Operation & Maintenance Manual
Alternator Installation and Maintenance
90
22637300
Mechanical Defects
Mechanical defects
Bearing Defect
Action
Excessive overheating of one or both
bearings (temp of bearings over 80°C)
(With or without abnormal bearing noise)
If the bearing has turned blue or if the grease has
turned black, change the bearing.
Bearing race badly locked (moving in its housing)
Overheating
Action
Excessive overheating of alternator frame
(temperature rise of more than 40°C
above ambient)
Air flow (inlet-outlet) partially clogged or hot air is
being recycled either from alternator or prime
mover.
Alternator is functioning at too high a voltage
(over 105% of rated voltage on load).
Alternator overloaded
Vibration Problem
Action
Too much vibration
Misalignment (coupling)
Defective mounting or play in coupling
Incorrect balancing of shaft (Engine-Alternator)
Excessive vibration and humming noise
coming from the alternator
Three phase alternator is single phase loaded in
excess of acceptable level.
Short circuit in the alternator stator
Abnormal Noises
Action
Alternator damaged by a significant
impact which is followed by humming and
vibration
System short circuit
MIS paralleling
Possible consequences (according to the
seriousness of the above faults):
Broken or damaged coupling
Broken or bent shaft end
Shifting and short circuit of main field rotor
Fractured fan or coming loose on shaft
Blown rotating diodes, or and A.V.R
Содержание G10WMI-2D-T2
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