Though it appears obvious that you aren't having this problem, since on a lot of discussions on PID timing, people seem to overlook this, I just want to mention this for the one guy listening who might be bitten by this otherwise.
When you take a servo motor off a machine, you unload a lot of torque load from the motor because it doesn't need to drive the table or whatever. This new configuration for the motor requires drastically different PID values than it does on the machine, and the usual result will be a motor that oscillates madly with the original PID values. That can harm the motor or the controller. On 01/29/2011 02:52 PM, emc-users-requ...@lists.sourceforge.net wrote: > I am working on getting 4th axis to work. While it does move as commanded, > it does so in a visibly jerky way. > > At first I thought that it was mechanical issue inside the rotary table, > such as rust, poor gear meshing, eccentricity etc. > > I took off the motor and even the lovejoy coupling. The motor, with the > attached resolver etc, is now completely alone, lying on a foam pad on the > floor. > > The way this system works is that the motor has a little tiny toothed belt > going to the resolver, wires from resolver go into "Resolver to Quadrature > Encoder Converter", and from there into PPMC as an input. > > The bad news is that even without anything on the shaft, it still moves in a > jerky way. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
