480v stepup to grive mill.

I purchased an ACRA mill at auction. Was in service up until the auction at a local shop. I had intended to switch the motor to 230 3ph, but the Yaskawa VFD on the mill is 380-480V input.

My shop is small and i don't foresee needing more than 15-20hp of 3ph power. My current RPC has a 7.5hp idler, and i have several more surplus 3ph motors from 5hp to 25hp. My current thought is to run the RPC at 230V, and put in a step up transformer to get to 460v.

The other option to to replace the VFD on the ACRA with a 3hp 230v input VFD. My thought here is that 380-480 input VFDs are common on surplus equipment, so having 460v 3ph power available in the shop would be a good thing.

My understanding is that the RPC putput is Delta, and i am considering a 15-25 kva transformer to provide the 460v. I find lots of delta-wye 460d-230y transformers, but my thought is that i need a delta-delta, or a true 230d-460y step-up transformer. I don't see where i need the 460v wye configuration in my application, as my machines will run a 380-480 VFD for the motor speed control. The small cnc lathe and mill in my plan will be 230V; so again, no need for the 460y.

Any thoughts or guidance would be greatly appreciated.

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I decided to just go with a 220v vfd for the time being. More cost effective until i get more 3ph equipment.

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