Re: Strange control problem -- SOLVED!!! -- 3 phase "firing system"

On Wed, 17 May 2006 14:06:30 GMT, Ignoramus10275
<ignoramus10275@xxxxxxxxxxxxxxxxxxxx> wrote:

On Wed, 17 May 2006 13:32:03 GMT, Glen Walpert <gwalpert@xxxxxxxxxx> wrote:

Did you see a picture of my first weld?

http://igor.chudov.com/projects/Welding/11-New-Rectifier/dscf0255.jpg

Yes, those look at least as good as your practice welds with the
original welder. Did you notice any difference in the arc between
then and now?

Someone also said something interesting, that I likely have too much
inductance in the reactor for MIG. Does it make sense to you?

That is indeed possible and would show up as an erratic arc and
problems sticking the wire as current fails to increase fast enough
when the arc shortens or vice-versa. I would try it first and if it
dosen't work well try winding a smaller inductor. Possibly on your
interphase transformer iron?


Well, I could, I suppose, just tap into the middle of my reactor,
right?

Sure, or you could put in several taps for an adjustable reactor if
you can get at the windings.

I redid some things more nicely, now there is extra 120V power in the
welder, switched by the same switch as the main 3 phase contactor. It
will power the water cooler outlet on the welder, the fan, 12VDC power
supply, the PCTI controller, etc.

120V used to be produced by the welder's controller, but it cannot
work this way, now that I converted to a three phase rectifier. I
could use some 230v->115V transformer, but it would need to be
relatively big (run the fan motor, the tig cooler, etc) . So I simply
get 120V from an outlet. It is switched by the same switch as the main
power contactor.

That works. If you were expecting anyone else to ever service it you
would want a "CAUTION - Powered from multiple sources" label on the
cover, to let the service tech know to disconnect all of them.
.

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