Richard Arthur wrote: > Issue: > The direction of searching for the index seems to be the inverse of the > direction of THE_HOME_LATCH VEL when I would have expected it to be the > same. > > What I did: > Update from (Ubuntu) 2.1.6 to 2.1.7. Generate new configs in my home > folder and modify to suit. > > However, with the current set up, homing is achieved successfully on > the index pulse as can be seen from the screen shot: > > http://imagebin.org/9711 > > ini snip: > > [AXIS_0] > > TYPE = LINEAR > HOME = 0.0 > MAX_VELOCITY = 4.0 > MAX_ACCELERATION = 20.0 > BACKLASH = 0.000 > INPUT_SCALE = 20000 > OUTPUT_SCALE = 1.000 > OUTPUT_OFFSET = 0.0 > MIN_LIMIT = -32.0 > MAX_LIMIT = 20.0 > FERROR = 0.01 > MIN_FERROR = 0.01 > HOME_OFFSET = 0.0 > HOME_SEARCH_VEL = 0.1 > HOME_LATCH_VEL = 0.04 > HOME_USE_INDEX = TRUE > HOME_IGNORE_LIMITS = YES > MAX_OUTPUT = 10 > > Thank you. > > Richard
Thanks for the halscope shot - that helps a lot! It looks like you are starting the homing process already on the switch. (Or maybe the home switch is active low and EMC only thinks it is on the switch.) Your search and latch velocities are both positive. But EMC starts the homing process moving in the negative direction - it thinks its on the switch and is trying to back off. At about 3.5 divisions on the scope trace it thinks it is off the switch and starts to move positive at search velocity. It almost almost immediately hits the switch, then backs off at a negative velocity. It begins the final pass at positive latch velocity just after 4 divisions on the scope trace. What physical direction corresponds to the initial negative slopw portion of the scope trace? Which end of the axis is your switch on? Is that initial move toward or away from the switch? If your switch is active low, you can invert the input by connecting to "m5i20.0.in-<whatever>-not" instead of "m5i20.0.in-<whatever>". Regards, John Kasunich ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
