
Installation
and
Operation
Manual
11
PCU
Provide
power
supply
output
to
the
system
(AMI,
ALU,
NOU,
ROU,
XNU,
Addressable
Loop
Circuits,
Notification
Appliance
Circuits,
Relay
output,
Network
circuits).
Terminals
BAT+
and
BAT
‐
connect
two
lead
‐
acid
batteries
(12VDC)
in
series.
Maximum
Charge
Voltage:
27.8
VDC
Maximum
Charge
Current:
3A.
Sufficient
battery
charging
capability
is
available
to
charge
40AH
sealed
lead
‐
acid
batteries
within
code
requirements
for
up
to
24
hours
standby
plus
30
minutes
alarm.
Use
a
microprocessor
‐
controlled
transfer
circuit
to
switch
power
supply
for
the
system
to
standby
batteries
when
AC
power
is
off
or
low.
Communicate
to
the
AMI
to
report
fault
conditions.
PCU
address
is
set
by
the
rotary
switch
on
the
board.
The
default
is
"1".
Figure
7
PCU
The
PCU
must
be
set
to
a
correct
address
before
use.
Please
refer
to
Unit
Address
Setting
section
for
detail.