On Wed, 17 Aug 2011, Jon Elson wrote: > Date: Wed, 17 Aug 2011 22:53:58 -0500 > From: Jon Elson <el...@pico-systems.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Mesa 5i23/7i33TA servo instability question > > Scott Hasse wrote: >> OK, so this has turned into a more interesting problem than I initially >> thought it would be. I've used halmeter to verify that, for instance, >> pin pid.x.enable is indeed getting enabled when the machine gets to the on >> state. Additionally, the pid.x.output becomes non-zero after the machine is >> turned to the on state, so I believe EMC2 for some reason thinks the motor >> needs to move. >> >> > With the servo amps disabled, and EMC in the machine on state, move the > encoders manually > and observe the output of the DAC with a voltmeter. Does it swing back > and forth in voltage
Thats a good idea. You can also verify that the feedback is correct at this stage by checking that voltage swings in such a direction so as to drive the motor in the opposite direction of the encoder movement (the desired negative feedback) <----------------------------SNIP---------------------------> > > Jon > Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
