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Running the UMC from a 4 pin outlet 3 phase

Discussion in 'Australia & New Zealand' started by eclectricdave, Apr 17, 2016.

  1. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    112
    Location:
    Malbourne Australia
    Occasionally we will come up with 3 phase power but only 4 pins L1 L2 L3 & E. The Tes neads a Neutral. This pin is virtually at ground potential. I removed the 3 pin adapter and used solar fittings to access the pins on the other end of the adapter A 4 pin plug was used to test the idea first. We used a 12kVA Diesel gen set which had a neutral in the 5 pin. Base. NB a 4 pin plug will go into a 5 pin base of same current rating. We tested first with a 50k resistor and the machine neutral. Next we removed this and connected a three phase induction motor rated at around 1 hp. This was wired in star and its neutral was connected to the adaptor neutral connection. It worked fine but we could only draw 10A per phase. We couldnt get any of the other phase pins to work on single phase except L1.when tried on single phase. You can also get N from a set of single phase transformers or a 3 phase tfrm but it is a little technical. If anyone wants more info and or pics pl contact [email protected]
     
  2. RichardMcN

    RichardMcN Member

    Joined:
    Mar 12, 2016
    Messages:
    380
    Location:
    Sydney
    Interesting Dave,

    So many questions ...
    • So are you are saying the 3 phase motor was the successful implementation?
    • What was the logic behind an induction motor as opposed to a transformer?
    • What did you do with the rotor - locked? free? loaded? absent?
    • Why do you think you only got 10 A when you would expect 17 A from 12 kVA gen set? The 1hp (0.75kW) motor should only take 2A or less (unless locked or no rotor).
    • Etc!
     
  3. Chris TX

    Chris TX Active Member

    Joined:
    Sep 30, 2013
    Messages:
    1,482
    Location:
    Dallas, TX
    UMC doesn't use neutral. Just make an adapter with L1, L2, and Ground/Earth. And yes, since this is a generator that will probably have a floating ground, the GFCI will give you a red light. Ground will need a resistor to one of the legs (L1). Lots of info on the web for this generator "trick". Cheers!
     
  4. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    112
    Location:
    Malbourne Australia
     
  5. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    112
    Location:
    Malbourne Australia
    We use 415 L-L in Aus & NZ. Our UMC is different from yours. The Diesel set I mentioned was for testing only. Your scheme is for obtaining around 200V single phase from L to L with G & N connected also.
     

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