ABB AMA Series Manual page 109

Manual for Induction Motors and Generators
***Following chart for bearing type: Sleeve bearing with flood lubrication
Experienced
malfunction
94 - Trouble Shooting
Trouble shooting
Lubrication system and sleeve bearings
Possible cause
Oil flow malfunction
Insufficient lubrication
Oil viscosity too high
Unsuitable oil quality
Oil inlet temperature too high
Incorrect oil change period
Oil quality is reduced
Faulty coupling or mounting
Excessive axial load
Machine misalignment
Incorrectly assembled bearing
Oil impurities
Bearing currents
Complete bearing failure
Damaged bearing shells
Normal wearing
Operating speed too low
Faulty temperature detector
Faulty instrumentation
Damaged or worn-out bearing seals
Faulty regulator settings
Oil flow too high
Faulty oil piping
Problem in oil return flow
Rotating equipment nearby
External vacuum
Pressure compensation failure
Internal over pressure
Damaged machine seal
Faulty assembled or maintained lubrication piping
Foreign matter inside the bearing
NOTE: For oil leakage of sleeve bearings, see Chapter 8.2 Oil leakage of sleeve bearings.
flood lubrication
Check oil pump, oil reduction valve and oil filter
Check oil temperature and oil type
Check ABB oil recommendations
Check lubrication system and adjust oil temperature
Clean bearing and change oil
Check coupling, mounting and alignment
Realign machine
Verify correct bearing assemblage and adjustments
Change oil, check bearing condition, replace bearing shells
Restore bearing insulation, replace bearing shells
Replace bearing parts
Replace bearing shells
Check the operating speed range of bearing
Check bearing temperature measurement system
Replace bearing seals
Check and correct oil flow
Check oil return pipe inclination
Check pressure levels, relocate rotating equipment
Remove cause for internal over pressure
Replace or repair machine seal
Check pipeline connections and oil filter tightness
Clean bearing and check seal condition
Corrective action
3BFP 000 050 R0101 REV E