D9412GV2/D7412GV2 Operation and Installation Guide 5.0 Power Supply
5.2.4Battery 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 IIIa2 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 IIIa2 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 IIIa2 communication format or a RESTORAL ZN 9 report in the BFSK format. At 13.9 VDC, the yellow Charging Status LED stops lighting.
Figure 6: Charging and Battery LEDs
LEDs Off When Normal
YEL Charging Status
RED Low Battery
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.
5.2.5Battery Charging Circuit Float Charge
The float voltage for the battery charging circuit is
13.9VDC 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.
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.
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. 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 17. 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.
5.2.6Battery Discharge and Recharge Schedule
Table 7: 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. 5/05 F01U003641B | 23 |
