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    277 Volt Circulator pump (8 Posts)

  • Prisco Prisco @ 5:27 PM
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    277 Volt Circulator pump

    I just had a customer call and ask me for a 277 volt circulator pump . Single phase , will 230v work or not? I am thinking that if the building has 277 volt/1/60 it can utilize a 480/3/60 pump perhaps . Would appreciate any help here.

    Prisco
  • Ironman Ironman @ 5:37 PM
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    230V...

    Won't work. It will fry the windings.

    You can probably get the motor, but it may take a little time. What size are we talking about? Can you give the specifics?

    You could probably find a 120V or 208V source somewhere nearby in the building. Or use a step down transformer in a worst case scenario.
    Bob Boan



    You can choose to do what you want, but you cannot choose the consequences.
  • pipeking pipeking @ 6:10 PM
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    I DON'T

    THINK 230 WILL WORK ON 277 CUZ 277 IS LINE VOLTAGE. THE DIFFERANCE IS THAT 277 IS 1 SINGLE HOT LEAD AT 277V, AND 230 IS 277 STEPPED DOWN TO 220-240V (230 ALL THE SAME) WITH TO HOT LEADS AT 110-120V. SO A 277 MOTOR WILL HAVE A HOT/NEUTRAL, AND A 230 MOTOR WILL HAVE HOT/HOT/NEUTRAL-GROUND.
  • pipeking pipeking @ 6:18 PM
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    SORRY 4 THE CAPS, AND

    if u tried to use a 480/3/60 with only 1 phase it will overheat, nodoubt. why does it have to be 277v? is the pump that he has now is 277v?
  • SWEI SWEI @ 7:11 PM
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    277V single phase

    only exists in a 480 Wye system, so there is 480/3ø in the building someplace.  It's hard to find 480/3ø motors smaller than half a horsepower so as Ironman pointed out, it really depends on the pump.

    ECMs are typically limited to 250V supplies, which is unfortunate since they could quite easily be designed to run on 90-300V, making them applicable to pretty much any AC power system on the planet.
  • BobC BobC @ 7:44 AM
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    Transformer?

    Assuming it's a reasonable sized pump you could pick up a transformer to convert that 277 down to 120 and use a standard pump. Just make sure the transformer is big enough for the wattage you need.

    Transformers are not cheap but probably not much more than a 277v pump.

    Bob
    Smith G8-3 with EZ Gas @ 84,200 BTU, Single pipe steam

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  • Zman Zman @ 11:41 AM
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    No such thing.

    I think your original thought is correct 480/3/60 is what you need. 277 is the voltage of one leg of a 480 3 phase just as 120v is one leg a 208v 3 phase (think cubed root). I don't believe the product he suggested exists. I have seen systems with  480/3/60 in both wet rotor and 3 piece floor models.
    Carl
  • pipeking pipeking @ 10:29 AM
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    prico

    what did u do?
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