On Thu, 8 Jul 2021 at 23:19, John Dammeyer <jo...@autoartisans.com> wrote:
> When I click the '-' with the RPM at 501 it drops to 401. Again and so on > down to 101. The last click should take it down to 1 or 0 RPM. However that > last click sends it to max speed of 3000 RPM. This happens when the PID goes negative. Imagine that the PID output is 0, but the speed is still positive, so the PID reduces the output to -10. This becomes an absolute speed ot 10, which is still too high, so the PID goes down to -100.... The best way round this is probably to pass the pid output through an abs block (I think that you do that) but then control the spindle direction using the abs.0.is-positive / is-negative outputs rather than the spindle direction pins. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
