Chris Radek wrote: > On Thu, Jul 05, 2007 at 11:36:40AM -0500, Stuart Stevenson wrote: > >>Gentlemen, >> The screenshots are on imagebin.org under stustev. They are >>representative of the previously presented scenario of homing >>attempts. aligned, .030, and .060. >>thanks >>Stuart > > > It looks to me that you are getting more index pulses than you > should. At first glance I don't think this is a problem with the > new homing method. > Form the one posted picture, that isn't clear. He has a home position with an offset from the index pulse. That is that final, fast ramp on the position. > If you have the latest ppmc firmware chip (?), I'm pretty sure > the ppmc is working right from seeing Jon's device at Workshop. > In that case, maybe you should get out the (real) scope and check > for noise on your encoder lines right at the ppmc inputs. That is good advice, but a posted screenshot with the ppmc.0.encoder.0x.index pin displayed would be helpful. It could be extra index pulses, and they should show up in halscope, too, if present. But, I suspect something else is going on. You might try backing off an inch or so and homing a couple of times. If that IS repeatable, then something about starting a home sequence VERY close to the home position may be the clue. Also, if you can try having the HOME_LATCH_VELOCITY the same polarity as HOME_SEARCH_VELOCITY, and see if that makes a difference. The more we can narrow down what the conditions are that cause the problem, the more it steers us to the source of the trouble.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
