Comtech EF Data XTD-750C-B1 Operation And Installation Manual page 75

Fault Log
Entry
LHx Arc Latched Helix Arc Fault
LHx Arc2 Latched Helix Arc Fault on 2nd
TWT in dual tube units
Lo Drv A Input Drive Low Alarm:
Software Power Limit function,
Constant Power
Lowline Low-line Fault
LowPwr A Customer settable Low
Forward RF Power Alarm
LowPwr F Customer Settable Low
Forward RF Power Fault
MNC-0400-048
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Table 1TWTA Fault Log Troubleshooting
Description
11 of 14
Operation, TWTA ODU Amplifier
Possible Cause of
Fault
The maximum Check for properly
number of connected
Momentary Helix waveguide, and a
Arc faults has been properly terminated
detected. load. If TWT has
been in stroage, run
unit in Standby for
several hours, then
try again.
The maximum Check for properly
number of connected
Momentary Helix waveguide, and a
Arc faults has been properly terminated
detected. load. If TWT has
been instorage, run
unit in Standby for
several hours, then
try again.
Input Drive level is 1. Increase input
too low. drive power. 2.
Change output RF
power limit. 3.
Disable feature.
Input A/C power is Check A/C power
too low, or power input for proper
supply is failing. levels.
The output RF 1. Increase input
power is below the drive power. 2.
set minimum level. Change output RF
power minimum
level. 3. Disable
feature.
The output RF 1. Increase input
power is below the drive power. 2.
set minimum level. Change output RF
power minimum
level. 3. Disable
feature.
Action Needed to
Clear Fault
Revision B