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