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