Unfortunately I don’t run my SuperPID off of the board, I used a switch and a knob so I can’t exactly advise. However my thoughts on an “Emergency Kill” switch is that it should cut power to the mains and SO3 and effectively “Kill” all possible movement… If it’s a true emergency you want it to stop and you’re not so worried about recovery. It took me a while to get my head around this too, but with some suggestions from others I finally realized it’s the right thing to do.
Here’s my build, maybe you can get some ideas:
If yo have more questions just ask!
Dan