I have experience with a Thermadyne plasma welding system that consisted of all Thermadyne components, the WC100B consol, water cooler, sequencer, and a 300 amp DC inverter power supply. As you may already know, the WC100B consol serves the following functions in a plasma welding system. It provides a low current (10A) for the pilot arc between the tungsten electrode (-) and the copper plasma orifice tip (+), it also has flow meters to set the plasma and shield gas flow, it also has gas and water flow solenoids, and a gas pressure sensor (maybe a water pressure sensor also?). I recall that sometimes our system would not operate because the gas pressure was too low or the sensor was not functioning. By the way, the sensor can be adjusted and electrically tested. Now to answer your question, I suspect that virtually any DC power supply could be used.