Nexus 21 A1557 technical specifications Lithium Battery, LBAR1

Field terminals

J14

keyboard

port

Aux Fire

Aux Flt

Aux

I/O

Repeater

Remote inputs

Alarm

Alarm

n

Network

Loop1

Loop 2

n n p

n n p

p

n

n

2

0

m m

r r

r r

s r e

s c f

1

2

n

n n

l l

l l

l l

l l

0

c

1

o

c

2

o

4

x

x

o

0

i

i

a

s

v

b

o

l

+

-

+

-

o

o

i

i

o

o

i

i

o

o

i

i

c

v

+

1

1

2

2

v

+

-

+

-

+

-

l

t

c

z

v

t

-

+

-

+

-

+

-

+

-

+

-

Fuse8

24V 1A

D0+

DO-

J5 - PC port

24v

Fuse 7

0v

Display

24V 1A

B1 - Lithium

U2 EPROM

terminals

clock battery

LBAR2

J3

J12 remove if

[jumper

[See alarm list]

not fitted]

Fuse 9 24V 3A

zone board

monitoring

Fuse 10

required

LBAR1

24v 3A

0v

5v

[See alarm list]

Proc

24v

0

2

8

f

on

A

B

C

N

failed

4

l

v

v

2

8

0

v

t

off

4

v

v

v

J9 Buzzer

Processor, display

SW 1

Silence

Silence

Test

enable

Loop power

alarms

buzr

alarms

power and common

Configuration

Reset

Local

Test

from PSU

fault from PSU

switches

system

evac

lamps

J6 - Network

J8- Loop 2

card slot

card slot

LBAR 1 Alarm List.

LBAR2 Alarm List.

J7- Loop 1

card slot

Comm failed.

Net enable.

Fire.

LP1 enable.

Alert.

LP2 enable.

Fault.

LP3 enable.

Isolated.

LP4 enable.

Supply fault.

LP5 enable.

Alarm fault.

LP6 enable.

Sil alarms.

LP7 enable.

Sil buzzer.

LP8 enable.

Sys reset.

!

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.

A1549 zone board interface

J4 A1558 expansion

board interface

Power for

loop

expansion

board

Document Ref: Nex8inst.doc/Rev0 09.07.00 Page 4 of 30 Originator MC Checked by AC__