Advantech RS-485 user manual ADAM-5000

Grounding Reference

Field Grounding and Shielding Application

Overview

Unfortunately, it’s impossible to finish the system integration task at a time. We always meet some troubles in field. Such as communication network or system isn’t stable, noise influence, and equipment is damaged or hungs up by thunders. However, the most possible issue is just the improper wiring; ie, grounding and shieldinF. As you know the 80/20 rule in our life: we spend 20% time for 80% works, but 80% time for left 20% works. So to system integration, we paid 20% cost for Wire / Cable and 80% cost for Equipment. However, 80% reliability depends on Grounding and ShieldinF. In a word, we just need to pay 20% investment and work on those two issues to get a high reliable system.

This application note will bring you some concepts about field grounding and shieldinF. Below topics will be illustrated in following pages.

1.Grounding

1.1The ‘Earth’ for reference

1.2The ‘Frame Ground’ and ‘Grounding Bar’

1.3Normal Mode and Common Mode

1.4Wire impedance

1.5Single Point Grounding

2.Shielding

2.1Cable Shield

2.2System Shielding

F-2 ADAM-5000