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Section 1
General Information
5-10 Troubleshooting MN722
Table 5-4 Inverter Section Troubleshooting Continued
INDICATION POSSIBLE CAUSE CORRECTIVE ACTION
External Trip Motor ventilation insufficient. Clean motor air intake and exhaust.
Check external blower for operation.
Verify motor’s internal fan is coupled securely.
Verify correct line power to external blower.
Motor draws excessive current. Check motor for overloading.
Verify proper sizing of control and motor.
No thermostat connected. Connect thermostat.
Verify connection of all external trip circuits used with thermostat.
Disable thermostat input at J1-16 (External Trip Input).
Poor thermostat connections. Check thermostat connections.
External trip parameter incorrect. Verify connection of external trip circuit at J1-16.
Set external trip
parameter to “OFF” if no connection made
at J1-16.
Following ERR Speed proportional gain set too low. Following error tolerance band set too narrow.
Increase Speed PROP Gain parameter value.
Current limit set too low. Increase Current Limit parameter value.
ACCEL/DECEL time too short. Increase ACCEL/DECEL parameter time
Excessive load. Verify proper sizing of control and motor.
GND FLT Improper wiring.
Wiring shorted in conduit.
Motor winding shorted.
Disconnect wiring between control and motor. Retry test.
If GND FLT is cleared, reconnect motor leads and retry the test.
Rewire as necessary.
Repair motor.
If GND FLT remains, contact Baldor.
INT Over-Temp Motor Overloaded. Correct motor loading.
Verify proper sizing of control and motor.
Ambient temperature too high. Check that air flow path is clean and free of debris.
Relocate control to cooler operating area.
Add cooling fans or air conditioner to control cabinet.
Invalid Base ID Control does not recognize HP and
Voltage configuration.
Press “RESET” key on keypad. If fault remains, access diagnostic info
and compare power output section Power Base ID # with Table 5-5. If
different, contact Baldor.
Inverter Base ID Power base with no output phase
current sensors being used.
Replace power base with one that has output leg current
feedback. Contact Baldor.
Logic Supply FLT Power supply malfunctioned. Replace logic power supply.
Lost User Data Battery backed memory failure. Parameter data was erased. Disconnect power to control and
apply power (cycle power). Enter all parameters.
Cycle power. If problem persists, contact Baldor.
Low INIT Bus V Improper AC line voltage. Check input AC voltage level.
Memory Error EEPROM memory fault occurred. Press “RESET” key on keypad. If fault remains, call Baldor.
mP Reset
Power was cycled before Bus
voltage reached 0VDC.
Press “RESET” key on keypad.
Disconnect power and allow at least 5 minutes for
Bus capacitors to discharge before applying power.
If fault remains, call Baldor.
Continued on next page.