Comtech EF Data XTRT-400C-BUC Operation And Installation Manual page 111

Fault Mode
Faults on Xicom XTRT series amplifiers can be separated in three separate categories':
•
Power supply related faults
•
RF related faults
•
Interlock faults
•
Software selectable faults
Note: Power supply faults are generated by the high voltage power supply and cannot be over-ridden.
These faults are specifically designed to protect the TWT from damage.
Lowline Fault – When the power supply detects a low input line voltage. This is usually
the case of a broken power factor correction circuit; however, the input AC line voltage
should be checked to verify proper voltage to the amplifier. This is a self clearing fault
such that momentary brown-outs will not latch the amplifier in a non-operational mode.
Helix Current Fault (latched) – When the power supply detects excessive helix current
on the TWT, it turns off the high voltage and then tries to turn it back on. If the fault
persists for three OFF/ON cycles, the fault circuit latches and the high voltage power
supply stops automatically recycling.
High Voltage Overvoltage – When the high voltage is being applied to the TWT an
overshoot of significant duration has occurred.
High Voltage Undervoltage – When the high voltage is being applied to the TWT the
proper voltage is not achieved.
TWT Over-temperature – During operation the TWT achieves a temperature unsafe for
continued operation. The over-temperature fault will turn off high voltage which will
consequentially allow the TWT to cool. When the TWT has cooled to a safe operating
temperature the high voltage will be restored.
Note: An over-temperature fault should be cause for immediate maintenance action as it is a possible
indication of a fan failure or blocked air passage(s).
MNC-0400-071
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Operation
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