> -----Original Message-----
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: March-03-21 6:40 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Following Error Joint 2
>
> On Wednesday 03 March 2021 20:18:44 Gene Heskett wrote:
>
> > On Wednesday 03 March 2021 19:42:25 John Dammeyer wrote:
> > > I made another video with the new 3D printed pulley. Much better
> > > balanced as I made the inner hole and outside hub thicker and then
> > > bored and turned it to the correct diameter and concentric with each
> > > What I don't understand is why extra weight made it show up. The AC
> > > Servo Drive is not showing an error and motor current rarely goes
> > > above 3.5A at 220VAC or about 770W.
> >
> > Put the halscope on it, trigger on the home switch, and watch the
> > control, fb, and error sigs.
> >
> > Adjust FF1 for zero error while its cruising, I think it will be
> > higher than 1.0 Small amounts of FF2 and gain should be investigated.
> >
> That should have said "Dgain".
The Following Error shows up a long way from the home switch. It's the
PageDown key for moving the Knee closer to the spindle that does it. And
flipping between the up/down keys with short knee movements with the 120 lbs on
the table caused the issues.
Recall this is open loop motion with no feedback from the servo other than if
the servo faults which it doesn't. So weight shouldn't matter. Should it? I
removed the fault output from the servo drive so it can't fault the system.
The comment on the link about Ethernet latency is what interested me. Again if
electrical noise causes retries or delays in the Ethernet signalling then that
could cause this sort of error under heavy load.
John
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