Yeah I would be ok with invalidating the warranty,as long as I don’t make it go bang . Where on the wiring diagram should I wire it? Also is it just a live /neutral and earth ?In principle, yes. It needs to activate when you pull the trigger, and cut off when you let go. Looking at the wiring diagram, you can wire a 230v ac valve across the bridge rectifier after the incoming relay. On eBay, something like this...
https://www.ebay.co.uk/itm/30133093...MtL0Gz0Sna&var=&widget_ver=artemis&media=COPY
Make sure to wire it to the AC side, not the DC side else it'll likely go bang.
Given it's a new machine, are you happy to invalidate the manufacturer warranty? Wfiw
Ok thanks Eddie,The relay circled in green on the diagram is the soft-start relay. After a brief delay, it shorts the resistor or thermistor which limits the inrush current to the smoothing capacitors. So I am sorry but the rectifier will effectively have AC mains power as soon as the machine is powered up.
As I said:
"If you really wanted to, you could fit a gas solenoid ( space allowing ), then rig up a suitable add-on power source for it plus a trigger circuit driven by the wirefeed motor supply".
I would hesitate to take the power for a DC gas solenoid from the machine; an AC-mains-powered solenoid would be OK.
The trigger would have to accept anything from 5v to 30v from the supply for the wirefeed motor, and maybe include an optoisolator for complete separation. I think there will be suitable Chinese "trigger & relay" boards on eBay.
The choice of power source depends on the voltage of the gas valve. The solenoid that you found can be specified as 12v DC, 24v DC, 24v AC, or 230v AC mains, so the external power supply would need to match that. The easiest is to select the 230v AC mains version, then it can be wired across the same mains as the supply to the welder.what kind of power source
So today a thing happened I was using the welder and without pulling the torch trigger the gas is flowing about 1mb I have to shut my flow valve off otherwise I’m waiting my gas. If Eddie could see how I can trigger the valve from the drawing I’d like to add a gas valve in the machineThe choice of power source depends on the voltage of the gas valve. The solenoid that you found can be specified as 12v DC, 24v DC, 24v AC, or 230v AC mains, so the external power supply would need to match that. The easiest is to select the 230v AC mains version, then it can be wired across the same mains as the supply to the welder.
[ A solenoid that works on DC would need a small 12v or 24v DC power supply. A rating of about 1 Amp would be enough. However, I can't see there being enough space inside the welder to install a power supply, it would have to be attached outside.]
To activate the solenoid you need a trigger circuit. This would switch the gas on when, for example, the wirefeed motor starts up. For a mains solenoid valve the simplest trigger would be a relay, controlled by the wirefeed voltage, but that can vary depending on the wire speed setting, so it needs some electronics too.