Nautel VX150, Troubleshooting Manual, Page: 36 / 182

RESPONDING TO ALARMS VX150 TO VX2 TROUBLESHOOTING MANUAL
PAGE 3.1.28 VERSION 2.0 2023-04-20
PA High Power Dissipation At least one PA Power Dissipation meter has
measured higher then 350W for at least 30
seconds.
This alarm will cause a foldback in transmitter
output power to limit PA power dissipation to
350W. All transmitter PA Power Dissipation meters
measure less than 350W and the transmitter
has returned to the preset output power
setpoint.
Performing an alarm reset will clear this
alarm. This alarm is most likely caused by
changes in load SWR. Check for the
Reflected Power and SWR meters to
observe any load changes that can effect
PA efficiency.
Check the transmitter cooling system as
PA efficiency decreases with
temperature.
Preset Error(s) A preset is loaded, either on startup or when
switching between presets, that contains at
least one element that is invalid. When a preset is loaded that has valid values
for all its components.
Performing an alarm reset will clear this
alarm. The likely cause is corruption of a stored
preset. Edit the preset to verify that all
the settings are correct.
A preset that was valid for a different
model transmitter has been loaded. Edit
the preset to adjust any invalid settings.
PS Fail The PA power supply has reported an internal
failure based on its own diagnostic criteria for
failure. This alarm is only cleared when the power
supply reports no failure. Check power supply LED's, a red fault or
orange maintenance LED indicate a need
for replacement.
A blinking green DC LED may suggest a
short circuit on the output of the power
supply, check PA(s) for short circuit
failure.
Remove, wait 30 seconds, and re-install
power supply.
PS Not Compatible The PA power supply has reported a comcode
(model) that is not compatible with this
system. The PA power supply reports a correct
comcode. The power supply installed does not
match the correct model for use in this
transmitter. The most likely cause is that
an off the shelf part was used as a
replacement.
Contact Nautel customer service for a
compatible replacement power supply.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting