On Wednesday, March 09, 2011 10:14:39 AM Tony Zampini did opine: > Hi all, > > I'm attempting to set up EMC2 to generate a PWM > signal for spindle speed control. I put a DVM on the > PWM parallel port pin in hopes to see an average > voltage of the PWM signal. But all I see is about 90mV, > and it never changes. > > I tried MDI commands like: > > M03 S100 > and > M03 S2000 > It is my finding that the line sequence counts.
IOW: S100 M3 or S2500 m3 Always works. You must set the speed at least a line prior to issuing the M3 command. You will also need to set the pwm generator up in your .hal file, which in my case (I'm using a 4 axis xylotex/pmdx-106 interface to the speed controller that was in the gear housing of my mill, but which now lives in a box with the pmdx-106) loadrt pwmgen output_type=0 addf pwmgen.make-pulses base-thread addf stepgen.update-freq servo-thread addf pwmgen.update servo-thread net spindle-cmd <= motion.spindle-speed-out => pwmgen.0.value net spindle-enable <= motion.spindle-on => pwmgen.0.enable net spindle-pwm <= pwmgen.0.pwm setp pwmgen.0.pwm-freq 100.0 setp pwmgen.0.scale 3833.33333333 setp pwmgen.0.offset 0.173913043478 setp pwmgen.0.dither-pwm true net spindle-ccw <= motion.spindle-reverse net spindle-ccw => parport.0.pin-14-out net spindle-pwm => parport.0.pin-16-out This is the order they occur in my file, but there may be other non-spindle related items intermixed. A side comment that could be called a bug exists in my setup with the above scale factors because the pwmgen is designed to run at say 1% duty minimum, to maybe 98% maximum, but because the pmdx-106 uses the activity of the signal as its enable, asking the pwngen for a 100% duty cycle leaves it sitting high, so the activity sense is lost and my spindle drops out and stops. At a spindle speed over ride of about 105%. > I'm fairly new to EMC2. Can someone tell me > what is required to activate the PWM output? > > Thanks! > Tony > HTH, Tony, and welcome to the list. > ------------------------------------------------------------------------ > ------ Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> We prefer to speak evil of ourselves rather than not speak of ourselves at all. ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
