Comissioning
Synchronous servomotor
29
Version: 2.1
9.3
Troubleshooting
The following table is to be seen as a “First Aid” box. There can be a large number of different reasons for a
fault, depending on the particular conditions in your system. The fault causes described below are mostly
those which directly influence the motor. Peculiarities which show up in the control behaviour can usually be
traced back to an error in the parameterisation of the servo terminal. Please refer to the documentation for
the servo terminal and the commissioning software.
For multi-axis systems there may be further hidden reasons for faults.
Our applications department can give you further help with your problems.
Error
Possible cause
Measures to remove the cause
of the fault
Motor doesn’t rotate
Servo terminal not enabled
Break in setpoint lead
Motor phases in wrong sequence
Brake not released
Drive is mechanically blocked
Supply ENABLE signal
Check setpoint lead
Correct the phase sequence
Check brake control
Check mechanism
Motor runs away
Motor phases in wrong sequence
Correct the phase sequence
Motor oscillates
Break in the shielding of the
feedback cable
Amplification to high
Replace feedback cable
Use motor default values
Error message: brake
Short-circuit in the supply voltage
lead to the motor holding brake
Voltage too low
Faulty motor holding brake
Remove the short circuit
Increase the voltage
Replace motor
Error message: output stage fault
Motor cable has short circuit or
earth leakage
Motor has short circuit or earth
leakage
Replace motor cable
Replace motor
Error message: feedback
Connector is not properly plugged
in
Break in cable, cable crushed or
similar
Internal error
Check the plug connector
Check cables
Reading of error messages from
OCT feedback
Brake does not grip
Required holding torque too high
Brake faulty
Check the design
Replace motor
