On Tuesday 05 May 2020 20:17:45 Dan Henderson wrote: > Slowing things down had marginal effect. Okay sounds like I need to by > pass the optocouplers. Would you recommend I bypass all the encoder > inputs as well as the PWM output to the MC2100 controller?
Only if it has opto's for isolation, they can effect to duration of the pwm playing hob with the speed linearity. If the motor is "hunting", something else is going on. The m2100 ISTR is the controller that came in the treadmill and its a very serious case of built by lowest bidder, I was not able to use it in anything I've tried. Control was extremely non-linear until I put a 47k resistor between linuxcnc and its summing point, That helped but it was still flaky. Not to mention that all of its control circuitry is on the hot side of the power line and quite dangerous. I am not a machinist, but a long retired broadcast engineer and a CET so much of the high power stuff comes out of my junk box. The psu for instance, makes about 120 volts DC at a surge current of 20 amps, 10 forever, way more that the 1hp motor I'd put on the back of a 7x12 lathe is rated for. Capable of getting 2hp out of that 90 volt motor. But it kept breaking drive parts once I had obtained one of the pico systems pwm-servo drivers. So I've gone into the hal file and slowed the motors acceleration to something that doesn't break stuff any more. But that might explain why my troubleshooting is geared to the electronics, and possibly is different than what a real machinist might do to solve an identical problem. Other than that it doesn't sound as if the opto's speed is your problem. So 2 other questions: What to you have in the way of meters and oscilloscopes for troubleshooting? Do you actually have LinuxCNC running well enough to try to control your motor? Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
