ABB AMXE250 - Trouble Shooting

MOTORS FOR HEAVY ELECTRICAL VEHICLES
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8. Trouble shooting
Instructions to determine the cause of abnormal behavior or failure conditions and proposed corrective
measures.
Should abnormal behavior arise when starting or operating the motor, the cause should be determined
and eliminated immediately, whereby prompt action can often avoid serious damage. In case of
phenomena which cannot be satisfactorily explained, please contact your local ABB sales office for
further clarification.
Use the guidelines below for trouble shooting.
Mechanical failures
Failure Possible cause of failure Corrective action
Motor is vibrating and generating
abnormal noise.
Damage bearing. Please contact ABB for further instructions.
Motor starts with scraping noise. Foreign particles in the air gap. Please contact ABB for further instructions.
Motor starts with abnormal
permanent scraping noise.
Rotor and stator touch each other in
the air gap.
Please contact ABB for further instructions.
Motor is abnormally hot also at no
load.
Liquid cooling system is out of
order.
Check liquid cooling system’s functionality.
High vibrations at run out. Too high residual unbalance. Please contact ABB for further instructions.
Bearing failure during normal
operation.
Misaligned total driving axle system. Check the alignment, make corrections, and
contact ABB for further instructions.
Motor does not start at load,
normal magnetic noise.
Load torque too high. Uncouple the motor and test it separately at no
load, compare the results with other motors
tested at no load.
Shaft torque disappear. Coupling or shaft failure. Take the motor out of them chassis. Investigate
the shaft and coupling. Replace defect component.
Table 7. Mechanical failures.