MNC-0400-048 12 of 14 Revision B
Operation, TWTA ODU Amplifier
F = Fault; turns high voltage off.
MISPHA F Missing Phase. One of the phases
of the 3-phase A/C
input is missing.
Verify A/C wiring to
unit.
Ovrdrv A Input Over Drive Alarm
reported by Power Supply.
Input drive level is
too high.
Lower input drive
level.
Ovrdrv F Latched Input Over Drive Fault
reported by Power Supply
Input drive level is
too high.
Lower input drive
level.
PHASEQ F Phase Sequence Fault: The three phases of
the 3-phase A/C
input are wired
incorrectly.
Re-wire A/C power
cable.
PWR MTCH RF Power Mismatch Fault on
dual tube units
The two TWT’s are
out of phase with
each other.
Call customer
service.
PwrLim F Software Power Limit Fault The RF output
power has
exceeded the set
power limit.
1. Change the RF
Limit. 2. Reduce the
input drive level. 3.
Change the amount
of attenuation that
can be added
before a fault
occurs. 4. Disable
the feature.
RfltPwrA Customer Settable High
Reverse RF Power Alarm
The reflected RF
power level
exceeds the limit
set.
Check for properly
connected
waveguide, and a
properly terminated
load.
RfltPwrF Customer Settable High
Reverse RF Power Fault
The reflected RF
power level
exceeds the limit
set.
Check for properly
connected
waveguide, and a
properly terminated
load.
Thrm2IlK TWT Thermal Interlock for
TWT 2 in dual tube units
The TWT
temperature has
exceeded the
manufacturer’s max
level.
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.
To Next Page
Loading...