NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-20 Issue 3.2 2014-12-10
Module #: IPA
Forward Shutdown
(Module LED = red) This alarm occurs if the IPA’s peak forward power
exceeds the AUI adjustable IPA Forward High threshold for the
operating mode and frequency by more than 10 W. The module will
be inhibited.
Module #: IPA Input
High
(Module LED = green/red) This alarm occurs if the input RF drive
(exciter power) is greater than the AUI adjustable high IPA input
threshold for the operating mode. This alarm occurs if the exciter ALC
cannot respond quickly enough to varying exciter load changes or if
the exciter’s output has increased or been incorrectly set to a very
high level.
Module #: IPA Input
Low
(Module LED = green/red) This alarm occurs if the input RF drive
(exciter power) is less than the AUI adjustable low IPA input threshold
for the operating mode. This may be the result of an exciter fault,
excessive load variation on the active exciter output, or defective
components on the RF drive splitter/changeover assembly.
Module #: Module
EEP Fault
(Module LED = green/red) There is no valid EEPROM data to load.
See “Operating with defective or missing RF power modules” on
page 1-27 to replace the affected module.
Module #: No Front
Panel
(Module LED = red/amber) The module has not received any serial
messages from the Controller for more than 2.5 seconds. This alarm
is only displayed as a log entry for the applicable module.
Module #: Output
Network Shutdown
This alarm occurs if the ratio of the highest PA 1 to 4 current versus
the highest PA 5 to 8 current exceeds 3.5:1. This indicates that the
module is operating into a high VSWR due to a transient arc or
combiner failure.
Module #: PA 1-8
DSBL
(Module LED = green/red) Due to other failures within the module, the
PA has been disabled to limit reject power in the module. Check for
associated alarm(s) that may have caused the failure and refer to
their troubleshooting action.
Module #: PA 1-8 Fail (Module LED = green/red) This alarm occurs if the dc input current for
the suspect PA has fallen below a preset threshold (typically less than
50% of the average PA current of the operational PAs). This may be
caused by a cabling fault on the PA, loss of PA voltage or bias, or a
defective FET. The transmitter’s output power may be reduced.
Alarm (with Prefix) Description and Troubleshooting Action
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