Thank you for your suggestions, Peter. In this case Z assembly weights probably several hundred kilograms. And I don't have a big wish to remove the servo motor, although possible. Releasing the electromechanical brake makes it drop really fast.
By the way, I have never succeeded "setsing" or "setping" an encoder index-enable signal and waiting for it to go down by rotating the encoder by hand on other setups. I don't remember the exact behavior now. I thought it has something to do with less often used IO type of HAL pin.. But a bit of time passed, I should check that again. What is interesting, while not proven, that encoder count (or rawcount) persists between different LinuxCNC sessions and resets only after 7i77 5V power is re-applied. And exactly then I observe different Z position after homing. These things are not easy to prove, as they require big number of different tries. > I would hand check index detection by "setsing" the appropriate index-enable > signal and turning the axis by hand and watching for the same index-enable > signal to be cleared. If this does not work reliably it suggests you have a > encoder index signal interface problem of some sort (wrong interface mode, > too short index signal, missing index from resolver-digital converter, 5V > problem on 7I77, cable issues etc) > > The encoder errors also suggest some kind of generic interface issue > > Another diagnostic would be to halscope the index pulse itself assuming you > can move slowly enough to detect it in the servo thread, index pulses are > often 1 encoder pitch wide (1/2048 in your case) so you would have to move > more slowly than 2s seconds per turn to reliably detect it at a 1 KHz servo > thread > > > > Peter Wallace > Mesa Electronics > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
