Line Filters For The "First" Environment (Residential) And "Second" Environment (Industrial) - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information
EN 55011
Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics -
Limits and methods of measurement
Before the EMC product standard was introduced, variable-speed electrical drives were covered by the scope of
standard EN 55011 which defines limit values for the interference emissions of industrial, scientific and medical radio-
frequency equipment. EN 55011 defines two classes of limit value:
•
Class A:
Equipment in class A is suitable for use in all locations except residential areas and other areas connected
directly to a low-voltage distribution system which (also) supplies residential buildings. Equipment in class A
must remain within the limits defined for class A.
Class A therefore corresponds to the "second" environment defined by EN 61800-3.
•
Class B:
Equipment in class B is suitable for use in residential areas and other areas connected directly to a low-
voltage distribution system which (also) supplies residential buildings. Equipment in class B must remain
within the limits defined for class B.
Class B therefore corresponds to the "first" environment defined by EN 61800-3.
These classifications are therefore used to define the limit values for conducted interference emissions,
corresponding exactly to categories C1 to C3 as defined in EN 61800-3.
•
Class B1:
This class corresponds to category C1 of EN 61800-3
•
Class A1:
This class corresponds to category C2 of EN 61800-3
Class A2:
This class corresponds to category C3 of EN 61800-3

Line filters for the "first" environment (residential) and "second" environment (industrial)

Line filters or RFI suppression filters limit the high-frequency harmonic effects on the supply systems of the drive by
reducing the conducted emissions in the frequency range between 150 kHz and 30 MHz. They ensure that the
disturbances produced by the variable-speed drive are mainly kept inside the drive system itself and that only a small
percentage (within the permissible tolerance range) can spread into the supply system.
The following diagram shows a variable-speed drive system which comprises a cabinet-mounted SINAMICS G130
Chassis which is supplying a motor via a shielded motor cable. This example will be used to illustrate the operating
principle of standard and optional line filters.
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Variable-speed drive system PDS comprising a cabinet with a SINAMICS G130 Chassis and a motor
SINAMICS Engineering Manual – May 2008
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