I have only lightly been following this thread. I have some experience converting a large hmc and initially not knowing how to hook up the +/-10 volt signals from the mesa hardware. Initially testing I sure hooked it up wrong. The servos would spit and sputter when outputting a constant voltage (say 1v from the mesa card). I ended up looking at the wiring examples from A-M-C drives site to get some ideas. IIRC - it ended up being that I didn't carry the ground from mesa to the amc drives. (I figured it was a differential input to the amc drives so I didn't think I needed to carry a signal ground. (I guess I did)
I was having an on-going issue with the spindle drive - You could hear it dropping out every once in a while. It got worse and finally figured out I common grounded the HV ground with the signal ground. Once I separated that - no issues since. I really hate analog signals..... Always have. :) But I kept plugging away and asked tons and read a lot. sam On 10/09/2011 01:08 AM, Bruce Klawiter wrote: > > Jon Elson<elson@...> writes: > >> Yeah, actually, I'd like to see one of these spikes zoomed in on the >> time scale so it is > See image 9 here: https://sites.google.com/site/bmklawt/home/pid-tuning > >> Bruce says he has run it back >> and forth for >> a half hour, and it was within one encoder count of proper position >> (.0005") It seems VERY >> unlikely it could do that without errors accumulating. > I am not following this, why can't it do this without errors accumulating. > >> I think Bruce has an oscilloscope, > I do not have one, wouldn't have a clue how to use it if I did. > > I unhooked the Y and Z axis amps and only had the X axis plugged into the DAC > board and when running the X axis it still had random jerks. > > Here are two videos of the jitter I get in the Z and Y axis. > The > first one showing the Z axis jitter when the X axis is moving back and > forth. > The knob is on the end of the servo motor. > http://www.youtube.com/watch?v=7wZQwee8bec > > The second one is of the Y axis while the X axis is homing, as soon as the X > axis stop so does the Y jitter > http://www.youtube.com/watch?v=O66oefYwhp0 > ------------------------------------------------------------------------------ > All of the data generated in your IT infrastructure is seriously valuable. > Why? It contains a definitive record of application performance, security > threats, fraudulent activity, and more. Splunk takes this data and makes > sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-d2dcopy2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
