DRIVE FAULTS
92
ERROR/FAULT CODE PROBABLE CAUSE/ — CORRECTIVE ACTION
901 PCU IST FAULT – Current flow in excess of 300% of rated armature
current detected. Check for:
1. Ground fault or intermittent connection in motor armature circuit.
2. Faulty current measuring module.
3. Poor current regulator tuning.
902 POWER SUPPLY FAULT (CPU Reset Required)
The Low Voltage Power Supply (A4) output has dropped below 60% of
the rated voltage. This fault will shutdown the drive. Possible causes;
Loss of 115VAC power.
Short circuits in +5V, +/-15V, or +24V circuits, possibly external to the
drive.
Failed Power Supply
Blown fuse internal to power supply.
903 LINE SYNCRONIZATION FAULT (CPU Reset Required)
The Phase Locked Loop has lost synchronization with the 3 Phase AC
input power supply. When this occurs, the Severe Fault flag is set and
the current reference is forced to zero. Generally this is caused by AC
input power problems and is self-correcting. This fault will shutdown
the Drive.
This fault will often occur with a F904 fault.
904 LOW LINE VOLTAGE FAULT
The AC input power has dropped below 80% of the Nominal AC Line
Voltage #9 for 3 consecutive cycles or lower than 50% for one cycle.
When this occurs, the Severe Fault flag is set and the DSD 412 current
reference is forced to zero. This fault will shutdown the Drive.
905 FIELD LOSS FAULT This fault will shutdown the Drive.
The field current feedback has dropped below 80% of the expected
current during the following conditions:
#49 when Drive is in Field Weakening Mode (Top speed).
#50 when Drive is in Full Field Mode (Accel or Decel).
#53 when Drive is in Standing Field Mode (not running).
Probable causes are:
Open circuit failure of motor field or motor field wiring.
Hardware failure of motor field control circuitry.
Loss of power or incorrect phasing to Field Rectifier.
906 DCU FAILURE FAULT (DSD 412 Power down is required.)
The update of the Dual Port RAM from the Drive Control Unit (DCU) is
unreliable. This requires the replacement of the Drive Control PCB,
A1. This fault will shutdown the drive.
907 THERMISTOR FAULT The thermistor is found to be open or shorted.
Check and/or replace the thermistor. It should measure between 2K –
10K ohms at 20C room temperature. A Thermistor Fault will also
occur if the machine room ambient temperature is below 0C as the
resistance it detected is too high to be measured. An open thermostat
on larger drives will also indicate F907. This fault will not shutdown the
Drive.
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