Siemens A1 User Manual
International English
Electromagnetic Compatibility
MICROMASTER Applications Handbook
33
6.3
EMC Rules and Regulations
The regulations concerning EMC are complex, changing and vary from country to
country. The most important point to remember is that if there is no problem there
is unlikely to be a legal issue, and in any case prevention is better - and cheaper -
than cure.
country. The most important point to remember is that if there is no problem there
is unlikely to be a legal issue, and in any case prevention is better - and cheaper -
than cure.
6.3.1 European
Regulations
The rules in Europe are complex, because they depend on the type of product,
how it is sold, and who installs it.
how it is sold, and who installs it.
Legislation, which came into force 1
st
January 1996, was designed to control
emissions and immunity of many types of electrical and electronic equipment for
both domestic and industrial applications. This is the EMC directive EEC/89/336,
which refers to many Euronorms (such as EN55011, EN55022 etc.) to set the
required levels.
both domestic and industrial applications. This is the EMC directive EEC/89/336,
which refers to many Euronorms (such as EN55011, EN55022 etc.) to set the
required levels.
However, separate EMC Product standard - EN 61800-3 has now been introduced
which overrules these standards for drives products. This is also a complex
regulation, but it does define two ‘environments’ - basically Domestic and
Industrial, and two distribution methods - Restricted and Unrestricted. Restricted
distribution means that the product is sold to a customer with some EMC
competence. For Restricted distribution and Industrial installations there are
essentially no limits on emission levels. For Domestic installations Class A1 or B1
levels apply, for Restricted and Unrestricted distribution respectively.
which overrules these standards for drives products. This is also a complex
regulation, but it does define two ‘environments’ - basically Domestic and
Industrial, and two distribution methods - Restricted and Unrestricted. Restricted
distribution means that the product is sold to a customer with some EMC
competence. For Restricted distribution and Industrial installations there are
essentially no limits on emission levels. For Domestic installations Class A1 or B1
levels apply, for Restricted and Unrestricted distribution respectively.
As the MICROMASTER is sold via restricted distribution for industrial applications,
no limits for emissions apply. However, customers may require the
MICROMASTER, or the final installation or equipment to meet other specifications
such as the EMC directive. In practice the majority of low voltage
MICROMASTERs are sold in Europe with a built in filter because of this.
no limits for emissions apply. However, customers may require the
MICROMASTER, or the final installation or equipment to meet other specifications
such as the EMC directive. In practice the majority of low voltage
MICROMASTERs are sold in Europe with a built in filter because of this.