THCAD-10 configuration, QtPlasmaC

phillc54 wrote:

sm2wmv wrote: I guess I should probably try to get a reed relay and fix an ARC OK signal as well, but eager to get it working

Some plasma cutters just don't work with the soft arc ok, the reed is very reliable.

I have several machines using soft arcok by now with no issues at all, so i think the failures are caused by interference and bad grounding/shielding.
Also, on HF/HV pilot arc plasma sources, the spark gap can cause the lost arc, making the gap just a tiny bit smaller fixes that.