spindle wont come on

[HVYKVY]

I have GPIO4D running mach3, the spindle contactor is wired as per 9.3.1 in the manual. It does not come on when I program M3 in MDI or "press" the spindle Cw in mach3. Do I need to turn on something in mach3 ?.
Thanks
Kevin

[diycncscott]

Have you issued an "S" command in MDI?

Measure the analog output from the GPIO4D while commanding a M3 S1000, what is the voltage?

[HVYKVY]

Is this for the spindle analog output?. If it is it's 1.2 volts.

[diycncscott]

If you remove the wires coming out of the analog input to the spindle on the GPIO4D, what does the voltage measure now?

Increase the S command to S2000, now measure it. Keep in mind that the spindle must me ebabled (issue an M3) in order for the analog voltage to be output.

[HVYKVY]

I don't have any wires to the spindle analog, only to the contactors. The voltage at 2000 rpm is 2.5 volts
Thanks
Kevin

[please no smoke]

If you use relays only thern you have to specify them in ports/ pins, mill options I think, upper left corner.