TB8100 Service Kit User’s Manual Monitoring Alarms 153
Power Management Unit
The Power Management Unit area shows the alarm status of the PMU that
supplies the base station with power.
No PMU detected The reciter is unable to detect the PMU on the control bus. In subracks with
more than one reciter, only reciter 1 can communicate with the PMU. For
reciters other than reciter 1, this alarm should be disabled. There may be a fault
or the PMU may still be operating satisfactorily. However, the system has lost
the ability to monitor PMU alarms, carry out diagnostics, change configuration,
or detect PMU fan failure. Power saving is disabled.
Fan failed The PMU told the reciter that its fan is on, but the reciter cannot detect fan
motion. The base station takes no action when this alarm occurs, but it will act
if the PMU temperature becomes too high.
The fan has failed. Replace it.
Shutdown
imminent
This alarm only appears if the PMU has a DC-DC converter and a Standby
converter. A battery is currently being used to power the base station and its
voltage has fallen to the absolute minimum. The PMU will stop operating 30
seconds after activating this alarm.
The main value of this alarm is as an input for Task Manager actions
. You can,
for example, have the base station send the alarm log
just before shutting down.
Mains supply
failed
The AC mains power supply to the PMU is absent or its voltage is outside
acceptable limits. The PMU is using DC power from its battery source.
Power up fault The PMU has detected an internal error and will reset itself. If the reset is
successful, the alarm will clear.
Temperature high One of the PMU temperature sensors has detected a temperature that is above
the fixed limit.
Battery The PMU measures the voltage of its battery input.
Battery voltage
high
The PMU’s battery voltage is higher than the configured maximum. The base
station takes no action until the voltage reaches the fixed maximum, when it
shuts down.
Battery voltage
low
The battery voltage is below one of the configured minimums. (There are two
configurable minimum battery voltages, one for when the PA is transmitting
and the other for when it is idle.) If the voltage falls further so that it is below
the Power shutdown voltage (Configure > Base Station > Miscellaneous), the
PMU will shut down to protect the battery.
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