Electrical installation
4.4 Introduction to EMC
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
49
Introduction to EMC
What is meant by EMC?
Electromagnetic compatibility (EMC) describes the capability of an electrical device to
function satisfactorily in an electromagnetic environment without itself causing interference
unacceptable for other devices in the environment.
EMC therefore represents a quality feature for the
● Internal noise immunity: Resistance to internal electrical disturbances
● External noise immunity: resistance against external electromagnetic disturbances
● Noise emission level: environmental effects caused by electromagnetic emissions
To ensure that the cabinet unit functions satisfactorily in the system, the environment subject
to interference must not be neglected. For this reason, special requirements exist regarding
the structure and the EMC of the system.
Operational reliability and noise immunity
In order to achieve the greatest possible operational reliability and immunity to noise of a
complete system (converter, automation, drive machines 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.
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