MNC-0400-048
9 of 14
Revision B
Operation, TWTA ODU Amplifier
HelixArc
Heater Fault
Overdriving TWT, a
Mal-functining TWT,
or gassy TWT.
Make sure that the
input drive power is
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.
HelxArc2
Momentary Helix Arc Fault on
2nd TWT in dual tube units
Overdriving TWT, a
Mal-functioning
TWT, or gassy TWT.
Make sure the input
drive power is not
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.
Hi Drv A
Input Drive High Alarm:
Software Power Limit,
Constant Power
Too much input RF
drive power.
1. Reduce input
drive power. 2.
Change output RF
power limit. 3.
Disable feature.
Hi Temp
Over Temperature Fault from
thermocouple
Measured
temperature
exceeds set limits.
Check cooling
system for air
blockage and
properly operating
fans.
Hi Temp2
Over Temperature Fault from
second thermocouple. (Dual
TWT units only)
Measured
temperature
exceeds set limits.
Check cooling
system for air
blockage and
properly operating
fans.
Table 1TWTA Fault Log Troubleshooting
Fault Log
Entry
Description
Possible Cause of
Fault
Action Needed to
Clear Fault
EAR EXPORT CONTROLLED: The information contained in this Manual refers or relates to a product that is subject
to the U.S. Export Administration Regulations (EAR). Transfer of data herein by any means to a Foreign Person,
whether in the U.S. or abroad, may require an export license from the U.S. Department of Commerce.
