English | 8. SUPPLEMENTARY INFORMATION |
8.3 Electro-Magnetic Compatibility (EMC)
All manufacturers / assemblers of electrical apparatus which performs a complete intrinsic function which is placed on the market as a single unit intended for the end user must comply with the EMC directive EEC/89/336 after January 1996. There are three routes by which the manufacturer/assembler can demonstrate compliance:
1.Self-Certification
This is a manufacturer’s declaration that the European standards applicable to the electrical environment for which the apparatus is intended have been met. Only standards which have been officially published in the Official Journal of the European Community can be cited in the manufacturer’s declaration.
2.Technical Construction File
A technical construction file can be prepared for the apparatus describing its EMC characteristics. This file must be approved by a ‘Competent Body’ appointed by the appropriate European government organisation. This approach allows the use of standards which are still in preparation.
3.EC Type-Examination Certificate
This approach is only applicable to radio communication transmitting apparatus.
The MICROMASTER units do not have an intrinsic function until connected with other components (e.g. a motor). Therefore, the basic units are not allowed to be CE marked for compliance with the EMC directive. However, full details are provided below of the EMC performance characteristics of the products when they are installed in accordance with the wiring recommendations in section 2.1.
Three classes of EMC performance are available as detailed below. Note that these levels of performance are only achieved when using the default switching frequency (or less) and a maximum motor cable length of 25 m.
Class 1: General Industrial
Compliance with the EMC Product Standard for Power Drive Systems EN
EMC Phenomenon
Emissions:
Radiated Emissions
Conducted Emissions
Immunity:
Electrostatic Discharge
Burst Interference
Radio Frequency Electromagnetic Field
Standard
EN 55011
EN
EN
EN
IEC
Level
Level A1 *
*
8 kV air discharge
2 kV power cables, 1 kV control
* Limits not required inside a plant where no other consumers are connected to the same electricity supply transformer.
© Siemens plc 1997 | |
26/09/97 | 38 |
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