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.
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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
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