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