The breakout board we have has two relays. Looks like the relay we use has died. It will flick on but not flick off unless you unplug the power to the whole cnc controller box.
So I went and moved the two wire to the second relay and reassigned the pins to suit.
Now the plasma torch is firing again and turning off. On the old relay it would fire and stay on.
I notice that when the plasma is is the relay will rattle fast as in on/off 10 times really fast until the plasma arc is established. Maybe this was also occurring when on the first really and it just simple wore out.
So what can I do to stop this flicking of the relay? Is there a debounce setting for an output like this relay? Or is it just electrical noise from the plasma?