I have a PowCon 300SS. It can be run on either three phase, or single phase (220). I have the manual that explains the procedure for changing the input current.
I have only run it on 460v Three Phase.
If the 300SS manual will help, reply with a fax number here and I'll send you the pages you will need. There are some internal "voltage change-over procedures" to follow.
FYI: The manual does recommend a 60amp fuse for 230v single phase, and a 30amp fuse for 460 three phase.