ABB AMXE132 Manual page 29

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Electrical Failures
Failure
Motor does not start, no current,
no noise.
Motor starts with a continuous
hum.
Motor starts with the wrong
direction of rotation.
Motor generates an abnormally
high noise level.
Motor current is abnormally high.
Motor has different phase
currents and gets high
temperatures.
Motor gets an abnormally high
phase current and high
temperature, also at no load.
Smoke appears from the motor.
Motor current is abnormally high.
Insulation resistance below 10 MΩ. The stator winding is too damp.
Possible cause of failure
Interruption on at least two phases
(Open circuit).
Interruption on one phase (Open
circuit).
Wrong phase sequence on the
incoming cables.
Can be caused by mechanical or
electrical interference.
Fault in the stator winding.
Asymmetrical feeding.
Wrong incoming voltage level.
Fire after flash-over or short circuit
in a part of the stator winding.
Demagnetized rotor magnets.
Corrective action
Measure the resistance between the phases to
investigate if the stator is damaged. If the stator is
damaged, please contact ABB for further
instructions.
Check the incoming cables. Measure the resistance
for each phase. If the stator is damaged, please
contact ABB for further instructions.
Check the phase sequence for the incoming cables.
Switch off the electrical feed. If the noise remains,
it is a mechanical fault. If not, it is an electrical
fault.
Measure the winding resistance between the
stator terminals.
Check the similarity of the phase voltage on the
incoming cables.
Correct the incoming voltage levels.
Disconnect the motor, remove it. Rewinding is
most likely necessary, please contact ABB for
further instructions.
It's possible to continue the operation with
reduced performance. The rotor should be
replaced to obtain full performance, please contact
ABB for further instructions.
Check for any defect components (covers, seal
etc.). The stator winding must be oven dried,
please contact ABB for further instructions.
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