TESTS WHEN ISOLATED
1) VISUAL TESTS:
- Check that motor frame is mechanically sound.
- Remove terminal cover plate and check for ingress of foreign material, moisture etc.
- Check for signs of overheating, arcing or burning.
- Check ventilation is clear.
2) ELECTRICAL TESTS:
- Identify windings using a continuity tester.
- Measure the resistance of the windings ( 3 identical readings ).
- Measure the insulation resistance between each winding and between windings and frame.
3) MECHANICAL TESTS:
- Check that the rotor is free to rotate and does so smoothly / quietly.
- Check that motor interior is free of dirt, dust, water and oil.
- Check for play in bearings.
4) TESTS WHEN RUNNING:
- Check run currents ( If uneven check voltage at motor terminals ).
- Check speed of motor at no load and full load.
- Check vibration levels and noise levels.
- Check for temperature hot spots.
