VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.33
SWR Shutdown The VSWR meter value is greater then 3.0:1.
This will immediately trigger a shutdown and
inhibit the transmitters RF output.
This threshold can be adjusted between 1.1
and 1.5:1 SWR in the transmitter settings
page of the Front Panel User Interface.
This alarm must be cleared by performing an
alarm reset in the Front Panel UI, AUI, or via
the transmitters discrete remote I/O.
This alarm is most likely caused by an
issue in the output transmission line or
antenna system.
Check for faults in transmission line or
the antenna system, measure load SWR
at the transmitter output.
SWR Shutdown will often follow SWR
foldback as SWR increases past the
shutdown threshold.
Be cautious when adjusting the SWR
shutdown threshold, as directivity error is
pronounced when measuring low SWR
and may cause premature shutdown.
System Controller Interlock The interlock connection on the System
Controller Interface has been opened.
This alarm presents identical behavior to the
“External Interlock” Alarm. When enabled the
System Controller Interlock acts in series with
the External Interlock.
The Transmitter must be set up as an N+1
system using a Nautel System Controller for
this alarm to appear.
The Interlock connection on the System
Controller Interface is closed.
This alarm is only applicable to N+1
systems using a Nautel System
Controller.
If this alarm is present, it’s most likely the
System Controller is inhibiting the
transmitter. Check the System Controller
status and alarms.
Very Low Forward Power The Forward Power meter value is below the
Very Low Forward Power Threshold for at least
1 second. The default value for this alarm to
trigger is 12.5% of the Output Power Setpoint
in the active preset.
The threshold can be adjusted by the user in
the AUI or Front Panel User Interface.
No action is taken on this alarm.
This alarm will suppress the Low Forward
Power alarm when triggered.
The Forward Power meter value is above the
Very Low Forward Power Threshold for at least
1 second.
Check for other transmitter alarms, this
alarm serves as a general indicator
resulting from any severe reduction of
Transmitter Forward Power.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting
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