7.3.3
Operational Test
1. Activate the Alpha FXM self-test function.
2. After passing the self-test, disconnect the AC input to the Alpha FXM to trigger the Alpha FXM into the
backup (Inverter) mode.
3. Let the Alpha FXM operate in the backup mode for approximately 10 minutes.
4. Measure the individual battery voltages while the Alpha FXM is operating in the backup mode. There
should be no more than 0.6 volts difference between the highest battery voltage and the lowest battery
voltage.
CAUTION!
A battery that measures 2V lower than the other three batteries in the string probably has a shorted cell.
Replace all four batteries.
Three batteries in the string measuring the same voltage and one battery measuring several volts higher
indicates an open cell in the battery with the higher reading. Re- place all four batteries.
5. Verify that there is no Low Battery Alarm.
6. Reconnect the AC input.
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