On Tue, 14 Sep 2010, Kai Schaeffer wrote:
Date: Tue, 14 Sep 2010 14:20:21 +0200
From: Kai Schaeffer <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] Beginner question about cable lengths
Hi everyone,
We are planing a spray system on a X-Y-table and want to control it with
EMC. We want to use servo motors. When I see it right a common setup is
to use for instance a Mesa 5i20 board and a 7i30 H-bridge. My question
is now: what cable lengths are possible. I guess the H-bridge should be
close to the I/O card i.e. PC. So I have a long cable between the
H-bridge and the motors. What lengths are possible there?
A more common set of cards is a 5I20 and a 7I33TA analog servo interface, to
be used with analog servo drives. The 7I30 is a very small HBridge, only
suitable for small tabletop mills if that
Just a thought I had: wouldn't it be a good idea to bring the H-bridge
close to the motors? Then you need a different link between the I/O card
and H-bridge. The 7i43 supports the USB port, but there I see some
problems with the realtime, right? But what about the 5i21 I/O with a
8i20 card and a serial RS-422 link between them? I know, it's not
support at the moment, but is it possible in general? Or is there
something I miss?
There should not be much trouble with long encoder or motor leads as long as
you use differential encoders and shielded wire. The motor wires
should be shielded as well (with their own shield)
The 8I20 is not supported by EMC yet but theres is a possibility of support
soon. The 5I21 could be used but probably a simpler solution as far as wiring
goes is to use a 5I20 or 5I23 (5I23 preferred) and a 7I44 RS-422 daughtercard,
as this daughtercard uses the same cables (standard Ethernet Cat5) and pinout
as the 8I20 for the serial link.
Regards,
Kai
--
Schaeffer AG
Dipl.-Phys. Kai Schaeffer Vorstand
Nahmitzer Damm 32 Tel. +49-30-8058695-25
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Vorstand: Jörg Schaeffer, Kai Schaeffer
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Peter Wallace
Mesa Electronics
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