Ultra Start 450 SERIES Manuel d'installation télécharger pdf (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.

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Ultra Start 450 SERIES Manuel d'installation Page 274