Installation Guide

D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 5.0 Power Supply
Bosch Security Systems, Inc. | 3/12 | F01U266054-01 27
5.2.3 Replacing the Battery
Replace batteries every 3 to 5 years under normal
use. Record the date of installation directly on
the battery.
Caution: Exceeding the maximum
output ratings or installing the
transformer in an outlet that is
routinely switched off causes heavy
discharges. Routine heavy discharges
can lead to premature battery failure.
D8132 Boost Battery Backup: Adding a D8132
Battery Charger Module supports additional
batteries of up to 27 Ah capacity, if required.
The control panel, plus any connected D8132
Modules and auxiliary power supplies, must be
on the same AC circuit to discharge evenly if AC
power fails. The number of D8132 Modules is
determined by the number of available outlets on
the same circuit. Refer to the Standby Battery and
Current Rating Chart in the
D9412GV4/D7412GV4/D7212GV4 Approved
Applications Compliance Guide (P/N:
F01U201525) for battery standby time
calculations.
5.2.4 Battery Supervision
When battery voltage drops to 13.8 VDC, the
yellow Charging Status LED illuminates. When the
battery voltage drops to 12.0 VDC to 11.8 VDC,
the red Low Battery LED lights, and the keypad
or keypads display SERVC LOW BATT. The
control panel (if programmed for power
supervision) sends a BATTERY LOW report in the
Modem IIIa
2
communication format. It sends a
Low System Battery (302) report in the Contact
ID format.
If the battery is missing or shorted, the red Low
Battery LED flashes at the same rate as the green
Operation Monitor LED. If the control panel is
programmed for power supervision, it sends a
BATTERY MISSING report in the Modem IIIa
2
communication format, or Control Panel Battery
Missing (311) report in the Contact ID format.
When battery voltage returns to 13.7 VDC, the
Low Battery LED turns off and the keypad or
keypads clear the SERVC LOW BATT message. If
the control panel is programmed for power
supervision, it sends a BATTERY RESTORAL
report in the Modem IIIa
2
communication format
or a Control Panel Battery Restored to Normal
(302) report in the Contact ID format. At 13.9
VDC, the yellow Charging Status LED stops
lighting.
Figure 8: Charging and Battery LEDs
LEDs Off When Normal
YELLOW - Charging Status
RED - Lo w Bat tery - 12.1 VDC
10.2 VDC - Battery Load Shed
Investigate Low Battery reports immediately: If
primary (AC) power is off and the discharge
continues, the control panel becomes inoperative
when the battery voltage drops below 10.2 VDC.
5.2.5 Battery Charging Circuit
Float Charge
The float voltage for the battery charging circuit
is
13.9 VDC at a maximum current of 1.4 A, less any
devices connected to the control panel. If the
float voltage drops below 13.8 VDC due to
overload or battery discharge, the yellow
Charging Status LED lights.
Loss of AC Load Shed Relay protects battery:
During an AC power loss, the battery supplies all
power to the security system. If the battery
voltage falls below 10.0 V during an AC power
loss, a load shed relay isolates the battery from
the control panel and disables the control panel.
Load shed protects the battery from being
damaged by deep discharge. When AC power
restores, the load shed relay reconnects the
charging circuit on the control panel to the
battery and the battery begins to recharge.