I have recently set up my old denford orac lathe with mach3. All seems well apart from spindle speed. when the spindle starts up it reads it as a - figure. ie if i input m03s1000 in the mdi page it says the speed is -1000rpm. Ive changed debound settings and tried active low/high. Ive set up the spindle pulley to min 200 max 2100. I'm mega lost on this. anyone got any idea's??