NX50 Troubleshooting Manual
Responding to alarms
Page 1-24
Issue 6.0 2019-04-01
Exciter A/B:
Precorrection Inhibited
This alarm indicates that the exciter has disabled its pre-correction
compensation. This alarm will occur because the transmitter’s B+
voltage is too low. See the troubleshooting action for the
associated low B+ voltage alarm.
Exciter A/B: Protection
Mechanisms Disabled
This alarm indicates that the exciter’s protection (shutback,
foldback, cutback) has been turned off by the user. The state
should only be required when calibrating the transmitter after a
frequency change. If this state is not intentional, press the reset
button on the associated digital AM exciter PWB. If the alarm
persists, replace the associated digital AM exciter PWB
(see
“Digital AM exciter PWB replacement” on page 1-66
Exciter A/B: Reboot for
Settings Needed
This alarm indicates that the exciter needs to reboot itself to
reconfigure its settings. The exciter should automatically reboot
itself, however if the alarm persists, press the reset button on the
associated digital AM exciter PWB. If the alarm persists, replace
the associated digital AM exciter PWB
Exciter A/B: RF Probes
Uncalibrated
This alarm indicates that the associated exciter has not been
calibrated for the transmitter’s current operating frequency. If the
operating frequency has been changed inadvertently, change the
frequency back to its original setting. If a frequency change has
been performed, recalibrate the exciter per the Nautel provided
frequency change procedure.
Exciter A/B: SWR
Foldback
This alarm indicates the average reflected power has exceeded
the acceptable limit, and the transmitter’s RF output is being
reduced to maintain the maximum acceptable reflected power.
This alarm normally occurs due to a poor impedance being
presented to the transmitter. Inspect the antenna network and
check the tuning to ensure the impedance being presented to the
transmitter is within specification.
Alarm (with Prefix)
Description and Troubleshooting Action
Содержание NX50
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