I've seen Mazak do this pass through using the Mitsubishi drives and amps. It was a convenience wiring thing. The Mazak that we converted used Fanuc drives and did not have tachs on the motors. For that the encoder signals went to the control and it created a tach signal for the drives.
SteveS and a couple others worked up a drawing and material list to do that stand alone, but we decided to replace the drives with newer Servo Dynamics models. We ran these drives torque or current mode directly from EMC2 and the existing encoders. If you look at the Mazak config files you'll see some pretty wild tuning numbers that JohnK came up with. Rayh On Mon, 2009-11-02 at 09:27 +0000, robert wrote: > > > > Any guesses whether something was there? I had some trouble getting > > stable velocity loops, and it makes me wonder. > > > > > our Mitsubishi servo amps where the same, the tach went to a board which > then passed it onto the AMPs, tracing it through on the boards it was > just a pass through on the board connections, as same lead carried the > tacho and resolver signals. (we fitted encoders on the screws) > > so linking it straight into the drive on the tacho inputs worked perfect. > > with out it the AMPs never know if the motor is moving or not > or running at the correct speed to the commanded velocity signal so they > just stay in E-Stop state or alarm out. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
