Hello again, well, these are the facts, my associate is decided and has already bought the Weg CFW-07 and 08 frequency changers, so there is no turn back now.
Is there any sample using this kind of system? any help please. El 13/02/2009 02:39 p.m., Peter C. Wallace escribió: > On Fri, 13 Feb 2009, Richard Acosta wrote: > >> Date: Fri, 13 Feb 2009 02:11:16 -0200 >> From: Richard Acosta <eyela...@gmail.com> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> Subject: [Emc-users] 7i43 and partial success!. >> >> Hello, it´s me again, this time to tell i'm the happy owner of a very >> sophisticated 3 axis measurement machine... >> Well, i could finally make my encoders to communicate with EMC and my >> 7i43, wasn't too har, only some few silly things that should have been >> working from the beginning. >> I have to thank again to everyone who has helped me and gived me their >> patience. (i hope my english is better than i think) >> >> I have used pins quad-a, quad-b and a "pair" pin to connect to the >> encoders pins a- b- and "earth" (ground i guess) and, so far everithing >> is working flawlesly. I move the encoder, and the data moves on both >> encoder's display and EMC pc's screen. >> 1) Should i use any other pin for any other function? since there are >> some other on encoder's plug (DB9). 0V, a+,b+,r+,r- and 5v >> 2) Where to connect Quad-IDX or not? > > That should connect to r- if you want quadrature index inputs > >> >> Ok, now... this is the time to connect the motors, i'm not going to use >> stepper motors, but i'm going to use servos. >> I'm about to connect 3 freq. converters to use 3 triphasic AC motors. >> The ones i'm planning to use are CFW-07 and CFW-08 from Weg. > > AFAIK 3 phase induction motors do not make good position control servo > motors They are fine for spindle use and very low performance servos. > > I'm no expert here but when we tried using a 3 phase induction motor > as a servo, the problem was the lag in rotor current, especially in > reversals. > > >> 3) Is there something i have to take in consideration before to do it?, >> i'm going on the correct path? > > Induction motors & VFDs (the the WEG CFW series are VFDs - Variable > Frequency Drives) are not a good choice as a servo system. you want a > real servo amp/motor setup > >> I have seen on the .bit file there are some pins marked as "PWM", "dir" >> and "/enable" >> 4) are those the freq. converter's "start/stop", "direction" and >> "general enable" pins? > > No > >> >> The Freq. converters have an rs232 interfase. >> 5) Is there any way to use the 232 interfase with 7i43 and EMC2? >> > > > No > >> As you can see, i don't know much about motors, servos and so. >> >> Thanks in advance. >> ------------------------------------------------------------------------------ >> >> >> Open Source Business Conference (OSBC), March 24-25, 2009, San >> Francisco, CA >> -OSBC tackles the biggest issue in open source: Open Sourcing the >> Enterprise >> -Strategies to boost innovation and cut costs with open source >> participation >> -Receive a $600 discount off the registration fee with the source >> code: SFAD >> http://p.sf.net/sfu/XcvMzF8H >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise > -Strategies to boost innovation and cut costs with open source participation > -Receive a $600 discount off the registration fee with the source code: SFAD > http://p.sf.net/sfu/XcvMzF8H > ------------------------------------------------------------------------ > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
