Comtech EF Data XTD-400C Operation And Installation Manual page 73

Fault Log
Entry
HelixArc Heater Fault
HelxArc2 Momentary Helix Arc Fault on
2nd TWT in dual tube units
Hi Drv A Input Drive High Alarm:
Software Power Limit,
Constant Power
Hi Temp Over Temperature Fault from
thermocouple
Hi Temp2 Over Temperature Fault from
second thermocouple. (Dual
TWT units only)
MNC-0400-048
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Table 1TWTA Fault Log Troubleshooting
Description
9 of 14
Operation, TWTA ODU Amplifier
Possible Cause of
Fault
Overdriving TWT, a Make sure that the
Mal-functining TWT, input drive power is
or gassy TWT. not too high. Check
for perperly
connected
waveguide, and a
properly terminated
load. If TWT has
been in storage, run
unit in Standby for
several hours, then
try again.
Overdriving TWT, a Make sure the input
Mal-functioning drive power is not
TWT, or gassy TWT. too high. Check for
properly connected
waveguide, and a
properly terminated
load. If TWT has
been in storage, run
unit in Standby for
several hours, then
try again.
Too much input RF 1. Reduce input
drive power. drive power. 2.
Change output RF
power limit. 3.
Disable feature.
Measured Check cooling
temperature system for air
exceeds set limits. blockage and
properly operating
fans.
Measured Check cooling
temperature system for air
exceeds set limits. blockage and
properly operating
fans.
Action Needed to
Clear Fault
Revision B