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Thanks @dc42 and thanks @Danal -- I have done everything on your list, and as the board is not in a metal enclosure, I will ignore the Ethernet shield ground connector for now. I have a genuine Meanwell PSU so I am confident it is isolated.
@pipersw said in How to ground steppers:
@nxt-1 I see the diagram of your psu, and the 0V and earth are not connected. Have you take a measurement of resistance between 0V and earth ?
I misread the diagram, there is capacitor from 0V to mains earth, not a DC path
