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The log files showed that the encoder of the floor stand base rotation motor had a hardware problem and, therefore, no valid position data could be transmitted to the controller.As a result, movements of this system were prevented.To resolve the reported issue, the parts of the floor stand (motor with the encoder, the encoder cable, and the "smc" module) were replaced by local service.Following the final adjustment, the system works as specified.The motor of the base rotation returned for further examination was installed on a test unit.However, during testing no fault could be found on the motor, as the encoder values were readable.Based on the analysis result, it could be concluded that a defective cable was the cause of failure.Siemens is not aware of similar events in the field.
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