Bentel Security B3G-220, Installation Manual

Page: 22 / 64

22 Universal Cellular Communicator
Power Monitor
The device can be powered in the following ways:
1. by the burglar alarm panel, equipped with a backup battery, in which case the communicator must operate at voltages in the
range 10.7 to 27.6 V.
2. by an external 12 V power supply, in which case the power supply must recharge the communicator's optional backup battery
(8 hours of operation following primary power outage).
In both cases, the battery ensures that the communicator is still operational in case of power failure.
The power and battery voltages are supervised so that the communicator can report the following events:
 Power fault/restore event.

Power fault/restore message (voice / SMS / message to the IP receivers).
Since the device can operate with or without an external backup battery (without input current limitation), the following two scenarios
correspond to a power failure.
Power voltage check
The power voltage will be supervised to detect problems. The voltage is checked every 100 ms. The following conditions apply to
the device without external backup battery:

Power problem event: when the voltage drops below 10 V (the PSTN interface is turned off).

Power problem restore: when the voltage rises above 12 V.

Start Energy Save mode: when the voltage drops below 9 V (the USB interface and the radio module are turned off).

Quit Energy Save mode: when the voltage rises above 10.7 V.

When the communicator is in Energy Save mode, the current draw does not exceed 175 mA. The maximum current
consumption, in Energy Save mode with battery connected and no action in progress is around 70 mA and is less than 150 mA
during voice calls.
Battery voltage check
The battery voltage will be supervised to check for any faults and that the battery itself is present. The voltage is checked every
100 ms. The value is processed (mean of values) to eliminate peaks. The following conditions apply to the device with external
backup battery:

Battery problem event: when the battery voltage drops below 3.4 V.

Battery problem restore: when the battery voltage rises above 3.7 V.

Start Energy Save mode: when the battery voltage drops below 3.2 V.

Quit Energy Save mode: when the battery voltage rises above 3.4 V.

Battery disconnected event: when the battery voltage drops below 2.0 V.

Battery disconnected restore: when the battery voltage rises above 2.0 V.

Battery overload event: when the battery voltage rises above 4.4 V.

Battery overcharge restore: when the battery voltage drops below 4.3 V.

When the communicator is powered ONLY by the battery, you can NOT use the USB port.