No arc voltage

Hi again,
Hoping someone can steer me in the right direction. I successfully installed Plasmac (i think) and when testing torch on or running a test cut my torch fires and axis all move however i do not get any arc voltage readings. It just reads zero on main screen. I checked wiring and changed a few things with no success and I'm back to square one. I'm using an Everlast cutter for now with divided arc voltage selected. The other thing i noticed is after a test cut the thc up light comes on and moves my z axis all the way up until it hits the soft limit and machine turns off. After this happens i cannot repeat a test cut without closing out of program and re-starting.
Thanks

Most probably, wrong polarity on the THCAD input.
Are you using THCAD?
What board?
More info?

I am using thcad 10 with 7i76e. I will double check polarity and verify. Thanks

Did you set the scaling and offset ?
Although, even without setting those it should show voltage values on screen, usually something negative.

No i haven't touched those. it was at 1.000000 voltage scale and 0.000 voltage offset default setting I'm guessing. This is the stuff where I'm lost with these settings. I did check polarity and it is correct according to the everlast manual pin outs and the + - connections at the thcad

the two basic things to check. Is the light on the thcad flashing? does it get faster if you connect a 9 volt battery?
If not fault is in the wiring to the THCAD
Next, is the encoder velocity pin hovering around 3800 at zero volts and is it a  positive number? 
If negative, change the encoder scale.
If it is a static number, you have a wiring priblem between the thcad and the mesa card.

Finally, note that when the Everlast is set to 16:1 divider, the thcad sees it as 24:1 (1.5x multiplier). This is because the thcad thinks the everlast voltage divider resistors belong to it. But it is a good range for the machine.(240v max scale)