----- Original Message ----- > From: "andy pugh" <bodge...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Tuesday, June 20, 2017 4:27:46 AM > Subject: Re: [Emc-users] following error only while homing > > On 20 June 2017 at 03:51, <tom-...@bgp.nu> wrote: > > > Why would I get a following error only while homing > > > I think it is probably because you are using HOME_USE_INDEX (which > will > zero the encoder at the index pulse) and feeding the encoder feedback > back > into LinuxCNC. > > Now, this is perfectly normal, and with a servo / pid machine the > system > knows to ignore the f-error immediately after an encoder reset. What > is > puzzling me here is why it isn't working in this case. I think it is > something to do with the fact that your system is set up for > open-loop step > position control but has encoder feedback. However I can't > immediately see > why this makes a difference. > > I imagine that if you press the home button again it will home Z > seamlessly, and then f-error homing the next axis. > > > -- > atp
Andy, I wish that were true. For some reason my analog servo machine trips up and sets a following error on an axis about 25% of the time when trying to home to index for the first time after turning on LInuxcnc. (Almost every time since it is a 4 axis machine.) But the alarm is easily cleared, and it always homes fine the 2nd try. I have never been able to figure out why, and no one else seems to have been able to replicate the problem. His problem sounds different since he says can't clear the alarm. My other machine with step/dir servos, doesn't have encoder index to home to. But it does home fine without ever setting following errors. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
