Need 400V 3phase for CNC machine, best approach?
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    Default Need 400V 3phase for CNC machine, best approach?

    Just got a DMG Mori machine delivered and it calls for supply power of 400V x3, N, PE (protected earth) 50/60Hz.

    ​​​​​​​My shop has 208/120 3phase power and I was planning to buy a local 480V to 208V delta Wye transformer and simply backfeed it as well as adjusting the taps to get below 440V.

    Wiring diagrams for the machine say this:
    "Isolating transformer necessary if:
    --- voltage <360V
    --- voltage >440V
    --- TT main
    --- IT main "


    With losses from backfeeding the transformer, I should be close to 400V on tap7 according to the diagram: https://i.ebayimg.com/images/g/HGMAA...nC/s-l1600.jpg


    But with the machine requiring a Neutral, is it possible to wire the high voltage side of the transformer in WYE configuration also ?


    I read several threads on here before making this post, I just need advice on this specific application.

    Any help is much appreciated!

    -Sean


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