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Thread: 3 Phase 220 to 3 Phase 440

  1. #1
    Join Date
    Feb 2017
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    Titusville, FL
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    3 Phase 220 to 3 Phase 440

    I currently have a Phase Perfect 20HP unit to drive all of my 3ph ~ 220v tools. As a 1 man shop, I only run 1 tool + dust collecto.

    I am looking at acquiring a Martin Shaper that only offers 3ph ~ 440v on their 7.5HP motor... (I can downgrade to their 5.5hp motor, but would rather have the 7.5)

    Is there a way to convert from 3ph ~ 220v to 3ph ~ 440v?

    Thanks.

  2. #2
    Join Date
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    Central WI
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    Three phase transformer or two ( or three ) single phase step up transformers. Delta to wye isolation is first choice, delta to delta autotransformer is second choice. Dave

  3. #3
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    IC, so something like a Grainger (Acme Electric) 4WUE6 - 240VAC Delta to 480VAC Wye would work? That transformer is about 2300.00... Just want to make sure before I decide on the shaper, how much more it would cost to have the power issue solved.

  4. #4
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    Toronto Ontario
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    Anthony, what is the rated full load current of the motor?

    The transformer you selected is 15KVA, depending upon the motor nameplate rating I might select a 9KVA transformer.........Rod.

  5. #5
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    According to Martin the T12 shaper has a 7.5KVA (10HP) option. I'll look at other manuf to see if I can locate a 9KVA unit, might save some on the price.

  6. #6
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    Also, searching used equipment dealers often turns up transformers for a lot less money. I have a 208 to 440 that feeds a sub panel so that multiple machines can be wired up.
    JR

  7. #7
    Unless I am desperate, I will never buy a new transformer.

  8. #8
    Join Date
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    Crystal Lake, IL
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    Second that^^^^ Plenty of good quality used transformers for under $500. The size transformer you need is a very common size, which means they are found surplus, all over the place.
    Jeff

  9. #9
    Quote Originally Posted by Darcy Warner View Post
    Unless I am desperate, I will never buy a new transformer.
    Again, lots of used stuff available.

  10. #10
    Join Date
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    Modesto, CA, USA
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    used motor probably no more cost then used transformer of same horsepower.
    Bill D.

  11. #11
    Quote Originally Posted by Bill Dufour View Post
    used motor probably no more cost then used transformer of same horsepower.
    Bill D.
    Not to mention a ton simpler.

  12. #12
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    Good luck finding a metric large frame 7.5 hp motor with a shaft long enough to hold multiple sheaves. Probably cheaper to rewind but then you also have to redo the electronics. A used transformer should be under 500. the problem is always finding one close enough that the shipping doesn't kill you. Freight is cheaper now than a year ago so that helps a little. Dave

  13. #13
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    Quote Originally Posted by Chris Hachet View Post
    Not to mention a ton simpler.
    Except for changing the switches, starter and all the wiring

  14. #14
    Join Date
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    Quote Originally Posted by Bill Dufour View Post
    used motor probably no more cost then used transformer of same horsepower.
    Bill D.
    On a Martin? I think I would rather do the transformer. Dead simple to wire, just expensive to ship.
    JR

  15. #15
    Another possibility would be to get a dual voltage motor. If the motor that comes on the machine is a 9 lead motor it can be configured for the lower voltage.

    Phil

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