Battery Charging Circuit; Battery Discharge/Recharge Schedule; (No Ac Power) - Radionics D7212 Operation And Installation Manual

Battery Supervision (Continued)
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
Modem II transmission format or RESTORAL ZN 9 report in the BFSK format. At 13.9
VDC the Charging Status LED goes out.
Investigate low battery reports right away : If primary (AC) power is off and the
discharge continues, the panel becomes inoperative when the battery voltage drops below
10.2 VDC.

Battery Charging Circuit

Float Charge
The float voltage for the battery charging circuit is 13.9 VDC at a maximum current of 1.4
Amps. Deduct any continuous load for devices connected to the panel from 1.4 Amps to
find the actual current available for charging.
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.
Reset or power down required for shorted battery: If the D7212 determines the battery
is shorted, it uses the load shed relay to disconnect the battery. You must reset or power
down the panel after correcting the problem to reset the load shed relay and reconnect the
battery.
Reset the panel by momentarily placing the reset pin in the disable position. See Figure 3.
The red Low Battery LED continues to flash until you reset the panel.
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.
Battery Discharge/Recharge Schedule (No AC Power)
Discharge Cycle
AC OFF
13.9 VDC
13.8 VDC
12.1 VDC
10.2 VDC
Recharge Cycle
AC ON
13.7 VDC
13.9 VDC
74-06913-000-B 2/96
AC fail report when AC fails if panel is programmed to report AC failure at
occurrence.
Charging float level
Charging Status LED on
Low Battery & AC fail reports if programmed; Low Battery LED on
Battery load shed (processing functions continue if AC is present)
Load shed relay resets, battery charging begins, battery trouble and
AC restoral reports sent.
Battery restoral reports sent, Low Battery LED off
Charging Status LED off, battery float charged
D7212 Operation & Installation Manual
Page 20
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