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Appendix
B 6.1 Fault table
The following chart lists general faults due to mechanical factors.
Bearing faults are dealt with in the relevant supplementary instruc-
tions for bearing.
MECHANICAL FAULTS:
–
–
–
–
POSSIBLE CAUSE
–
–
–
–
–
–
–
–
–
–
–
ELECTRICAL FAULTS:
–
–
–
–
–
–
–
–
POSSIBLE CAUSES
–
–
–
–
–
–
–
–
In addition to rectifying the cause of the fault (in accordance with
1)
measures listed under remedies), it may also be necessary to
remedy the faults that have occurred on the machine itself (e.g.
skimming the commutator, etc.)
Check for pour alignment when hot.
2)
NMA 2748 DE
Seite/Page B22
rubbing noise
exessive temperature
radial oscillation
axiale oscillation
revolving parts rubbing ......................................... Ascertain cause, re-align
air supply obstructed, filter dirty, ..........................
wrong direction of rotation
insufficient cooler capacity ...................................
rotor unbalanced ................................................... Uncouple rotor and rebalance
rotor out of true, shaft distored ............................
pour alignment ...................................................... Re-align machine set, check coupling
unbalace in coupled machine ..............................
Impulses from coupled machine ..........................
interference from gearing ...................................... Check gearing
Resonance with foundation .................................. Stiffen foundation after consulting factory
changes in foundation .......................................... Asertain causes of changes and eliminate.
Motor fails to start
Motor accelerates reluctantly
humming noise during start-up
humming noise during operation
humming noise in rhythm of double slip frequency
excessiv temperature during no-load running
excessiv temperature when running under load
individual winding sections overheat
overload ................................................................. Reduce loading
one supply phase open-ciruited ...........................
one supply phase open-ciruited after ................... Check switchgear and supply circuit
switching on
low system voltage, high frequency .....................
high system voltage, low frequency .....................
stator winding incorrectly connected ...................
inter-turn or phase short circuit in stator winding .. Measure winding resistance and insulation resistance;
Poor soldered connection on cage winding ........
REMEDIES
1)
Check air ducts, clean filter, change fan
Clean cooler and air ducts. Vent air/water cooler.
Check water supply
Discuss with factory
Rebalance coupled machine
Examine coupled machine
Re-align machine
REMEDIES
1)
Check switchgear and supply circuit
Correct system conditions
Correct system conditions
Check winding connections
repair after consulting factory
Repair after manufactorer
2)
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