AND 0V
SUPPLY
DISPLAY
System disabled
illuminated when
detectors or inputs
are isolated
LCD display
4 x 20 character line
to display 2 events
General fault
illuminates when
a general system
fault has occurred
Press to reveal
more messages on
the LCD display
Press to clear the
LCD display after
a fault has been
cleared.
System Reset
control. Press to
reset the system
after the Silence Alarms
has been pressed.
CLEAR SCROLL
EVACUATE ENTER
OVERRIDE
ESCAPE
ACCESS SILENCE
TEST TEST
SILENCE RESET
DISPLAY MESSAGES
DELAY
MENU BUZZER
ALARMS
DISPLAY ALARMS
SYSTEM
TEST
ON
HEALTHY
SUPPLY
ALERT
DELAY
ACCEPT
FIRE DISABLED
SYSTEM
FAULT
MORE
MESSAGES
GENERAL
FAULT
CONTROLS
ACCESS
6
5
4
3
2
1
*
#
0
9
8
7
Silence alarms
control. Press
to silence the
alarms.
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
Press to test the
alarm sounders.
Release to clear.
Press to access
engineers menu
via access code.
Press to override
the output delay.
Evacuate control operates
the alarm circuits and the
fire relays. Press to operate
and press SILENCE ALARMS
to silence.
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.
Illuminates when
there is a system fault.
Illuminates when
the panel is in
engineers test mode. Illuminates when
a device is in
an alert condition.
Illuminates when
the alarms and panel
outputs would be
delayed in the event
of a fire condition.
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.
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.
Access Controls Keyswitch.
Position "0" inhibits all the controls.
Position "1" enables all the controls