Troubleshoot AC Motors – Part 1

Troubleshoot AC Motors – Part 1

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This is a 4 part series, click to view each part: 1 : 2 : 3 :

Problem A – Motor won’t start or motor accelerates too slowly

A1: Check input power to starter. Is there power on all lines? (Three-phase motors won’t start on one-phase.)Restore power on all lines
  
A2: Check starter. Is overload protection   device opened?Replace or reset device. Does it open again when starting?
A3: Is there power on all lines to motor?Repair starter
  
A4: Is voltage to motor more than 10% below nameplate voltage?Restore proper voltage.
  
A5: Check motor terminal connections. Are any loose or broken?Repair connections.
  
A6: May be wrong motor for application. Is starting load too high?Install Design C or Design D motor. Install larger motor.
  
A7: Is driven machine jammed or overloaded?Remove jam or overload.
  
A8: Are misalignments, bad bearings or damaged components causing excessive friction in driven machine or power transmission system?Repair or replace component.
  
A9: Are bad bearings, bent shaft, damaged end bells, rubbing fan or rotor or other problem causing excessive friction in the motor?Repair or replace motor.
  
A10: Check stator. Are any coils open, shored or grounded?Repair coil or replace motor.
  
A11: Check commutator. Are any bars or rings broken?Replace rotor.

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