Product Manual

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Problem Likely Causes What To Do Motor has been running, Fuse or circuit breaker is tripped Replace the fuse or reset the breaker then fails to start. Armature is shorted or went to ground. Disassemble motor and inspect the armature for a burnt coil. Inspect the Motor may make a humming noise and commutator for burnt bars. If this condition exists, the motor needs to be replaced. the circuit breaker or fuse will trip. To test, set your OHM to the RX1 scale, touch probes to bars 180 degrees apart all around the commutator. The reading should be equal. The brushes may be worn down too far and no Inspect the brushes to make sure that they are still making contact with the longer make contact with the commutator. commutator. Refer to manufacturer’s recommended brush length chart. Controller may be defective. Verify voltage is coming out of the controller. Motor runs but loses power. Load has increased. Verify the load has not changed. Measure the amp draw of motor against the full load amp rating of the motor. If the amp draw is higher than rating, motor is undersized for application. Motor controller not properly set. Check controller manual for adjustments. The torque and/or IR compensation settings may need adjustment. Motor may have an open connection. Inspect the armature for an open connection. Brushes may not be seated properly or Verify that the brushes are properly seated and measure their length against the worn beyond their useful length. recommended brush length chart. Motor takes too long to accelerate. Motor controller not properly set. The accel trim pot of the controller should be adjusted. Brushes are worn. Verify brush length. Bearings may be defective. Inspect bearings for proper service. Noisy or rough bearings should be replaced.
DC Motor Trouble-Shooting Chart (cont’d)