Battery Supervision; Battery Charging Circuit; Battery Discharge/Recharge Schedule; Figure 6: Charging And Battery Leds - Bosch D9412G Operations & Installation Manual

D9412G/D7412G | Operation & Installation Guide |
4.2.4

Battery Supervision

When 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 Modem IIIa
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
2
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 darkens. If the panel is programmed for
power supervision, it transmits a Battery Restoral Report
2
in the Modem IIIa communication format or Restoral
Zn 9 Report in the BFSK format. At 13.9 VDC, the
charging status LED darkens.
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 VDC to 13.9 VDC at a maximum current of 1.4 A.
If float voltage drops below 13.5 VDC, the charging
status LED illuminates.
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. The red low battery
LED continues flashing 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.
Bosch Security Systems | 10/03 | 43488E
4.0 Power Supply
4.2.6

Table 9: Battery Discharge/Recharge Schedule

Discharge Cycle
2 communication
Rescharge Cycle

Figure 6: Charging and Battery LEDs

Battery Discharge/Recharge Schedule

AC Fail Report when AC fails if panel is
AC Off:
programmed to report AC failure at
occurrence.
13.9 VDC: Charging float level.
13.8 VDC: Charging status LED on.
12.1 VDC: Low Battery and AC Fail Reports if
programmed. Low battery LED on.
10.2 VDC: Battery load shed (processing functions
continue if AC is present).
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.
LEDs Off When Normal
YEL
RED
EN | 23
Charging Status
Low Battery