Hypertherm does not recommend the use of any of their plasma cutters on a rotary phase converter....either the inverter based air Plasma systems or the Chopper based High Definition HPRXD plasma cutters. The imperfect three phase waveform can cause damage to the power supply.....and also will be hampered by the phase detection circuitry. That being said, there are a few end users that use this equipment with a phase converter. Jim Colt Hypertherm jim.colt@hypertherm.com