RESPONDING TO ALARMS VX150 TO VX2 TROUBLESHOOTING MANUAL
PAGE 3.1.22 VERSION 2.0 2023-04-20
Invalid License(s) At least one invalid or corrupt license has
been detected during the configuration of the
Exciter PWB.
No invalid or corrupt licenses have been
detected during the configuration of the
Exciter PWB.
Damaged or corrupt license file. Contact
Nautel about restoring the license file.
Replacing the System Interface PWB will
invalidate the current license file. Contact
Nautel to obtain a new license file.
IPA Bias Fail During the Autobias routine the IPA bias
current target was not achieved within the
required time or DC bias voltage range.
This alarm is cleared by starting the Autobias
routine.
Performing an alarm reset will clear this
alarm.
Check the IPA connections, fuse, and
FET.
Attempt to operate the transmitter at
minimum power. If the Low Forward
Power or Low RF Drive alarms are
triggered, then consider replacing the
IPA. See
Pre-Amplifier/IPA PWB
Replacement on page 3.1.65.
IPA Fail The IPA current is less than 200mA when RF is
ON, or the IPA voltage sample is less than 9.6
volts.
This alarm must be cleared by performing an
alarm reset in the Front Panel UI, AUI, or via
the transmitters discrete remote I/O.
Check the IPA connections, fuse, and
FET.
Attempt to operate the transmitter at
minimum power. If the Low Forward
Power or Low RF Drive alarms are
triggered, then consider replacing the
IPA. See
Pre-Amplifier/IPA PWB
Replacement on page 3.1.65.
Low Ac Input The Ac Voltage meter is less than 185 Vac in a
VX1.5 or VX2 model.
The Ac Voltage meter is greater than 185 Vac
in a VX1.5 or VX2 model.
The AC Voltage meter is greater than 90 Vac
in a VX150 to VX1 model.
The most likely cause for this alarm is a
phase failure or brownout on the Ac
supply to the transmitter.
Check the Ac supply voltage at the
transmitter connection.
Connect the transmitter to a suitable
supply greater than 185 Vac.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting
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