Nautel VX150, Руководство по устранению неисправностей, Страница: 39 / 182

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.31
SIB Communication Failure The System Interface PWB microcontroller has
failed to respond to at least 2 or more
consecutive attempts to poll parameter
values. When this alarm has been triggered
the transmitter will automatically enable
remote control via the AUI as communication
with the front panel buttons will not be
operational. This alarm will clear when the System
Interface PWB microcontroller provides a
response to all of its polled parameters in a
single attempt. This alarm is most likely caused by an
issue in the connection between the
Exciter and System Interface PWB. Check
this connection.
Verify the Green CPU OK LED is blinking
on the System Interface PWB.
Consider replacement of the System
Interface Board, contact Nautel Customer
Support.
Summary Fault The Summary Fault will trigger when any
system alarm is active. The Summary Fault will clear when there are
no active alarms. T he Summary Fault is not an alarm, but
instead provides a summary indication
that the system has active alarms. This
serves as a method if indication when
monitoring the transmitter via SNMP or
the Remote IO Interface.
Check the transmitters alarms via the
Front Panel UI or remote AUI.
SWR Cutback At least 5 SWR Shutbacks have occurred
within a 20 second period.
This alarm has 3 levels, representing power
reductions to 75%, 50%, and 25% of the
preset output power setpoint.
Every series of 5 Shutbacks will lead to a
transition to the next lower power reduction
level.
If Shutbacks continue at 25% of the setpoint
this will trigger an SWR Shutdown. This alarm will attempt to automatically clear
between 30 seconds and 6.5 minutes after
triggering depending on the level of cutback
reached.
Level 1 (75%) takes 30 seconds to clear
Level 2 (50%) takes 2 minutes to clear
Level 3 (25%) takes 4 minutes to clear
Timeouts are cumulative, meaning that each
level must be successfully cleared before
proceeding to the next. 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.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting