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