I have a Hobart CyberTig 200 DC-S welder. It is a 3 phase 200 A rated SCR fired, transformer based TIG welder.
I have a PCTI's 3 phase firing circuit that is made to control any SCR fired, transformer based, 6 SCR power supply, by specifying current and voltage with potentiometers.
It is shown here:
The nice thing is that, it seems, it can be wired without disturbing too much in the welder. All I need to do is unplug the current Programmer controller, add some piggy back terminals, and connect this circuit in. I would start with a simple control for CC and then expand a little bit by making it control valves, HF and switch from CC to CV. (CC is set by specifying max voltage as OCV and controlling current with a pot, whereas CV is set by specifying max current and controlling max voltage with a pot).
My question for now is this: Is this CyberTig actually a 300 A, 60% duty cycle welder, controlled to run at no more than 200 amps, or is it really a 200A max welder. It is specified to have 100% duty cycle at 200A.
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