MotFeedbackFault
Applies to: Servo Drive axes.
MotFeedbackFault is a Boolean attribute. It is set for a particular feedback source if one of the following events occur:
- The differential electrical signals for one or more of the feedback channels (e.g., A+ and A-, B+ and B-, or Z+ and Z- for an encoder) are at the same level (both high or both low).Tip:Under normal operation, the differential signals are always at opposite levels. The most common cause of this situation is a broken wire between the feedback transducer and the servo module or drive.
- Feedback "power" or feedback "common" electrical connection has been lost between the drive and the feedback device.
MotFeedbackFault is a recoverable condition.
To clear a MotFeedbackFault:
- Fix the motor feedback connection or device.
- Be sure your program or fault handling routine contains either an MAFR (Motion Axis Fault Reset) or MASR (Motion Axis Shutdown Reset) instruction.
The occurrence of a MotFeedbackFault on a Servo Drive axis sets bit #4 of the DriveFault attribute, the PhysicalAxisFault attribute and bit #0 of the AxisFault attribute.
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