On Wed, 2009-04-01 at 22:18 -0700, Dave Engvall wrote: ... snip > Indeed that ( + and - ) would be the intuitive way to do it but it > doesn't work. > > I tried changing the sign on INPUT SCALE and the sign on OUTPUT_SCALE > independently but that doesn't work either. Axis moves on command and > then > faults on following error. > So I have more work to do. > > Dave
I briefly looked over the Servo Dynamics ( www.servodynamics.com ) 1525-BR manual ( http://www.servodynamics.com/Manuals/1525br_manual.pdf ). They do seem to indicate that the + input is a single ended common, but don't explain why. It would be nice to see what chip or circuit they use for the input. If you can take the cover off without voiding your warranty, can you get a close up picture of the input area on both sides of the board? Another thing that came to mind is that the enable input is pulled high or active by default, so it seems that if the enable signal fails, most likely the amp will be active. It looks like the position limit switch inputs are the same way, they seem to fail with the amp active. The manual indicates the amp has inputs for torque and velocity feedback, which may complicate things. The amp output to the motor will vary with, the input from EMC2, and the feedback to the amp from the motor. I like to have EMC2 handle all of the feedback, but looks like the torque mode feedback really is a current limit to protect the motor, so this should be the setup to use. What are you using as the analog output to the amp? Now that you have some motion working, if you set the FERROR and MIN_FERROR, for the axis under test, to a large number, such as 1", does the encoder display in AXIS match the the commanded motion? In other words, for a command for a .5" plus movement at a slow feed rate , increase the displayed position by .5"? --------- Kirk http://www.wallacecompany.com/machine_shop/ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
