Hi Jan,I know this is an old thread, but when you google on the internet, it looks like this is the only info you can find. I'm making a pedal for my Kemppi. This thread helped me further.
In te drawings of Gavin, the switch is between 5V ref (G, the centre pin) and D. This didn't work on my machine (Kemppi Minarc TIG). I needed to switch it to ground, just like the drawing Hans posted. I also used a NO (normally open) switch, just to be precise. So without trying being an ass, I think that's a little error on the schematic (yellow post-its).
The extra 10K resistor (also post of Gavin) was very useful information though. This resistor is used to recognize the pedal (in combination with the 10k pot). That would explain "and identification" from the previous post in this thread. Without this resistor the machine things it's just a remote pot like the R10. With the 10K resistor, my machine refuses to go in 4T modus when pedal selected, as it should. Without it it just goes into 4T mode, which is weird with a pedal
Just wanted to share this info and make this thread complete.
Hi Dennis, I like your foot pedal. Would you have some more photos of the inside of the pedal. I have built one from a wooden base I like the rubber belt on the pot . Rgds sam.That's a nice improvement then, I ended up moving all the electronics to a separate box for said reasons, also a lot more room for the circuit in there.
https://c2.staticflickr.com/4/3942/33370401502_6f7dc0439d_b.jpg
https://c2.staticflickr.com/4/3956/33143759380_4672150b24_b.jpg
Not sure about this machine but on my home built pedal the big challenge for me was making the min/max circuit that was on the pedal, I have to flip a switch to remote controller mode and that disables the machine amperage knob.
Mine is an older machine but looking at the modern RF-11 pedals they too have the min-max settings on the pedal. If I were to make the pedal without the min max setting and just a 10k resistor it would work but span the machines entire range of 10-300A and no possibility to adjust it. I was under the impression modern kemppis worked the same way.
I suppose the pro of that is you can set a range between any two values, whereas on most other machines you can only set the max current.
Hello Fred.
I did not build the pedal. It is a SSC-pedal.
I only soldered the transistor to the connector.
Regards Hans