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SMA7130, SMA71075 and SMA71100 MANUAL
Electromagnetic Compatibility Guidelines
For Machine Design
This document provides background information about Electromagnetic Interference (EMI) and
machine design guidelines for Electromagnetic Compatibility (EMC)
Introduction
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, these 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. A device 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.
Figure 1 - EMI Source-Victim Model
EMI
SOURCE
EMI
VICTIM
EMI
VICTIM
Conducted EMI
Radiated
EMI
APPENDIX C: EUROPEAN UNION EMC DIRECTIVE
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