Hi All,

Thanks for a great forum and to all the knowledgeable regular posters, much appreciated. I am wanting to use a toroidal transformer direct to AC drives for my CNC build which is an Avid clone 4'x4'. Before purchasing I wanted to request a second opinion on the sizing of the toroidal transformer.

I have purchased four of the Lichuan 5.5Nm 5.8A motors and AC drives (LCDA86H+LC60H2127). I intend to go with a 30+30v secondary's wired in series for 60V output direct to the drives.

According to the calcs on the forum the VA should be 4 x 5.8A x 60%. This gives me 13.92 or 14A then multiplied by 60V giving me 840VA. This would mean getting a 1000VA transformer. Would this not be overkill? Could I rather run them at 54% of rated current which would mean a 750VA transformer? I also noticed in a previous thread from a few days ago that even a 625VA would be sufficient?