Electromagnetic Compatibility for the control and power distribution systems of machinery and equipment
- Author: Hartmut Lohrey
Electromagnetic compatibility is tremendously relevant as one aspect of the trouble-free operation of the electrical equipment of machinery, production plants and energy distribution
systems. As well as the task of safeguarding the electrical control technology and power distribution from environmental influences and protecting users from the dangers of electric current, enclosures also make a significant contribution to undisturbed operation thanks to the shielding effect of their metallic housings and potential equalisation measures.
In most industrial enclosure applications, EMC can be achieved by adhering to a few fundamental principles during assembly and installation and with the shielding effect that is normally already present in metal enclosures. The use of frequency converters does not represent a different situation. However, special sensitivity is desirable in relation to the requirements if there are any indications of strong fields of interference at the installation site, for example from spark erosion machines, high-frequency welding systems, or from the application itself, for instance radar or satellite communication, etc. In such cases, an RF-shielded enclosure must be urgently planned as an additional EMC measure. Optimisation of the EMC is only possible with a combination of every possible measure and aid such as a choice of enclosure, installation rules as well as filters and surge protection. In such cases, an EMC analysis of the planned application is crucial.
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