
Fault Messages
When a fault condition occurs, motor operation stops and a fault is displayed on the operator
keypad. A list of the possible faults and their descriptions follows. Refer to the Troubleshooting
section which follows for recommended corrective actions.
Fault Displayed
Fault Description
CURRENT SENS FLT
Defective phase current sensor or open circuit detected between control board and current
sensor.
DC BUS HIGH
Bus overvoltage condition occurred.
DC BUS LOW
Bus undervoltage condition occurred.
FEEDBACK LOSS
Resolver slipping; noise on resolver lines or resolver power supply loss.
EXTERNAL TRIP
An external overtemperature or open circuit occurred on J1-16.
FOLLOWING ERR
Excessive following error detected between command and feedback signals.
GND FLT
Low impedance path between an output phase and ground detected.
INT OVER-TEMP
Control heatsink exceeded safe operating level.
INVALID BASE ID
Control board does not recognize power base ID.
INVERTER BASE ID
Control board installed on power base w/o current feedback.
LINE REGEN FLT
Applies to Series 21 and 22 Line Regen controls only.
LOGIC SUPPLY FLT
Logic power supply not working properly.
LOST USER DATA
Battery backed RAM parameters have been lost or corrupted. When fault cleared control
will reset factory presets.
LOW INIT. BUS V
Insufficient bus voltage upon startup.
MEMORY ERROR
EPROM error occurred. Contact factory.
NEW BASE ID
Control board changed since last operation.
NO FAULTS
Fault log has no recorded faults.
NO EXB INSTALLED
Programmed operating mode requires expansion board.
OVER-CURRENT FLT
Instantaneous over current condition detected by bus current sensor.
OVERLOAD - 1 MIN
Output current exceeded allowable 1 minute rating.
OVERLOAD - 3 SEC
Output current exceeded allowable 3 second rating.
OVERSPEED
Motor speed exceeded 110% of programmed max RPM.
mP RESET
Power cycled before bus bled completely down.
POWER MODULE
Affects shared bus multiaxis systems only. Indicates power supply not working properly.
PWR BASE FLT
Desaturation of power device occurred or bus current threshold exceeded.
REGEN PWR FLT
Regen power exceeded DB resistor rating.
USER FAULT TEXT
Custom software operating fault occurred.
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DIAGNOSTIC INFO AND TROUBLESHOOTING
MN723H-10/95 11/28/95 1:13 AM Page 90 (Black plate)
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