I've finally been able to circle back to this, thanks for the feedback. I do use pncconf and have the spindle display selected with encoder feedback, but it looks to me like the filtered and abs signals are from the encoder feedback input rather than the motion command output and so not suitable for driving the pwmgen. However, the same technique you've pointed out of inserting an abs component inline of the spindle-vel-cmd should work just fine. I hope to have some time this weekend to prove it out. Thanks much for that.
I've also noticed that the default with encoder feedback in pncconf is still open loop with a "spindle at speed" setting. This makes me curious how many people use a PID loop in their spindle feedback and if you do or don't why not. Thanks again, Scott On Sun, Nov 18, 2012 at 4:49 PM, Chris Morley <chrisinnana...@hotmail.com>wrote: > > > > My problem is that the drive controller has a direction input and a speed > > input and the speed input is 0 to +10V regardless of direction. My > > thinking was that I could just tie the direction pin feeding to the 7i33 > > high and wire a different I/O pin to the direction input of the drive and > > tie that pin to the spindle direction. > > > > Unfortunately, I can't figure out how to tie the direction pin feeding > the > > 7i33 to high. In the pncconf-generated configuration there is no > explicit > > configuration that I can see tying the spindle direction to the direction > > pin expected by the 7i33. > > > > Am I missing something obvious or is there a different way to accomplish > > what I want? > > > > Thanks! > > > > Scott > > The problem is linuxcnc does not have a pin that supplies absolute spindle > speed. > So you must run it through an absolute component and use the spindle cw > signal. > > Do you use the spindle display options in PNCconf? > If you do then depending if you use spindle feedback (encoder) or not > there will be > one of three signals available : > No feedback: absolute-spindle-vel ( this is in RPM) > encoder: spindle-fb-filtered-abs-rpm or spindle-fb-filtered-abs-rps > > The second two are filtered but I don't imagine that matters much. > You would have to mess with the scale of the PWM gen to match input signal > units and range. > > you would disconnect spindle-vel-cmd from the spindle PWM gen and connect > one of those signals to the PWM gen. > > Then you can use spindle cw signal (selected in the mesa page) to select > the direction > on an available output pin. > > I think that should work if I didn't confuse you or me :) > > Chris M > > > > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
