Home built TIG footpedal: need 14 pin wiring

Jun 23, 2004 2 Replies
J

I've built a foot pedal with a pot and a switch. It's for a Thermal Arc



250 GTSW which has a 14 pin connector. I've measured the voltages on the connector and found more wires than expected. Can someone tell me what the pins are used for. I would like to know what all the pins do, even the ones I don't need for the foot pedal, if anyone knows, as I plan to build a pulser for it latter. I've called Thermal Dynamics twice and they said they would send me the manual but so far nothing has arrived. Here is what I measured with my VOM: Pin Reading A 25.9 VAC B 0 V C 0V D 0V ( Approx 0 Ohms to ground ) E 0V F Not connected G 0V ( Approx 0 Ohms to ground ) H 42.9 VAC I Not Connected J Not Connected K Not Connected L 120 VAC M 5.1 VAC N 4.3 VAC I was surprised to find no DC voltages.

Thanks for any help you can give Jack


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J

did you try measuring BETWEEN the pins, rather than relative to the machine's case (or the work clamp)? I am guessing the internal logic is floating, or possibly "grounded" to some particular terminal inside the welder.

Jon

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K

There may not be a DC voltage for the pot if the switch isn't made. I don't know anything about your welder but I was curious enough to do a bit of research. I couldn't find your specific model on their site and nearly every similar model uses an 8-pin connector but I did find one model that uses a 14. You can see the pinout for it on page 72 at:

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It seems to agree with your list for the most part but where you show 120VAC on pin L it says it's not used.

Hope it helps!

Best Regards, Keith Marshall snipped-for-privacy@progressivelogic.com

"Even if you are on the right track, you'll get run over if you just sit there." - Will Rogers (1879-1935).

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