| Electronics > Repair |
| Welder Tig AC/DC blown house fuses, shorted IGBT |
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| tokenpete:
Normally with torch in negative you can crank 200 amps with 30% balance and a 2.4 tungsten and it won't ball up. |
| tmazz:
A simulation with ltspice of the initial frequency and balance circuit shows a how cheap and nasty the design is. Not even a square wave but sort of a sawtooth where the wave is simply pushed up or down around ground (O volts) to adjust your EP and EN. |
| tokenpete:
You are simulating a circuit with it's load disconnected. Add the IGBT and accompanying gate circuitry and you will see a square wave. |
| tmazz:
Ah, my bad your right! |
| Njk:
--- Quote from: tokenpete on February 29, 2024, 07:31:49 am ---I have been fixing these machines for 20 years, they are like my babies :-DD --- End quote --- In that case you must be familiar with the Jasic machines, because it's a big manufacturer and the products are distributed worldwide under many different brands. But sometimes, for the same product, installed options are depending on the region. Actually, the option set is up to the distributor. Consider Jasic W212 model (known in NZ as XA-TIG200PRZ, see the image). Similar machines of 160A and 180A also exists. It's a DC-only welder that has digital and analog RC interfaces by the design. For some reason, only the models for NA, Australian, and NZ markets are actually equipped with the analog interface. While in all European models (even that of Wilkinson in the UK, AFAIK), all the related components are not populated on the PCB. So the users wishing to get that option have to install the missing components by themselves (and perhaps to adjust the firmware). With that purpose, I'd prepared the wiring diagram of the interface. Although it's perfectly possible to deduce the missing values from the schematics, it would be nice to know the original ones for reference. This is where the modern telecom can be helpful, isn't it? P.S. Sorry for drifting off-topic but some time ago I'd started a dedicated thread and no one responded |
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