Advantech ADAM-5550KW Series, Руководство пользователя

Страница: 269 / 287

Appendix B Grounding Reference
B-2 ADAM-5510KW Series User’s Manual
Field Grounding and Shielding Application
Overview
Unfortunately, it’s impossible to finish a system integration
task at one time. We always meet some trouble in the field. A
communication network or system isn’t stable, induced noise
or equipment is damaged or there are storms. However, the
most usual issue is just simply improper wiring, ie, grounding
and shielding. You know the 80/20 rule in our life: we spend
20% time for 80% work, but 80% time for the last 20% of the
work. So is it with system integration: we pay 20% for Wire /
Cable and 0% for Equipment. However, 80% of reliability
depends on Grounding and Shielding. In other words, we
need to invest more in that 20% and work on these two
issues to make a highly reliable system. This application note
brings you some concepts about field grounding and
shielding. These topics will be illustrated in the following
pages.
1. Grounding
1.1 The ‘Earth’ for reference
1.2 The ‘Frame Ground’ and ‘Grounding Bar’
1.3 Normal Mode and Common Mode
1.4 Wire impedance
1.5 Single Point Grounding
2. Shielding
2.1 Cable Shield
2.2 System Shielding
3. Noise Reduction Techniques
4. Check Point List