Cause : Checksum or CRC error comes when the Encoder 5 trip indicates that there is a checksum or CRC error, or the SSI encoder is not ready. The Encoder 5 trip can also indicate a wire break to a communications based encoder.

1. Check the encoder cable shield connections.
2. Ensure the cable is one uninterrupted cable - remove any connector blocks or if unavoidable minimise the length of any shield pigtails to the connector block.
3. Check the encoder signal for noise with an oscilloscope.
4. Check the comms resolution setting (Pr 03.035).
5. If using a Hiperface, EnDat encoder carry out an encoder auto-configuration (Pr 03.041 = Enabled).
6. Replace the encoder.