Introduction To Emc - Siemens SINAMICS S120 Equipment Manual

4.3

Introduction to EMC

Description
Electromagnetic compatibility (EMC) describes the capability of an electrical device to
function satisfactorily in an electromagnetic environment without itself causing interference
that is unacceptable for other devices in the environment.
EMC therefore represents a quality feature for:
● Internal noise immunity: resistance to internal electrical disturbances
● External noise immunity: resistance to external electromagnetic disturbances
● Noise emission level: environmental effects caused by electromagnetic emissions
For fault-free operation of the cabinet in the plant, environmental interference must be taken
into consideration. Therefore, special demands are placed on the plant configuration with
respect to EMC.
Operational reliability and noise immunity
In order to achieve the greatest possible operational reliability and immunity to noise of an
entire system (converter, automation, drive machine, etc.), measures must be taken by the
converter manufacturer and the user. Only when all these measures are fulfilled can the
faultless functioning of the converter be guaranteed and the specified legal requirements
(2004/108/EC) be met.
Noise emissions
Product standard EN 61800–3 outlines the EMC requirements for variable-speed drive
systems. It specifies requirements for converters with operating voltages of less than 1000 V.
Different environments and categories are defined depending on where the drive system is
installed.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
Electrical installation
4.3 Introduction to EMC
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