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4.5 Diagnostics of defects
4.5.1 Mechanical causes
Breakdown
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Product documentation 1D 3.8.en
Possible cause
Contact of rotor or shaft with
solid parts of machine appears
Limited access of air, excessive
amount of dust in winding,
dust in cooler ducts
Polluted or blocked air filter (if
it is equipped)
Cooler function gets worse
(goes for design with water
cooler)
Unbalance on rotor
Unbalance in coupling
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Transfer of vibration from
linked machine
Badly fixed generator in
foundation or changes in
foundation
Resonance with foundation
Lack of lubricant in bearing
Bearing is overloaded
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Damaged or badly worn out
bearing
Tab. 9 Mechanical causes
Rev. E, 10/13
Remedy precaution
Find and eliminate cause
Perform check of access of air,
pollution of winding, check cooler
Filter exchange, if need to clean
Clean cooler with regards to
operational instructions, check
amount of cooling medium, vent
cooler
Contact producer and require
balancing
Rebalancing
Check of linked machine
Level machine, check foundation,
and tightening of generator
Strengthen foundation
Check amount of lubricant in bearing
Check tightening, levelling and
clamping of machine
Perform exchange
page 33/42
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