154 Part G: Alarms © Tait Electronics Limited December 2007
Battery protection
mode
Battery protection mode is on. This happens when a base station is operating
on AC mains power, but the battery voltage is still below the configured
minimum. Battery protection mode requires a PMU with a standby converter.
If AC mains power fails when the PMU is in battery protection mode, the base
station shuts down instead of using battery power. This protects the battery.
1. The system has been operating on battery power; the battery has become
flat and AC mains is restored. No action required.
2. The battery is not being charged. Check the PMU’s auxiliary output line, if
it is being used for charging.
3. The battery is flat. Replace it.
4. The minimum battery voltage is set too high.
Output The PMU measures the voltage and the amperage of its DC output to the PA
and to the reciter.
Output voltage
high
The PMU’s DC output (nominally 28 V) is higher than the fixed maximum of
32 V.
Output voltage
low
The PMU’s DC output (nominally 28 V) is lower than the fixed minimum of
24 V.
Output current
high
The PMU is providing more than 15 A of current and is automatically limiting
its output, lowering the output voltage. There is a short circuit or the PMU is
faulty.
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