Hi dave this the same on our Fanuc mills all with Yellow caps we have had a quick look into this, we will be looking into converter cards, seeing if they are upto the job can keep up with the rapids provide a smooth analog signal out at rapids and slow speeds also how well they compare to price on the cost of a good quality tacho brushed or brushless.
as you could just fit a tacho inplace of the encoder on top of the motor, feed this into the drive, reset the drive up and tune it for a tacho input. then fit the encoder out of the motor onto the screw & feed this into EMC for PID closed loop. when we refitted our leadwell which has mitsubishi motors and drives this was much same, this had resolvers and tacho (has brushles tacho tho which have never given a problem unlike brushed ones on our other machines) the tacho went into the machine control cards which i found was passed stright into the motor anyways. we fitted encoders direct onto the screw closed EMCs PID this way see here for some more info http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,30/id,559/lang,english/ good luck sounds like it will be good a intresting refit robert On 20/03/2010 22:03, Paul Keeton wrote: > As I stated earlier - > > The mill currently has encoders on the motors. The issue is getting > the Fanuc drives existing on the machine at this time to work with EMC. The > drive requires an analog reference command signal. The drive also requires > an analog tach signal to operate correctly. It does a comparison between > VREF and TSA (tach) to calculate both direction and speed and adjusts the > drive operation accordingly. To my knowledge and based on the documentation > on this drive and motor it must operate in velocity mode. The encoder > signal(A,A/,B,B/,Z,Z/) currently is fed to the Fanuc 11M control and is > converted in the main control hardware to an analog signal that is sent to > the drive. This model drive does not accept PWM signal for VREF or > Quadrature for the tach. If you take the Fanuc control out of the picture > and install an EMC based control the drive will still require the tach > signal. The machine does not have scales, It does not have tachs, it does > not have encoders. These items can be installed if/when needed > > Dave. > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
