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24th Oct 2016, 12:33 PM #46Most Valued Member
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Can someone please tell me if this is correct to wire it up as 240v?
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24th Oct 2016, 02:02 PM #47Senior Member
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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
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24th Oct 2016, 03:06 PM #48Most Valued Member
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Thanks Roger, Yeah the cover is off the welder
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24th Oct 2016, 05:44 PM #49Most Valued Member
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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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4th Apr 2020, 04:38 PM #50New Member
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- Apr 2020
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- Brisbane
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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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