MNC-0400-048
13 of 14
Revision B
Operation, TWTA ODU Amplifier
Table 1 TWT Fault Log Troubleshooting
Fault Log
Engry
Description
Possible Cause of
Fault
Action Needed to
Clear Fault
Tub ILOK
TWT Thermal Interlock Fault
The TWT
temperature has
exceeded that
manufacturer’s max
level.
Check cooling
system for air
blockage and
properly operating
fans.
Twt Temp
TWT Temperature Fault
The measured TWT
temperature
exceeds the set
limit.
Check cooling
system for air
blockage and
properly operating
fans.
Twt1 Tmp
TWT Temperature Fault for
TWT 1 in dual tube units.
The measured TWT
temperature
exceeds the set
limit.
Check cooling
system for air
blockage and
properly operating
fans.
Twt2 Tmp
TWT Temperature Fault for
TWT 2 i dual tube units.
The measured TWT
temperature
exceeds the set
limit.
Check cooling
system for air
blockage and
properly operating
fans.
UC Fault
Upconverter Fault
The block-
upconverter is
reporting a fault.
Check that the
reference signal is
connected and at
the right power leel.
VSWR FLT
Factory Set Reverse RF Power
Fault
The RF output
power has
exceeded the
manufacturer’s
power limit.
Check for properly
connected
waveguide, and a
properly terminated
load.
WgArc 1
Waveguide Arc Fault 1 on a
multi-waveguide arc
configuration.
A waveguide arc
was detected before
the isolator.
Check for properly
connected
waveguide, and a
properly terminated
load.
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