Live voltage doesnt show anything

i bought the plug and play from langmuir, from razor cut 45, the cable goes thc to vim box div input, then div output to thc.

i have also went further to open the main controller and followed this step

the chip works as it should so no problem there.

is there a setting i might have missed? im just not getting any feed back from live voltage.
when im cutting, the z axis moves but doesnt show any voltage.
and also i always get this so i just turn off the thc, kinda sucks!

i also did my research on reversing the wires, did that but still no live voltage.
the main control box is isolated from the table. i have tried rebooting table and laptop which is not hooked up to the same power as the table.

i hope its something simple lol