Siemens FLENDER B3 E Series Assembly And Operating Instructions Manual page 85

Faults
Auxiliary drive motor will start,
but the output shaft of the main
gear unit will not rotate.
Main motor can start although
auxiliary drive with
speed­monitoring device is in
operation.
Fault in oil­supply system.
Causes
Wrong direction of rotation of
motor.
Wrong installation and/or defect of
cage with grippers of overrunning
clutch.
Overrunning clutch defective.
Electrical interlocking between
main and auxiliary motor is
defective.
Speed­monitoring device is
defective.
BA 5033 EN 03/2011
85 / 96
Remedy
Change polarity of motor.
Contact Customer Service.
Install cage of overrunning clutch
turned by 180° and/or replace.
Contact Customer Service.
Install a new overrunning clutch.
Check connections; replace
defective units, if necessary.
Check connections; replace
defective units, if necessary.
Consult operating instructions
for oil­supply system.