NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-9
Controller: EEP Fail
Meter Scales
This alarm occurs if there is no valid EEPROM meter scale data to
load. All calibrated meter scales will revert back to their failsafe
default values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: EEP Fail
Module Thresholds
This alarm occurs if there is no valid EEPROM module threshold data
to load. All module threshold values will revert back to their failsafe
default values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: EEP Fail
Remotes
This alarm occurs if there is no valid EEPROM remote data to load.
All configurable remote input/output settings will revert back to their
failsafe default settings. See “Controller: EEP Fail alarms” on page 1-
24.
Controller: EEP Fail
Thresholds
This alarm occurs if there is no valid EEPROM threshold data to load.
All controller threshold values will revert back to their failsafe default
values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: Exciter
Changeover
This event is caused by a fault in the active exciter while the
automatic changeover function is enabled. No further exciter
changeovers can occur until the fault is cleared and the automatic
changeover function is re-armed (using the
Changeovers page; refer
to the Operations and Maintenance Manual). Check for associated
alarm(s) that may have caused the changeover and refer to their
troubleshooting action.
Controller: Exciter
Compatibility Fault
This alarm occurs when there is an incompatible software release in
the exciter. Update the exciter software to clear the fault.
Controller: Fan PS A
(or B) AC Fail
This alarm occurs if fan power supply module A (U7) or B (U8) is
reporting an ac failure, indicating its ac input voltage is less than
175 V ac. Check the ac voltage applied to the suspect fan power
supply module. If the ac voltage is acceptable, replace the fan supply
module (see “Fan, IPA and Module Power Supply Replacement” on
page 1-43).
Controller: Fan PS A
(or B) Fail
This alarm occurs if fan power supply module A (U7) or B (U8) is
reporting a PS failure, indicating its output voltage is outside its
acceptable range. Check the dc voltage output of the suspect fan
power supply module. If the dc voltage is out of tolerance, replace the
fan supply module (see “Fan, IPA and Module Power Supply
Replacement” on page 1-43). If the voltage is acceptable, suspect the
control/interface PWB (A1) or interconnect cabling.
Alarm (with Prefix) Description and Troubleshooting Action
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