I find why thc doesnt resd voltage, I reverse the 2 wires. Work peace clamp are the + and the torch are - . I still have the proplem when the torch pierce, the programe stop and stay at this point. On mach configuration , i enable thc on setting and input works on test mode ,so they are ok !? If I desactivate thc botton on mach screen, i can cut completely the part but thc not works