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 behavior can usually be traced back to an error in the parameterization of the servo drives.

Information about this can be found in the documentation for the servo drives and the commissioning software.

Error	Possible cause	Measures to remove the cause of the fault
Motor does not move	Servo drive not enabled Break in setpoint lead Motor phases in wrong sequence Brake not released Drive is mechanically blocked	Apply 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 the feedback cable Use the 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	Eliminate short-circuit Increase the voltage Replace the motor brake
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 Read out the error messages
Brake does not grip	Required holding torque too high Brake faulty	Check the design Replace the motor brake

For multi-axis systems there may be further hidden reasons for faults.