Tait TB8100, User Manual

Page: 161 / 254

TB8100 Service Kit User’s Manual
Monitoring Alarms 151
Current
The Current group of alarms detects excessive or inappropriate current draw.
If an alarm shows red, the PA needs servicing.
Supply voltage The PA can detect whether its power supply voltage is too high or too low.
Supply voltage
high
The PA supply voltage is 29 V or more.
1. The third party power supply is incorrectly configured.
2. A voltage regulator has failed.
Note: The base station is not type-approved for operation when the
supply voltage is outside the specified range.
Supply voltage
low
The PA supply voltage is 26 V or less, probably because the battery is running
low. The fault condition disappears when the voltage exceeds 26.1 V.
Temperature high
This group of alarms shows whether the temperature in the driver, Final 1, or
Final 2 output stage has exceeded the configured threshold. If a temperature
exceeds a built-in limit, the PA folds back its power output until the
temperature is within the normal range.
To see the actual temperatures, select Diagnose > Power Amplifier > Control
Tests.
System
The System area displays alarms that are triggered by system conditions. These
alarms do not indicate base station faults. You can set a threshold for these
alarms if this is appropriate for your system. For example, if the base station
should always receive a signal on the balanced input, you can set a threshold so
that the alarm is triggered if the signal fails. Otherwise leave the threshold at
zero, so that the alarm is never triggered.
Alarm Description
Driver high The driver is drawing excessive current. A fixed limit has been
exceeded.
Final 1 The Final 1 output stage is drawing excessive current. A fixed
limit has been exceeded.
Final 2 The Final 2 is drawing excessive current. A fixed limit has been
exceeded.
Imbalance One of the final stages is drawing significantly more current
than the other.