SKF 655-41261-1, Operating Instructions Manual

Page: 71 / 94

11
EN
11. Troubleshooting
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951-181-014-EN
Version 16
11.3 Fault table of SEW motor
Fault Possible cause Remedy
Motor does not start
Feed line interrupted Check and correct connections, if necessary.
Blown fuse Replace fuse
Motor circuit breaker has responded
Check correct adjustment of motor circuit breaker. If
necessary, remedy the fault
Motor circuit breaker does not switch; fault in the control
program.
Check control program of motor circuit breaker and, if
necessary, remedy the fault
Motor is hard to start
Motor has been designed for delta connection, but has
been wired to star connection
Correct the wiring
Voltage or frequency largely differ from the target value
at least when starting the motor
Provide better grid conditions; check cross section of the
feed line
Motor does not start in the star connec-
tion, but in the delta connection only
In case of star connection torque is not sufficient
Provided the delta starting current is not too high, im-
mediately switch the motor on. Otherwise use larger
motor or special version (after consultation)
Contact fault on star respectively delta connection Remedy the fault
Wrong direction of motor rotation Motor connected wrongly Reverse two phases
Motor hums and has a high power
consumption
Defective winding
Consult the manufacturer. Motor must be sent to the
workshop for repair
Rotor touches
Fuse is tripped or motor circuit breaker
trips immediately
Short circuit in the line Remedy the short circuit
Short circuit in the motor
Consult the manufacturer. Motor must be sent to the
workshop for repair
Lines connected wrongly Correct the wiring
Short circuit on the motor
Consult the manufacturer. Motor must be sent to the
workshop for repair