Comtech EF Data XTRT-400C Operation And Installation Manual page 112

Note: RF related faults are generated in the RF chain. These faults are designed to protect the TWT and
the rest of the RF chain from damage.
VSWR Fault – When the amplifier senses a mismatch on the RF output in excess of a 2:1
VSWR. Check waveguide tightness and input VSWR of the RF load on the amplifier.
W/G Arc Fault – When an internal detector senses an arc in the waveguide. This fault
will inhibit the RF then turn off the high voltage to the TWT. In most cases this fault will
require service as waveguide arcs will usually tend to deposit carbon traces on the
internal surfaces of the waveguide.
WARNING- Resetting these faults excessively could cause damage to the TWT.
Overdrive Fault – When the amplifier senses a RF overdrive condition. This fault is only
present in amplifiers with peak power TWT's.
Upconverter Fault – This fault occurs when an integrated up-converter looses lock
signal. This is usually an indication of a loss of the reference oscillator signal. Some
Xicom XTRT series amplifiers have integrated 10 MHz oscillators while others are
configured to use an external source. If an external oscillator is required check integrity
of the signal at the input of the amplifier. This fault is only present in amplifiers with
integrated up-converters.
Interlock faults are generated by a contact closure (or lack thereof) in internal or external circuitry.
Cover Interlock Fault – Indicates an internal cover switch is open.
External Interlock Fault – Indicates the external interlock pins 11-13 connection on the
auxiliary interface connector on the rear panel is open.
Software selectable faults are generated by setting a fault or alarm level in the set-up menu as
described in the section of this chapter entitled "SETUP".
Maximum Power Alarm/Fault – Indicates the RF power out has exceeded the threshold
of the level selected.
Minimum Power Alarm/Fault –Indicates the RF power out has fallen below the
threshold of the level selected.
Maximum Reverse Power Alarm/Fault - Indicates the reflected RF power has exceeded
the threshold of the level selected.
Clearing Alarms and Faults
See "Amplifier Tab" (page 17) for information about clearing alarms and faults.
MNC-0400-071
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to the U.S. Export Administration Regulations (EAR). Transfer of data herein by any means to a Foreign Person,
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Operation
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