F
10. Faults and remedies
Fault Possible causes Remedy
Bearing is too hot Bearing noise*) Motor runs
unevenly
Too much grease in bearing Remove excess grease
Bearing dirty Replace bearing
Belt tension too high Reduce belt tension
Coupling forces are pulling or
pushing
Realign motor, correct coupling
Coolant temperature above 40°C
(104°F)
Adjust temperature of cooling air
Not enough grease in the bearing Grease according to specifications
Motor incorrectly mounted Check mounting type of motor
Bearing grease dark coloured Check bearing currents
Scoring at bearing inner race, e.g.
caused by motor start with locked
bearing
Replace bearing, avoid vibrations
at standstill
Unbalance caused by coupling Exact balancing
Motor fastening unstable Check fastening
*) If remedies described are insufficient, we recommend to replace the bearings.
Fault Possible causes Remedy
Motor does
not start
Motor is too
hot
High
decrease in
speed
Protective
device
triggers
Countertorque too high Check motor– and load torque
Mains voltage too low Check mains conditions
Phase interruption Check mains supply
Wrong winding connection
Observe wiring diagram and rating
plate
Overload Compare data on rating plate
Too many starts per hour Observe rated duty type
Insufficient ventilation
Check ventilation passages, check
direction of rotation
Insufficient cooling
Check cooling water inlet and
outlet temperature
Ventilation passages or water
chambers dirty
Clean
Short–circuit of winding or terminal
board
Measure insulation resistance
Starting time exceeded Check starting conditions
Faults and remedies
26
C - SERIE BESTRIEBE- UND wARTUNGSANLEITUNG
26
C - SERIE BESTRIEBE- UND wARTUNGSANLEITUNG
CHM - SERIES Maintenance and Sparepartlist
Stöwer Antriebstechnik GmbH, Enneststrasse 3, 51702 Bergneustadt, Tel. 02261-40970, Fax: 41309, www.stoewer-getriebe.de
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