I agree, but what I saw was not PID oscillations. This only occurred during moves.
I do think very strongly that I see some deficiency in resolver output. i On Sat, Jan 29, 2011 at 2:42 PM, cogoman <[email protected]> wrote: > 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, [email protected] 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
