D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 5.0 Power Supply
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Bosch Security Systems, Inc. | 7/16 | F01U265457-09 32
When AC power restores, the load shed output
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, SERV
LOW BATT appears on the keypad display.
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.
Fix the condition creating the over current. Add a
new battery and reconnect AC power.
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.
Reset the control panel by momentarily placing
the reset pin in the disable position. Refer to
Figure 4 on page 22. The red Low Battery LED
continues flashing until the control panel resets.
5.2.6 Battery Discharge and Recharge Schedule
Table 8: 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.
<
Ω 10.0
VDC:
Battery load shed (processing functions continue if AC is present).
Recharge Cycle
AC On:
Load shed output 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.
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