What has gone wrong????

[Davek0974]

I can arrange that pretty easily, the plasma is running off one leg of a TP&N isolator, I can easily run the controls from the same point, same phase of course.

is the work lead of a plasma connected to supply CPC?

if not then there is no connection between systems so it should have been ok?

edit

just checked and and the ground return clamp is not connected to supply CPC.