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Section 1
General Information
5-2 Troubleshooting MN722
Table 5-1 Converter Control Board Fault Messages
FAULT MESSAGE DESCRIPTION
Current Sens FLT Defective phase current sensor or open circuit detected between control board and current
sensor.
DC Bus High Bus over voltage condition occurred.
DC Bus Low Bus under voltage condition occurred.
GND FLT Low impedance path detected between an output phase and ground.
High INIT CUR Phasing between main power connections, zero crossing detectors, line reactor and
control does not match.
ID:No Feedback Control board installed in power base that does not have current feedback and current
feedback is required.
INT Over-Temp Temperature of control heatsink exceeded safe level.
Invalid Base ID Control does not recognize power base ID.
Logic Supply FLT Logic power supply not working properly.
Lost AB Phase
Missing phase detected by mP.
Lost BC Phase
Missing phase detected by mP.
Lost User Data Battery backed RAM parameters have been lost or corrupted.
When fault cleared (Reset), the control should reset to factory preset values.
Low INIT Bus V Insufficient bus voltage on startup.
Memory Error EEPROM error occurred. Contact Baldor.
mP Reset
Watchdog timer detected error.
New Base ID Control board sensed a different power base since last time it was powered up.
No Faults Fault log is empty.
Overcurrent FLT Instantaneous over current condition detected by bus current sensor.
Overload Output current exceeded allowable rating.
PWR Base FLT Desaturation of power device occurred or bus current threshold exceeded.
Sync To Line Incorrect line phasing or frequency detected on startup.