HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/2
ttemple
User Rank
Platinum
Re: WHy not proper shielding?
ttemple   8/14/2012 1:34:23 PM
NO RATINGS
While it doesn't explicitly state it in the article, it appears that the encoders in question have single ended outputs.  It appears that the extenders convert the signals to differential mode, which is much more noise tolerant.  Shielding is a good idea, but with single ended signals I doubt it would have been enough if there is serious high frequency switching noise all around.

kf2qd
User Rank
Platinum
WHy not proper shielding?
kf2qd   8/14/2012 11:30:30 AM
NO RATINGS
Having built and serviced CNC plasma cutting machines, proper shielding of cables does wonders. The comercial products we used all had shielding built into the harness to keep the noise out. And the shields were always grounded at 1 end only., and in some cases where the design was older and more sensitive they actually had 2 shields, insulated from each other and each one grounded at opposite ends of the cable.

Also - effort should be made to seperate the motor and encoder cables. Often just having them shielded and a few inches apart is sufficient.

GlennA
User Rank
Gold
ground loop ?
GlennA   8/14/2012 11:07:31 AM
NO RATINGS
You mention using shielded cables.  Did you ground only one end of the cable shield ?  I have seen installations with both ends of the cable shield connected to ground, which makes ground loops a concern.

naperlou
User Rank
Blogger
Shorter signal path
naperlou   8/14/2012 9:02:24 AM
NO RATINGS
I was wondering, as I was reading the article, why you did not look at shortening the signal path.  I can think of reasons, but I am wondering what the situation is in this case.

<<  <  Page 2/2


Partner Zone
Latest Analysis
The highest paying bachelor's degrees -- both in starting salaries and mid-career incomes -- are mostly engineering and entirely STEM disciplines.
Wearable cameras possess the power to alter our work lives, the way industrial enterprises operate, and our personal lives because of the insights they can bring from their unobtrusive, first-person point of view.
Injection molding speedster Proto Labs is now offering magnesium molding as part of its rapid manufacturing services. Called thixomolding, the new service is aimed at both prototypes and low-volume production runs.
Combining ultra-lightweight materials with a monster 750-horsepower engine, engineers at Automobili Lamborghini have created one of the world’s fastest (and most expensive) new convertibles.
Design teams are improving efficiency and lowering costs by utilizing previous designs as a pre-validated foundation for next-generation goods.
More:Blogs|News
Design News Webinar Series
8/13/2015 11:00 a.m. California / 2:00 p.m. New York
6/25/2015 11:00 a.m. California / 2:00 p.m. New York
6/24/2015 11:00 a.m. California / 2:00 p.m. New York
6/11/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 31 - Sep4, Embedded System Design Techniques™ - Writing Portable and Robust Firmware in C
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service