Quote Originally Posted by toby View Post
Hi Jazz yes I did use the command when testing m3 s10000 . This would then make a clicking sound and the relay light on the BOB would come on.
Ok well so sounds Mach3 is set up correctly for ON/OFF so now check you have voltage coming out from speed control. Command half the speed you setup the spindle pulleys for and should get close to 5v.

If this works then check parameters in VFD are set for External ON/OFF and Speed Ref. If yes then it must be a wiring issue or the Digital input your using is set for another function so check this also.