415 Volt D.I.Y. Phase Converter Idea's For Australia - Page 3
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  1. #41
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    Hi Laurence,
    The notes in this LINK, post number 3, are on a CIG Tradesman transformer and your transformer's connection block is a mirror image of that.

    Don't forget to put the bridge between F1 and S2.

    Would you let me know what brand and model welder this is for?

    Just a quick note on run capacitor balancing experiment with 60%/40% like 30uf/20uf for example.
    Note... T = Tap, you will notice the two conductors in one lug at T terminal.

    Jim


    Welding Transformer 415Volt Suit R.P.C.
    Attached Thumbnails Attached Thumbnails scan_20200404.jpg   scan_20200404.jpg  

  2. #42
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    Had a little progress today , and a failure as well
    Seems the 4kw motor is drawing too much and tripping my breaker . Runs for about 6 seconds and trips…
    Got 415v and 480v out of the welder I picked up , I went with the orange tradesman one Jim linked earlier ... wired it up as per drawings in previous post and spun the motor with a ‘rip cord’ type start
    I’m thinking of getting a circuit put in from the hot water service as it’s 35amp

    Here’s a question though : my friend says this is no good and I should stop immediately! This setup won’t produce 120 degree separated 3 phase they will be 90, 90, 180... and this will cause the machine to sit there and hum with no torque and overheat/melt the drive motor !

    Is he correct?

  3. #43
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    Hi Ads,
    Your friend is incorrect.
    Of course a 3 phase motor will run from single phase once started, and the 120 degree-90 degree phase angle does not even come into what we are talking about.

    Jim

  4. #44
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    Nameplates, diagrams, the breaker size, and clampmeter readings could be helpful. Check there's nothing else on the same circuit.

  5. #45
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    Hi Jim
    I know it works I had it running ��
    I think he meant whatever I power with it would die … at any rate my response was this is a know workable design

    Someonesomewhere nameplates of ? Diagrams of what ? Breaker is 20 amp and has lots more than just my garage on it
    Don’t have a clamp

  6. #46
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    Nameplate of your motor. Diagrams of the inside of the motor's terminal box and what you have connected to where.

    I am not sure how to correct for the single-phasing effects etc., but a 4kW motor on 230V three phase likely draws ~14A before you consider transformer inefficiencies. Running at less than full load will reduce that but running on single phase will do the opposite.

    Add some margin for starting current because with no rotating field it will be a very slow start, and you're likely near/over the limit of a 20A breaker before you consider any other loads.

    I expect you need a dedicated 25A circuit to even consider this, along with proper test equipment.

  7. #47
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    As described above wired per drawing above
    Attached Thumbnails Attached Thumbnails image.jpg   image.jpg   image.jpg  

  8. #48
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    Hi Ads,
    That motor is connected in Delta, it needs to be connected in star for 415v operation.


    Jim

  9. #49
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    Gotcha so shunts across the top 3 and then ?


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