On Tuesday 05 May 2020 17:48:01 Dan Henderson wrote: > I have a PMDC motor I’ve scavenged along with the MC-2100 motor > control from a treadmill rated for 1.5 hp @ 90 volts. I’ve been > testing it with LinuxCNC v2.7.15 in a mock-up environment I built for > testing. I’m able to control the spindle speed via PWM pulses to the > controller (HD2 pin 4). M3 S500 will get me somewhere between 520 and > 580 rpm. You can hear the motor whine fluctuating with the RPM. I’ve > also installed a CUI ATM 10 encoder on the back and seem to have it > working with both an index and phase A signal. I have the jumpers on > it set to 200 PPR but it can go all the way to 2048. I’m using a cheap > china 5 axis BOB connected via parallel cable. > > Does anybody have any idea why I’m get so much flux on the rpm? Surely > this isn’t normal? I know enough about the HAL to be dangerous. Is > there some things I can check to smooth this out? Thanks. > If using a software encoder, as opposed to a mesa card, the time delay between samples at the 1 kilohertz servo loop can do odd things. Among others, the lag in the input opto-isolators of that bob can even cause missed pulses from the encoder to the software. Try a much lower speed to see if it stabilizes. If handy with a soldering iron, bypassing those opto's can help, a lot. > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users
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
