LOW VOLTAGE MOTORS - Installation, operation, maintenance and safety manual - rev. 01 - 1.07.2016
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TROUBLE CAUSE SOLUTION
Motor
vibrates
Motor misaligned Realign
Weak support Strengthen base
Coupling out of balance Balance coupling
Driven equipment unbalanced Balance driven equipment
Defective bearings Replace bearings
Bearings not in line Repair motor
Balancing weights shifted Rebalance motor
Contradiction between balancing
of rotor and coupling
(half key-full key)
Rebalance coupling or motor
Polyphase motor running single
phase
Check for open circuit
Excessive end play Adjust bearing or add shim.
Scraping noise
Fan rubbing end shield of fan
cover
Correct fan mounting,
Loose on bedplate Tighten holding bolts
Noisy operation
Air gap not uniform Check and correct end shield ts or bearing ts
Rotor unbalanced Rebalance rotor
Hot bearings
Bent or sprung shaft Straighten or replace shaft
Excessive belt pull Decrease belt tension
Pulleys too far away from shaft
shoulder
Move pulley closer to motor bearing
Pulley diameter too small Use larger pulleys
Misalignment Correct by realighment of the drive
Insufcient grease Maintain proper quality and amount of grease in bearing
Deterioration of grease or
lubricant contaminated
Remove old grease, wash bearings and replace the grease with new grease
Excess lubricant Reduce quantity of grease, bearing should not be more than half full
Overload bearing Check alignment, side and end thrust
Broken ball or rough races Replace bearing, clean housing thoroughly rst
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