Thank you Peter for your quick response. I just checked my ini file and the entry is like this HOME_USE_INDEX = YES. I also have set SEARCH VEL and LATCH VEL at 10 and 5 respectively. I even inverter the differential pins on the Z pulse just to be sure they weren't backwards but the behaviour is the same. I'll keep playing with it but for now I can only set the index pulse to on manually.
The manual says the following: - *HOME_USE_INDEX = NO* - If the encoder used for this joint has an index pulse, and the motion card has provision for this signal you may set it to yes. When it is yes, it will affect the kind of home pattern used. Currently, you can’t home to index with steppers unless you’re using stepgen in velocity mode and PID. - Is it talking about using the step mode in velocity to drive the servo in velocity mode? Because I'm using it in velocity mode but just as suggested to close the loop internally and gain more accuracy at the output. Not closing the loop with the motor encoder. Anyway these servos I don't think can't take pulses as velocity command. I have the hardware to output +/- 10 volts but I rather use them as step and direction to avoid mounting encoders on the screws. I don't think using the encoder on the motor to be the best idea because the motor is coupled to the ballscrew by means of a toothed belt. El vie., 10 abr. 2020 a las 16:31, Peter C. Wallace (<p...@mesanet.com>) escribió: > On Fri, 10 Apr 2020, Leonardo Marsaglia wrote: > > > Date: Fri, 10 Apr 2020 16:11:18 -0300 > > From: Leonardo Marsaglia <ldmarsag...@gmail.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net > > > > Subject: [Emc-users] Home use index problem (In step + dir mode) > > > > Hello guys again, > > > > I'm testing the homing of the X axis with a push button and that works > > except when the index pulse has to trigger. That never happens. > > > > I'm using the 7i52S to move my servo with step + dir for position command > > right to the drive. In LCNC the stepper is working in velocity mode like > > it's recommended. I'm reading the Z pulse of the servo motor thru the > same > > 7i52S using one of the encoder inputs. I'm only reading Z because I don't > > need A and B for my purposes now. > > > > The problem is, I can't make the homing with index feature to work. I can > > see the index pulse triggering to FALSE when the shaft completes the > turn, > > and I even set the pin to TRUE again manually to see if the homing > sequence > > stops, but the motor keeps turning at final velocity waiting for the > index > > to happen. > > > > I'm even monitoring the joint.0.index-enable pin with Halmeter to be sure > > the signal is linked and it's working ok. The only thing I find strange > is > > that I need to set the index-enable pin to TRUE by myself. The homing > > sequence doesn't seem to be doing that. > > It sounds like you dont have homing to index enabled in your ini file > (if motion does not set index-enable, it will not look for it going false) > > That said I dont think this will work correctly on step/dir systems > without > encoder feedback. The reason is that on index detection, the reported > position > on encoders is zeroed, (and motion expects this behavior) this is not done > on > stepgens. The hardware for capturing the index and the stepgen count at > index is in the firmware, (allowing stepgens to emulate encoder behaviour) > but the hm2 driver has no support for this option. > > > > > > > I'm using LCNC 2.8.0-pre1-5538-g21d7db0. I was thingking maybe this > > feature is not allowed with steppers and that's why I can't use it? But > the > > homing sequence is actually waiting for that index pulse so I don't think > > this is the case. > > > > I'm surely missing something here, but without your help I'm a little bit > > lost. > > > > As always thank you for your support! > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
