ABB MT series Instructions d'installation et d'entretien - Page 8
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Installation and maintenance instruction
Fläkt Woods three phase asyncronous motor
Manufacturer: ABB
TROUBLE
CAUSE
Motor vibrates
Motor misaligned
Weak support
Coupling out of balance
Driven equipment unbalanced
Defective bearings
Bearings not in line
Balancing weights shifted
Contradiction between balancing of rotor
and coupling
(half key – full key)
Polyphase motor running single phase
Excessive end play
Scraping noise
Fan rubbing air shield
Fan striking insulation
Loose on bedplate
Noisy operation
Airgap not uniform
Rotor unbalance
Hot bearings general
Bent or sprung shaft
Excessive belt pull
Pulleys too far away
Pulley diameter too small
Misalignment
Hot bearings ball
Insufficient grease
Deterioration of grease or lubricant
contaminated
Excess lubricant
Overloaded bearing
Broken ball or rough races
Fläkt Woods
8265 GB 2011.10
WHAT TO DO
Realign.
Strengthen base.
Balance coupling.
Rebalance driven equipment.
Replace bearings.
Line up properly.
Rebalance motor.
Rebalance coupling or motor
Check for open circuit.
Adjust bearing or add shim.
Remove interference.
Clear fan.
Tighten holding bolts.
Check and correct bracket fits or bearing.
Rebalance.
Straighten or replace shaft.
Decrease belt tension.
Move pulley closer to motor bearing.
Use larger pulleys.
Correct by realignment of drive.
Maintain proper quality of grease in bearing.
Remove old grease, wash bearings thoroughly
in kerosene and replace with new grease.
Reduce quantity of grease, bearing should not be more than 1/2 filled.
Check alignment, side and end thrust.
Replace bearing, first clean housing thoroughly.
8
Specifications are subject to alteration without notice