Found at dump, Thermal Arc LT-300, brought it home without looking at
it closely. Turns out to be 3 phase 460/565V. I have 3 phase 220v via a
3hp rotary converter. Is there a way to make this all work? I have no
idea if the welder has a fired board or something anyway, but it may be
that the last guy just didn't have 460V either. The cord has been cut
off. Or should I just take it back to the dump?
Scott
I would say that the biggest bang for the buck would be to take it
apart and see if there is anything obvious that could be easily fixed,
if not, it can probably be parted out profitably. Your 3 HP converter
is too small to drive it and you'd also need a transformer, which is
becoming too much of a hassle.
If you are in IL, and decide that you do not want to waste your time
parting it out or fixing it, let me know, I may take a stab at seeing
what can be salvaged.
i
Open it up, clean out the big chunks, blow out the little ones using
compressed air and a paintbrush as encouragement when necessary. :-)
Then get in there with a strong light and look for obvious signs of
"blowed-upedness". (Yes, it's a new word - we like doing that in
English. It's the past tense uncertain of blowed-up.) ;-P Use
your nose, many blowed-up components are easily identified by scent.
(Somehow, stuff like that sounds better with a patently fake-
sounding Southern Accent slathered on. But that's just me.) ;-)
Don't waste time trying to fix it or develop a way to power it at
home, that will be a big waste of time - especially if you don't even
know if the stupid thing works yet.
Go find a friend or acquaintance with an industrial shop somewhere
close that has some utility supplied 480V 3Ph you can borrow, scrounge
up a set of cables, and see what happens when you try powering it up
and striking an arc. Who knows, it might only have a small problem
that can be fixed cheap - plug the loose cooling fan cord back in and
replace the one diode that overheated first.
The ideal friend would have recently moved his fab or welding shop
into to a bigger building with a 480V 3Ph Utility feed, and he's been
running his old smaller rig looking for a big 'un just like you found.
You walk in with that monster and watch him turn green...
Swap straight across for his old 240V 1Ph rig that you can plug in
and use at home, with visitation rights reserved for when you have big
jobs that need a big welder.
-->--
Follow up:
I took the cover off, looks like someone had already (a couple of
screws missing from the cover), and found no signs of any blowed
uppedness. I did find, however a broken off zener diode, which fell out
of the bottom. Maybe that's all that's wrong with it, or not. I guess
I'll sit on it for awhile, if I ever run across someone with 3 phase
460V, I'll replace the diode and see if it works.
Scott
It is a manual for a similar tig welder. LS-300. I think that the
difference is only that your unit has high frequency and that one does
not, but double check.
there are many diagrams, schematics, etc. Worth checking.
The boards likely run on some standard voltage like 15 VDC or some
such. If so, you can try powering them or some such, at your risk.
i
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