Hi All,
But of a strange one here. I've been getting false triggers from my proximity sensors. But only when their shielding is grounded to earth. Removing the earth solves the problem immediately. Weird

Specs:
48V Toroidal PSU for stepper drivers. . Earthed. Positive and common/negative floating.
24V PSU. Earthed
5V PSU. Earthed
All cables are shielded and all shields are earthed at one point, along with every other earth.

24V and 5V power supplies share a common/negative.
48V toroidal PSU does not share anything.
The problem happens whether I turn off the 48v supply or not.
Anything glaringly obvious I might have missed?

Thanks
Neal