Battery Charging Circuit; Battery Discharge And Recharge Schedule; Figure 7: Charging And Battery Leds; Ground Fault Impedance Specifications 15 Battery Discharge And Recharge Schedule - Bosch D7212GV3 Operation And Installation Manual

D7212GV3 | Operation and Installation Guide | 5.0
Figure 7: Charging and Battery LEDs
L EDs Off When No rmal
10.2 VD C - Battery Load Sh ed
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 1.4A, 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.
Overcharge Load Shed With AC Present: If more
than 1.4 A of auxiliary current draw from the control
panel occurs, the battery supplies the current and
begins to discharge. If this situation is not corrected,
the battery continues to discharge and at 11.8 VDC to
12.0 VDC, the keypads display Serv Low Batt.
22
YELLOW - Ch arg ing Statu s
RED - Low Battery - 12.1 VDC
Power Supply
When the battery voltage drops below 10.0 VDC, the
control panel shuts down. Remove all loads to the
control panel and disconnect AC power. Resolve the
over current problem. Add a new battery and
reconnect AC power.
Reset the control panel by momentarily placing the
reset pin in the disable position. Refer to Figure 4 on
page 16. The red Low Battery LED continues flashing
until the control panel resets.
A shorted battery condition is created either by a
shorted cell inside the battery or by a short on
Terminals 4 and 5. A shorted battery might cause the
control panel to operate in an unsafe way. This
condition generates WATCHDOG RESET reports.
5.2.6

Battery Discharge and Recharge Schedule

Table 6: Battery Discharge and Recharge
Schedule
Discharge Cycle
AC Off: AC Fail Report when AC fails, if
control panel is programmed to report
AC failure at occurrence.
13.9 VDC: Charging float level.
13.8 VDC: Charging status LED on.
12.0 VDC: Low Battery and AC Fail Reports if
programmed. Low battery LED on.
< 10.0 VDC:
Battery load shed (processing
functions continue if AC is present).
Recharge Cycle
AC On: Load shed relay reset; battery
charging begins; Battery Trouble and
AC Restoral Reports sent.
13.7 VDC: Battery Restoral Reports sent. Low
battery LED off.
13.9 VDC: Changing status LED off; battery float
charged.
Bosch Security Systems, Inc. | 10/10 | F01U143079-03