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D7212G Operation and Installation Guide
D7212G
Page 27© 2003 Bosch Security Systems 4998138544C
4.2.4 Battery Supervision
When the battery voltage drops to 13.8 VDC, the yellow Charging Status LED lights. When the battery drops to 12.1 VDC,
the red Low Battery LED lights and the panel, if programmed for power supervision, transmits a BATTERY LOW report in
the Bosch Security Systems Modem IIIa
2
Communication Format. It transmits 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 panel is programmed for power supervision, it transmits a BATTERY MISSING report in the Bosch Security Systems
Modem IIIa
2
Communication Format, or TROUBLE ZN 9 report in the BFSK format.
When battery voltage returns to 13.7 VDC the Low Battery LED goes out. If the panel is programmed for power
supervision, it transmits a BATTERY RESTORAL report in the Bosch Security Systems Modem IIIa
2
Communication
Format or RESTORAL ZN 9 report in the BFSK format. At 13.9 VDC the Charging Status LED goes out.
Investigate low battery reports immediately: If primary (AC) power is off and the discharge continues, the panel becomes
inoperative when the battery voltage drops below 10.2 VDC.
4.2.5 Battery Charging Circuit
Float Charge
The float voltage for the battery charging circuit is 13.5 to 13.9 VDC at a maximum current of 1.4 A. If float voltage drops
lower than 13.5 VDC, the Charging Status LED will illuminate.
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 10.2 V during an AC power loss, a “load shed” relay isolates the battery from the panel and
disables the panel. Load shed protects the battery from being damaged by deep discharge. When AC power restores, the load
shed relay resets and battery voltage is again available.
Overcharge Load Shed With AC Present: If more than 1.4 A of current draw from the panel is detected, the panel shuts down.
Remove all loads to the panel and disconnect AC power. Add a new battery and reconnect AC power.
Reset the panel by momentarily placing the reset pin in the disable position. See Figure 4 on page 22. The red Low Battery
LED continues to flash until the panel is reset.
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 may generate WATCHDOG RESET reports.
4.2.6 Battery Discharge/Recharge Schedule
Discharge Cycle Discharge Cycle
AC OFF AC fail report when AC fails if
panel is programmed to report
AC failure at occurrence.
AC ON Load shed relay resets, battery
charging begins, battery trouble
and AC restoral reports sent.
13.9 VDC Charging float level. 13.7 VDC Battery restoral reports sent, Low
Battery LED off.
13.8 VDC Charging Status LED on. 13.9 VDC Charging Status LED off, battery
float charged.
12.1 VDC Low Battery & AC fail reports if
programmed; Low Battery LED
on.
10.2 VDC Battery load shed (processing
functions continue if AC is
present).
Table 7: Battery Discharge/Recharge Schedule
Power Supply