Battery Supervision; Battery Charging Circuit - Radionics D9412G Operation And Installation Manual

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 Radionics' Modem IIIa
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
Radionics' Modem IIIa
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 Radionics' Modem IIIa
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 amps. 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 volts 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 amps 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 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.
© 2002 Radionics
2 Communication Format. It transmits a TROUBLE ZN 9 report in the BFSK
2 Communication Format, or TROUBLE ZN 9 report in the BFSK format.
D9412G/D7412G Operation & Installation Guide
Page 27
D9412G/D7412G
Power Supply
2
Communication Format or
43488D