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
Pico Interactive is developing a stand-alone system, the Pico Neo, that it hopes will transform virtual reality into a more mobile and accessible experience.
A survey by Arena Solutions finds that half of all product companies do not use PLM. They manage their parts using Excel or nothing.
Modular approach simplifies assembly of demand-based, custom-configurable valve systems.
Wearable electronics may soon have another alternative to cumbersome batteries for power with the development of a new ultra-thin solar cell flexible enough to wrap around a pencil.
DIY candy, journeys to Mars, coding for road trips, and more. These STEM (science, technology, engineering, and math) activity options will keep kids engaged this summer, from 10-minute activities to more advanced undertakings.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 11 - 15, Embedded System Design Techniques™ - Debugging Real-time Embedded Software – Hands on
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


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

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service