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  • 3 phase power

    looking to run a delta welder 450 3 phase using
    a roto phase i do not have 3 phase
    does any one know how the welder will work
    i am aware of the size unit needed

  • #2
    I would imagine it would work just fine... I just can't see how you're going to save any money using this delta welder... rotary phase converters aren't cheap... did I mention they're LOUD...

    A couple of years ago we put up a building that had a phase converter for their test lab (50HZ for the stuff headed to europe)... The things sound like a siren that NEVER shuts off!
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    • #3
      phase converter

      we have a 15 hp phase conveter now its not loud it sounds like a motor running

      i want the delta for its power and duty rating 400 amp mig
      we only have single phase .no single phase welder does that
      the electric co wants a small fortune for 3 phase around 30 k

      i was told a 50 hp roto phase would work

      thanks jeff c

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      • #4
        If your phase converter is making anything other than smooth motor whirring sounds (with the exception of the couple seconds after you add an unbalanced load to it), there's something wrong with the converter's wiring, components (balance caps), or the motor's bearings are probably dry or toast.
        Last edited by Fishy Jim; 12-28-2008, 05:04 PM.
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        • #5
          the one I was talking about was a couple hundred horsepower..... I've never seen an electric motor over 50HP that I'd call quiet....
          Bobcat 225NT
          Cutmaster 52
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          Caterpillar TH63
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          • #6
            A couple hundred horsepower phase converter? For the price of the motor, that 30K install bill would be cheap...

            Got any pics? I'd love to see the start cap array for that.
            Syncrowave 250DX
            Invison 354MP
            XR Control and 30A

            Airco MED20 feeder
            Thermal Dynamics Cutmaster 81
            Smith O/A rig
            And more machinery than you can shake a 7018 rod at

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            • #7
              Originally posted by Fishy Jim View Post
              A couple hundred horsepower phase converter? For the price of the motor, that 30K install bill would be cheap...

              Got any pics? I'd love to see the start cap array for that.
              well... it wasn't actually a phase convertor... it was a rotary frequency convertor, custom designed by them with a 3ph 3000rpm motor to give them the 50hz 3ph they needed to test their european product... same basic idea, just wired a little different....
              Bobcat 225NT
              Cutmaster 52
              Lincoln Weld-Pak 100 buzz box
              Caterpillar TH63
              '07 Kawasaki ZZR600

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              • #8
                Not sure if it would work on a welder but I use a variable frequency drive [vfd] to run my three phase vertical milling machine on single phase power . Vfd's work very well for my application with the mill as the don't have any of the negatives of a phase converter .
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                • #9
                  Originally posted by Showdog75 View Post
                  Not sure if it would work on a welder but I use a variable frequency drive [vfd] to run my three phase vertical milling machine on single phase power . Vfd's work very well for my application with the mill as the don't have any of the negatives of a phase converter .
                  I don't know if a VFD would care for the spikes every time you strike an arc...
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