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Symptom
Abnormal noise or
abnormal vibration
Vibration
Improper direction
Poor or intermittent
overall performance
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EQP Global IEC Series Low-Voltage 50/60 Hz Metric Motor
Troubleshooting Assistance
Probable Cause
Foreign matter between fan and
another object.
Single-phase operation.
Unbalanced electrical power.
Air gap is unequal.
Loose coupling between motor
and the driven equipment.
Loose motor and/or driven equip-
ment.
Improper alignment between
motor and driven machine.
Loose or incorrect base attach-
ment.
Worn bearings.
Unbalanced load.
Warped base.
Improper wiring.
Improper grounding.
Loose connection.
Ordering, Spare Parts, & Service
Remedy
• Check fan path for obstruction.
• Remove foreign object — Keep
surroundings free of foreign objects.
• Check for unbalanced voltage.
• Align the rotor to the center of the stator.
• Check and/or replace bearings.
• Tighten mounting bolts securely.
• Measure vibration amount with vibration
sensor at sides of frame and bearings at
shaft height. Determine if the source is in
the motor or in the driven machine.
• Measure around concentric periphery of
coupling with both clamps and dial gage,
or with feeler gage and straight edge.
Realign if required. Check vertical with a
bubble scale or plumb bob.
• Check coupling and make adjustments
as required.
• Remove the load and run the motor to
determine if the load is unbalanced.
• Worn drive gears of the driven machine.
• Reverse any two of the three-phase input
power leads connected to the motor and
observe the direction of rotation. Refer to
connection plate, connection drawing, or
the certified motor outline.
• Install/secure the ground strap.
• Secure connections.
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