I am wondering if the small valve fitted to the disposable bottles is actually a regulator, I had assumed it is just a valve as the output drops with the cylinder pressure (ie if I set it really low on a new cylinder the gas stops after a while and needs turned up a bit). I therefore thought the pressure would build up when the valve is closed, perhaps its just a rubbish regulator.
The mains transformer is not switched on/off, there is no relay to do this in the above diagram or photos nor my Telewin (very similar inside). When you turn it on there is a big thud and hum from the transformer the tip remains live at 36-43V depending on setting. There is only a very small board for the wire feed (no relay) connected to the welding secondary (after the rectifier) and the trigger. This is what I expect for a live torch. The trigger simply provides secondary voltage to a variable voltage regulator which drive the feed motor. I'm just taking this trigger connection to another fixed regulator (well a variable regulatory with a semi-fixed adjustment) to drive the solenoid. I think the 2nd regulator is the bit people have been having difficulty with (or not knowing that it would be needed). Most standard regulator modules you can buy can't cope with the wide voltage range, I had to buy the component and may my own module. I'm guessing the wire feed regulator is the same type.
To be honest I don't get all the components in the above diagram, what is M1AC and what is K? My diagram is missing this. I'm guessing K is the contactor you are talking about, but it appears to be fed (powered) by an additional transformer. I wouldn't not expect this is in a live torch. However the wire feed diagram is the same, in my case it is powered by the always live secondary and switched by the trigger.
The mains transformer is not switched on/off, there is no relay to do this in the above diagram or photos nor my Telewin (very similar inside). When you turn it on there is a big thud and hum from the transformer the tip remains live at 36-43V depending on setting. There is only a very small board for the wire feed (no relay) connected to the welding secondary (after the rectifier) and the trigger. This is what I expect for a live torch. The trigger simply provides secondary voltage to a variable voltage regulator which drive the feed motor. I'm just taking this trigger connection to another fixed regulator (well a variable regulatory with a semi-fixed adjustment) to drive the solenoid. I think the 2nd regulator is the bit people have been having difficulty with (or not knowing that it would be needed). Most standard regulator modules you can buy can't cope with the wide voltage range, I had to buy the component and may my own module. I'm guessing the wire feed regulator is the same type.
To be honest I don't get all the components in the above diagram, what is M1AC and what is K? My diagram is missing this. I'm guessing K is the contactor you are talking about, but it appears to be fed (powered) by an additional transformer. I wouldn't not expect this is in a live torch. However the wire feed diagram is the same, in my case it is powered by the always live secondary and switched by the trigger.