My Newb Plasma Table Attempted Build

tommylight wrote: Oh hell, my gray matter is gone to sh#t, had a bad headache all day.
My bad, G04 is pause
G64 Pn Qn is how much to wear off the original path.
Sorry Rod.

I thought it was just me. 8:00am and already 4 hours into the day here! My brain hurts too!

I now have plasmac installed. Followed thru the guide and was able to successfully fire the torch, and did the float offset and test. I believe I've set up the voltage scale and offset for THCAD-10 in the config tab correctly.

My first clue something wasn't right was when I pulsed the torch (just to see if I did the connections right). I noticed on the control panel in plasmac that the arc voltage reads a constant -32v. So, I unplugged the arc voltage connector from my box and put my multimeter to it and I'm getting (from pulsing) an observed voltage of 169.8v. I take this to mean that my voltage divider isn't working properly...and bear in mind I've never made anything like that before. I wired in a 1MOhm resistor to positive and another one to negative inside the plasma, and that goes to the respective +/- inputs on the THCAD-10.

I'm stumped.

Pat

Most probably you have reversed the input to the THCAD, the torch goes to negative or - while the clamp goes to positive or + on the THCAD

Thanks Tommy. I did put positive to J15 and neg to J16 in the plasma (Hypertherm Powermax 1000 g3). I should try swapping those around?

Pat

No you don't need to swap wiring. Try changing te sign of your encoder scale. If it is then countingthe correct eay worry about it from there.

But if you open hlashow and look at the encoder velocity pin at 0 volts, it should show your zero volt calibration reading. If its negative, its the scale, Get that right as the first step.

Yes, what Rod said.
Thank you Rod.