I have one of the cheapy 50a (yeah right) chinese touch and lift plasma cutters. I also have a good hypertherm, but I had this one first and kept it for my students to practice on (cause I must not like them, haha).
After sitting a while, the air solenoid isn't actuating when you press the trigger on the torch. Machine turns on with lights and fan as it should when you press the power switch. When you press the torch button, you can hear and see the spark being generated inside the machine, between the two metal points. However, there's no air.
The solenoid says 24vdc on it, and when I unplug the part where it connects to the control board and put a multimeter on those pins of the control board, I'm getting 26vdc all the time the unit it on. So, it seems doubly strange to me. First of all, there shouldn't always be power on those pins, only when you press the trigger (plus the 5s post flow after you let it go), right? Second, if there is power on those pins, why isn't the solenoid open all the time? Is it likely I have both a bad solenoid (not opening when given power) and a bad control board (sending power to the solenoid when it shouldn't)? Doesn't seem too likely they'd both have gone bad while the machine sat. Anything's possible, I suppose.
I don't have any love for this machine after getting my hypertherm and realizing what a real plasma cutter looks/works like - but if this is just a bad $20 solenoid, it's probably worth fixing.
Anyone been down this road before?