> Can you run those drives in velocity mode? > I think that would be a lot easier to tune. > I would avoid torque mode if possible. Life will be easier. > > Dave
Yes velocity mode is a singel integral process while torque mode is a double integral process to position. Velocity mode will work better. A velocity loop nested inside the position loop will also work but with slower dynamic response. Did you read control theory? Use the automatic tuning functionality within linuxcnc? Regards Nicklas Karlsson > > > On 4/6/2016 4:53 AM, Marshland Engineering wrote: > > I finally have my mill table moving under CNC control. > > > > I'm using a 70 volt supply with DCM D6 drives in Torque mode, Mesa 7i48 > > cards, > > Linear scales for position and 1.2 kw DC brush motors (my guess on the power > > as they are 90 volt motors but no current rating) > > > > The only way I can get any control over the travel is setting P = 0.5 which > > of > > course makes the position accuracy poor. Any more P and I get sever > > oscillation. With the size of motor and the 1m table, there is quite a lot > > of > > inertia in the system. > > > > Anyone suggest starting values or any other suggestions to get this under > > control. > > > > Thanks Wallace. > > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > 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 ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
