Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 33)

Publication GMC-RM001A-EN-P — July 2001
Chapter
3
Segregating Sources and Victims
Chapter Objectives This chapter describes how establishing zones within your panel for
noise sensitive or noise generating components can reduce coupling
of electrical noise. This chapter covers the following topics:
• Understanding the segregation concept
• Zone classification
• Routing wires and cables within a panel
• Routing system wires and cables between panels
Understanding the
Segregation Concept You can avoid many of the problems caused by noise by grouping
sources and victims (along with their associated wiring) in zones
according to their noise performance rather than arranging for
neatness, tradition, or convenience.
Noise Zones
The three noise zones are defined in the table below.
This descriptive terminology (very-dirty, dirty, and clean) is chosen for
maximum clarity. Most noise documents assign numbers to the zones,
but there is no consistent numbering scheme. The descriptive
approach allows you to see the true meaning of a zone at a glance,
without having to remember a code.
This noise zone: Has this relative noise level:
Very-Dirty High
Dirty Moderate
Clean Low