Tait TB8100 User Manual page 164

Battery protection
mode
Output
Output voltage
high
Output voltage
low
Output current
high
154 Part G: Alarms
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.
The PMU measures the voltage and the amperage of its DC output to the PA
and to the reciter.
The PMU's DC output (nominally 28 V) is higher than the fixed maximum of
32 V.
The PMU's DC output (nominally 28 V) is lower than the fixed minimum of
24 V.
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.
© Tait Electronics Limited December 2007