Replacing The Battery; Battery Supervision; Battery Charging Circuit; Figure 10: Charging And Battery Leds - Bosch D9412GV2 Operation And Installation Manual

D9412GV2/D7412GV2 | Operation and Installation Guide | 5.0 Power Supply
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 D9412GV2/D7412GV2 Approved Applications
Compliance Guide (P/N: F01U003639) 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 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
communication format. It sends a TROUBLE ZN 9
report in the BFSK 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
communication format, or TROUBLE ZN 9 report in
the BFSK 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
communication format or a RESTORAL ZN 9 report in
the BFSK format. At 13.9 VDC, the yellow Charging
Status LED stops lighting.
26

Figure 10: Charging and Battery LEDs

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
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
2
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.
2
2
Bosch Security Systems, Inc. | 7/09 | F01U003641-04
LEDs Off When Normal
Charging Status
YEL
Low Battery
RED

Battery Charging Circuit