Troubleshooting

There can be many different reasons for a fault, depending on the system setup.

  • The fault causes in the tables are those which directly influence the servo motor.
  • Peculiarities which appear in the control loop behavior can usually be traced back to an error in the parameterization of the servo drive.
  • The documentation for the servo drive and the setup software provides information.
  • For multi-axis systems there may be further hidden reasons for faults.

Brake Does Not Engage

Possible Cause

Correction Measures

Faulty brake.

Replace the servo motor.

Servo motor shaft is axially overloaded.
  • Check the axial load, reduce it.
  • Replace the servo motor, since the bearings have been damaged.

Required holding torque is too high.

Check the dimensioning.

Brake Does Not Engage

Possible Cause

Correction Measures

Faulty brake.

Replace the servo motor.

Servo motor shaft is axially overloaded.
  • Check the axial load, reduce it.
  • Replace the servo motor, since the bearings have been damaged.

Required holding torque is too high.

Check the dimensioning.

Error Message: Feedback

Possible Cause

Correction Measures

Break in hybrid cable, cable crushed, or similar.

Check the cable.

Drive-side feedback connector is not properly plugged in.

Check the connector.

Error Message: Servo Motor Brake

Possible Cause

Correction Measures

Faulty servo motor holding brake.

Replace the servo motor.

Short-circuit in the supply voltage lead to the servo motor holding brake.

Remove the short-circuit.

Error Message: Servo Motor Temperature

Possible Cause

Correction Measures

Loose drive-side feedback connector or break in the hybrid cable.
  • Check the connector.
  • Replace the hybrid cable, if necessary.

Servo motor thermosensor has switched.
  • Wait until the servo motor has cooled down.
  • Investigate why the servo motor becomes too hot.

Error Message: Output Stage Fault

Possible Cause

Correction Measures

Hybrid cable has short-circuit or earth short.

Replace the cable.

Servo motor has short-circuit or earth short.

Replace the servo motor.

Servo Motor does not Rotate

Possible Cause

Correction Measures

Brake is not released.

Check the brake controls.

Break in the setpoint lead.

Check the setpoint lead.

Drive is mechanically blocked.

Check the mechanism.

Servo motor phases in wrong sequence.

Correct the phase sequence.

Servo drive is not enabled.

Supply ENABLE signal.

Servo Motor Oscillates

Possible Cause

Correction Measures

Break in the hybrid cable shielding.

Replace the hybrid cable.

Servo -Servo drive gain too high.

Use the servo motor default values.

Servo Motor Runs Away

Possible Cause

Correction Measures

Servo motor phases are in the wrong sequence.

Correct the phase sequence.