Floating switch problem with plasmac

I have this bob
www.hitmint.com/products/1pc-5-axis-mach...troller?currency=EUR

the floating Switch flashes on plasmac, if I connect it to the gnd it remains fixed?

youtube.com/shorts/xU2DiQJsGU4?feature=share
 

Grounding/shielding issue, use shielded cable, ground everything at a single point inside the electronics box.
Trying to use the plasma while not properly grounded/shielded usually ends up badly.
Open up the "show hal configuration" and watch othe input pins, most probably the rest of them will also flash.
There is a very nice PDF by Hypertherm about grounding practices on the net, so do a search for it.

thank you, I haven't connected the plasma yet, just the drivers and stepper motor

First link is to the PDF the second to a video on the same subject by Hypertherm, those are just the ground rules that can not be skipped for plasma.
www.google.com/search?q=hypertherm+groun...wAEB&sclient=gws-wiz

problem solved, I changed the card thank you