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  1. #46
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Can someone please tell me if this is correct to wire it up as 240v?
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  2. #47
    Join Date
    Jun 2016
    Location
    Sydney
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    283

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    Assuming the black lines are where you intend to put the bridges, it looks right to me. There are two bridges available in the photo, so that's good.

    Always a smart trick to test the thing out on a circuit with a magnetic breaker. They can open much faster than a fuse.

    (I do hope those terminals are normally covered! I expect so.)

    Cheers
    Roger

  3. #48
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Thanks Roger, Yeah the cover is off the welder

  4. #49
    Join Date
    Aug 2009
    Location
    Sydney, NSW, Australia
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    1,836

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    I just went back and seen the guy who sold me the welder and i purchased the TIG box and just plugged it in and it works

    a vintage 230amp AC arc welder and AC high frequency TIG box both for $100 how can u beat that this is the cheapest aluminium welder i have ever purchased

    old mate said he has another AC high frequency TIG box for $50 but i was out of cash so had to leave it

    only one problem is the HF box zaps continously so could become irritating

    i also thing i still need a MIG to weld my boat
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  5. #50
    Join Date
    Apr 2020
    Location
    Brisbane
    Posts
    3

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    Quote Originally Posted by gazza2009au View Post
    Hey Guys, is it as easy as running a 3 phase motor as a generator powered by a single phase motor to run 3 phase power out in the shed?

    are there any complications? i have been looking online at making one but thought i should ask first

    looking to power 3 phase lathes and older mode 3 phase welders and tools

    https://www.youtube.com/watch?v=FeH580M336c
    Get this book for around $20-$25 AU, Its excellent, explains 4 methods of getting 3 phase from single phase.
    Three-phase Conversion by Graham R. Astbury

    But you'll need a hefty 240 -415V step up transformer for most conversions.
    I bought a 10 kva 3 phase 240-415V transformer from ebay some years ago.
    I reconnected it for single phase, i.e the 3 coils in series, I step up from 240 to 415, then with some capacitors I run a 10kW 3 phase motor as my 3 phase converter. You'll also need a temporary starting capacitor on a timer or whatever to start the big motor. Then this capacitance drops out and you end up running on the run caps. Roughly 70uF per hp.
    Put a typical load on the converter such as mill or lathe under load, or strike an arc on the welder and tune the caps FOR THIS PARTICULAR LOAD. The caps will need to be varied for different loads. You can make banks of two or three sets of caps for each load you decide to run, and connect them in and out as required. Watch out for arcing when you switch in and out. Tuning the caps is a balance between voltage and current, current balancing may be just a little bit more important, so you'll need a clamp meter to measure current. Current is heat, and heat is dangerous to cables and wiring.
    I can individually run a 4kW compressor, 10hp lathe, 350 amp welder, yes a 350A welder! and my cylindrical grinders (with 3 motors each) . I only worry about blowing the primary fuse out on the pole. With the welder I use about 70A single phase, don’t turn the stove or oven on as you will most likely blow the primary fuse on the pole.
    Theres a fellow in NZ who makes the capacitor switching boxes, I forget his name, its "Euro--something" , EuroTech perhaps. He's not cheap, not expensive either, but I ended up buying a box from him about 5 years ago, and its still working fine.
    All I do now is switch on the converter and everything else is sweet.
    Shane,
    Brisbane

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