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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
H
igh bearing tem
p
erature
Oi
l l
eaks
Oi
l i
n
si
de the m
achi
ne
B
earing noise or vibration
Visibly poor oil qualit
y
z
z
z
Oil flow malfunction
Check oil pump, oil reduction valve and oil filter
z
Oil viscosity too high
Check oil temperature and oil type
z
z
z
z
Unsuitable 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
z
z
z
z
Excessive axial load
Faulty coupling or mounting
Check coupling, mounting and alignment
z
z
z
Machine misalignment
Realign machine
z
z
Incorrectly 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
z
z
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
z
z
Foreign matter inside the bearing
Clean bearing and check seal condition
Damaged bearing shells
Experienced
malfunction
Corrective action
Possible cause
Insufficient lubrication