[CATCH22]

I have a 1981 Excello cnc mill that I am going to power up soon,my question is that it has a 3 phase autotransformer that has been added to it,and the transformer is a 9kva 60hz HV/HT 230 LV/BT 208 is this transformer for 208 volts in and transforms it to 230 volts out because my power is already 240 volts so Im wondering if I can just skip using the transformer and wire it direct to the main disconect?

Thanks Mike

[Al_The_Man]

The 3ph auto transformer is not going to be much good to you on 1 phase, or are you on 3ph now, you could use it if you are on 240v 1 ph but you may as well go direct.
However, how do you intend to power the 3 phase spindle, unless it already has a drive or VFD?
Al.

[CATCH22]

Hi Al,

I have a 10hp RPC that I will run it on. So I can just remove the transformer then and wire it direct?

Thanks mike

[Al_The_Man]

You should be able to run it off the RPC, is this a 602 or larger?
Al.

[CATCH22]

It is a 604 and it says it uses 6 kva.