Omron H8PS Operation Manual page 124

APPENDICES
Symptom
The E22 error was output
even after I checked the set-
ting on the DIP switch and
cycled the power supply.
An error message (E∗∗)
appears.
A-10
Probable cause
There is noise on a signal
line.
There is noise on the power
supply line to the H8PS or
encoder.
The Encoder is faulty.

Corrective action
Attach ferrite cores to the signal lines.
Change the path of the signal lines.
Separate the cables from power lines.
Attach a ferrite core to power supply line on the AC
input or DC output side.
Disconnect the FG line.
Ground the FG to a different location.
Change the path of the power supply line.
Separate the cables from power lines.
Replace the Encoder.
Refer to "Appendix B Troubleshooting"