Progress report on the WIN-XP/MACH3 to LinuxCNC/7i92H conversion: With six steppers declared: loadrt hm2_eth board_ip="192.168.1.121" config=" num_encoders=0 num_pwmgens=0 num_stepgens=6"
I have control of X,Y,Z and the rotary A. Additionally a step motor instance is used as the charge pump on DB-25-17. And the last stepper object is on the second parallel port creating the correct frequencies to run the Bergerda 1.8kW AC Servo up to 3000 RPM. Still need to create an adaptor board to change the TTL into RS422 before I can actually turn the motor but that's a minor point. My Agilient programmable waveform generator shows the motor responds nicely all the way up to 3000 RPM. But not everyone has a slick AC Servo for a spindle nor a second parallel port. A VFD like a GS-1 that I have on my South Bend Lathe or a GS-2 that a friend has on his Bridgeport clone (run with MACH3) doesn't take step and direction. Instead PWM and a PWM to 0-10V signal converter is used. For some reason I can't convince the pncconf to create a PWM instance with the 7i92H. Not sure why. The 7i92H is programmed with the 7i92_C11Gx2D.pin configuration which puts a PWM out onto DB25-14. 14 1 IOPort PWM 0 PWM (Out) And direction 16 5 IOPort None So I can see I have to manually edit the hal file to have num_pwmgens=1 But what to do next? Unfortunately http://linuxcnc.org/docs/html/config/pncconf.html doesn't help. At least nothing jumps out Instead this is my starting place. http://linuxcnc.org/docs/html/man/man9/hostmot2.9.html#pwmgen Here's the hal file information for the stepper based spindle. I need the PWM allocated to DB25-14 (pin 1 on Mesa board) and the direction signal on DB25-16 (pin 5 on the message board) # Step Gen signals/setup The information needs to be replaced but the rest remains the same I believe. Here's what I think I need with PWM scale declared in the .ini file. # PWM Gen signals/setup setp hm2_7i92.0.pwmgen.05.scale [SPINDLE_9]PWM_SCALE setp hm2_7i92.0.pwmgen.05.output_type 1 net spindle-enable => hm2_7i92.0.pwmgen.00.enable net spindle-vel-cmd-rps => hm2_7i92.0.pwmgen.00.value net spindle-cw => hm2_7i92.0.gpio.005.out Am I missing anything? Specifically if the S3000 command is read in G-Code then that has to be scaled by PWM Scale to be what? As in what should PWM Scale be if the default PWM frequency is 20,000Hz. Should it be 6.666667 to scale 3000 RPM to 20,000Hz? Or do we want to scale 3000 RPM down to a percentage by multiplying by 0.0333333 Is it really that simple? Thanks John Here's the step gen spindle area. #******************* # SPINDLE S #******************* setp pid.s.Pgain [SPINDLE_9]P setp pid.s.Igain [SPINDLE_9]I setp pid.s.Dgain [SPINDLE_9]D setp pid.s.bias [SPINDLE_9]BIAS setp pid.s.FF0 [SPINDLE_9]FF0 setp pid.s.FF1 [SPINDLE_9]FF1 setp pid.s.FF2 [SPINDLE_9]FF2 setp pid.s.deadband [SPINDLE_9]DEADBAND setp pid.s.maxoutput [SPINDLE_9]MAX_OUTPUT setp pid.s.error-previous-target true setp pid.s.maxerror .0005 net spindle-index-enable <=> pid.s.index-enable net spindle-enable => pid.s.enable net spindle-vel-cmd-rpm => pid.s.command net spindle-vel-fb-rpm => pid.s.feedback net spindle-output <= pid.s.output # Step Gen signals/setup setp hm2_7i92.0.stepgen.05.dirsetup [SPINDLE_9]DIRSETUP setp hm2_7i92.0.stepgen.05.dirhold [SPINDLE_9]DIRHOLD setp hm2_7i92.0.stepgen.05.steplen [SPINDLE_9]STEPLEN setp hm2_7i92.0.stepgen.05.stepspace [SPINDLE_9]STEPSPACE setp hm2_7i92.0.stepgen.05.position-scale [SPINDLE_9]STEP_SCALE setp hm2_7i92.0.stepgen.05.step_type 0 setp hm2_7i92.0.stepgen.05.control-type 1 setp hm2_7i92.0.stepgen.05.maxaccel [SPINDLE_9]MAX_ACCELERATION setp hm2_7i92.0.stepgen.05.maxvel [SPINDLE_9]MAX_VELOCITY # connection to the physical port. net spindle-enable => hm2_7i92.0.stepgen.05.enable net spindle-vel-cmd-rps => hm2_7i92.0.stepgen.05.velocity-cmd net spindle-vel-fb-rps <= hm2_7i92.0.stepgen.05.velocity-fb # ---setup spindle control signals--- net spindle-vel-cmd-rps <= motion.spindle-speed-out-rps net spindle-vel-cmd-rps-abs <= motion.spindle-speed-out-rps-abs net spindle-vel-cmd-rpm <= motion.spindle-speed-out net spindle-vel-cmd-rpm-abs <= motion.spindle-speed-out-abs net spindle-enable <= motion.spindle-on net spindle-cw <= motion.spindle-forward net spindle-ccw <= motion.spindle-reverse net spindle-brake <= motion.spindle-brake net spindle-revs => motion.spindle-revs net spindle-at-speed => motion.spindle-at-speed net spindle-vel-fb-rps => motion.spindle-speed-in net spindle-index-enable <=> motion.spindle-index-enable # ---Setup spindle at speed signals--- sets spindle-at-speed true _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
