Hi bwservices, yes they often use such bleed resistors in smpu (switch mode power supplies) which are very common these days. They also use them in microwave ovens since they are potentially lethal (very high voltage but low impedance = high current) and indeed we had an engineer killed with one...
Hi rtbcomp, I don't know the answer to that, but I assume he must have seen it when welding since the relay should be open unless the gas is flowing? The control panel etc, as you no doubt know, is powered by a small second transformer derived from the mains before this relay. I don't know much...
Many thanks Rtbcomp, sounds like a good idea but we shouldn't have to modify the existing circuit. Yes, I did mean the mains input contactor/relay to the primary of the main transformer
Thanks Mike, yes I worked out that the contactor or relay which ever you prefer, simply switches the primary...
Hi,
I have come on this site to try and help my local garage, who are doing some work for me, when I mentioned that my background is electrical/electronic engineering (now retired) and he asked if I might know what was wrong with this welder. Well, it's a bit of a specialized area, but hope...