Quote Originally Posted by Doddy View Post
Be bold :) Just wire it up. There's not much that you can do via ribbon #3(+) / #4(-) to cock it up. #3 to P1, #4 to gnd.
Well, tried that, (pwm to wire 3) the spindle fires up and goes to 3500rpm (when s250 m4 is mdi input on mach3)

Altering the s value makes no difference to the spindle rpm, (i.e. s25 gives the same 3500rpm!) although the pwm output voltage does alter accordingly...

any more ideas?