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Section 1
General Information
Troubleshooting 5-13MN722
Table 5-4 Inverter Section Troubleshooting Continued
INDICATION POSSIBLE CAUSE CORRECTIVE ACTION
Power Module Power supply failure. Press “RESET” key on keypad. If fault remains, call Baldor.
PWR Base FLT Improper ground
Excessive current usage.
Be sure control has separate ground wire to earth ground.
Panel grounding or conduit connections is not sufficient.
Disconnect motor leads from control and retry test. If fault remains, call
Baldor.
Encoder coupling slipping, broken
or misaligned.
Correct or replace encoder to motor coupling.
Encoder bearing failure. Replace encoder.
Excessive noise on encoder lines. Check encoder connections.
Separate encoder leads from power wiring.
Use Baldor encoder cable.
Cross encoder wires and power leads at 90°.
Electrically isolate encoder from motor.
Install optional Isolated Encoder Feedback expansion board.
Electrical noise from external DC
coils.
Install reverse biased diodes across all external DC relay coils as shown in
the Opto Output circuit examples of this manual. See Electrical Noise
Considerations in Section 5 of this manual.
Electrical noise from external AC
coils.
Install RC snubbers on all external AC coils. See Electrical Noise
Considerations in Section 5 of this manual.
Excessive load. Correct motor load.
Verify proper sizing of control and motor.
Excessive power in dynamic brake
circuit.
Verify proper Ohm and Watt parameters of Brake Adjust block.
Increase decel time.
Regen PWR FLT Excessive input voltage. Verify proper AC Line voltage.
Use step down transformer if needed.
Use line reactor to minimize spikes.
Resolver Loss Resolver defect. Check resolver to motor coupling (align or replace if needed).
Verify correct wiring. Refer to the Resolver to Digital
expansion board manual.
Electrically isolate resolver from motor.
Use Baldor Resolver cable.
Torque Prove FLT Unbalanced current in 3 motor
phases.
Check continuity from control to motor windings and verify motor
connections.
Unknown Fault Fault occurred but cleared before its
source could be identified.
Check AC line for high frequency noise.
Check input switch connections and switching noise.
User Fault Text Fault detected by custom software. Refer to custom software fault list.