MNC-0400-048
10 of 14
Revision B
Operation, TWTA ODU Amplifier
HighPwrA Customer Settable High
Forward RF Power Alarm
The output RF
power exceeds the
set limit.
1. Increase RF
output limit. 2.
Lower input drive
power. 3. Increase
attenuation. 4.
Disable feature.
HighPwrF
Customer Settable High
Forward RF Power Fault
The output RF
power exceeds the
set limit.
1. Increase RF
output limit. 2.
Lower input drive
power. 3. Increase
attenuation. 4.
Disable feature.
HiTempA
Over Temperature Alarm from
thermocouple
Measured
tmeperature
exceeds set limits.
Check cooling
system for air
blockage and
properly operating
fans.
HV Over
High-Voltage Over Fault
The Voltage level
applied to the TWT
exceeds max limit.
Call customer
service.
HV Under
High-Voltage Under Fault
The Voltage level
applied to the TWT
failed come up to
minimum levels.
Call customer
service.
HV2 Over
High-Voltage Over Fault for
TWT 2 in dual tube units
The Voltage level
applied to the TWT
exceeds max limit.
Call customer
service.
HV2 Under High-Voltage Under Fault for
TWT 2 in dual tube units
The Voltage level
applied to the TWT
failed come up to
minimum levels.
Call customer
service.
Table 1TWTA Fault Log Troubleshooting
Fault Log
Entry
Description
Possible Cause of
Fault
Action Needed to
Clear Fault
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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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