Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 274)

Publication 1398-5.2 – PDF 1997
Appendix E
Electromagnetic Compatibility
Guidelines for Machine Design
Appendix E
This appendix provides background information about
Electromagnetic Interference (EMI) and machine design guidelines
for Electromagnetic Compatibility (EMC). Installation requirements
for compliance to the European Electromagnetic Compatibility
Directive are specified in “European Union Requirements” on page 3-
9. AC Line Filters necessary for European EMC compliance are listed
in “AC Line Filters” on page 5-8.
Perhaps no other subject related to the installation of industrial
electronic equipment is so misunderstood as electrical noise. The
subject is complex and the theory easily fills a book. This section
provides guidelines that can minimize noise problems.
The majority of installations do not exhibit noise problems. However,
the filtering and shielding guidelines are provided as counter
measures. The grounding guidelines provided below are simply good
grounding practices. They should be followed in all installations.
Electrical noise has two characteristics: the generation or emission of
electromagnetic interference (EMI), and response or immunity to
EMI. The degree to which a device does not emit EMI, and is immune
to EMI is called the device’s Electromagnetic Compatibility (EMC).
Equipment which is to be brought into the European Union legally
requires a specific level of EMC. Since this applies when the
equipment is brought into use, it is of considerable importance that a
drive system, as a component of a machine, be correctly installed.
“EMI Source-Victim Model” shows the commonly used EMI model.
The model consists of an EMI source, a coupling mechanism and an
EMI victim. Devices such as servo drives and computers, which
contain switching power supplies and microprocessors, are EMI
sources. The mechanisms for the coupling of energy between the
source and victim are conduction and radiation. Victim equipment can
be any electromagnetic device that is adversely affected by the EMI
coupled to it.