Originally Posted by
jim_cliff11
Thanks for the replies Macy and HypHyDef. Sorry it's taken me a while to reply!
I've managed to get the THC working to a fashion. Turns out the screw terminal for pin 2 (right hand block) in the plasma interface box (Assy-0215) will not tighten as the threads knackered. The wire end is basically floating inside the terminal with a poor connection. I've packed it for the time being and it seems to be working, but occasionally the torch still dives. I'm not sure if this pin is related to the arc voltage or it's coincidental that THC has started working.... albeit temperamental.
Which is the arc sensing LED?
When the THC is working during a cut the screen shows the actual arc voltage which hovers around the set voltage point. If I increase the set arc voltage the torch lifts, and vice versa. Which is suddenly drives I find myself frantically trying to stop the machine before checking the actual arc voltage to see if it shows zero.
Is it difficult to calibrate the arc voltage? I'm fairly handy with a multi-meter, but not sure of the process to calibrate.
Thanks,
Jim