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Servo Drives

My drive gives a feedback fault during the autotune. Error #12 (Encoder or resolver rotation sense is wrong). What can I do?

#12 - Encoder or resolver rotation sense is wrong
During the Measure the voltage constant and Measure the motor inertia tests, a torque is applied to the motor. This error will occur if the resulting motion is in the opposite direction to the torque (a positive torque should cause positive velocity).

The most common cause of this error is an incorrectly wired or set up feedback device (encoder or resolver), or an incorrectly wired motor. Select the Test the feedback option. This will indicate if there is a problem with the wiring or setup of the drive and will automatically compensate for certain wiring errors. Note that the Test the feedback test should ideally be run with the motor disconnected from the load.

This error can also occur when autotuning a motor connected to some types of load. In particular, loads with a lot of compliance (e.g. belt drives) or torque offsets (e.g. gravitational loading) can cause problems for autotuning. Another cause of the error may be because the position feedback is noisy, perhaps due to long cables on resolver feedback systems, for example. In either of these cases, it may be necessary to manually tune the system using Fine-tuning mode.

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