I bought a an older Acra cnc mill that requires 360-480 Volts to run. I have a 20hp rotary phase converter and I just picked up a 30kva 3 phase transformer that is Hv 480 lv 208. My question and I am really surprised I could not find an answer for it is. Do I wire it feeding the idler motor that is 220/440 or after as it is leaving the rotary phase converter. Also I have seen the pro and cons of wiring the transformer delta/ whey is there any preferred method in this situation? I would really appreciate any help I am going crazy not having a mill working.