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3.1.4 EMC levels
EN61800-3 defines the division of frequency converters into five classes according to
the level of electromagnetic disturbances emitted, the requirements of a power sys-
tem network and the installation environment (see below). The EMC class of each
product is defined in the type designation code.
Category C1: Frequency converters of this class comply with the requirements of
category C1 of the product standard EN 61800-3 (2004). Category C1 ensures the
best EMC characteristics and it includes converters the rated voltage of which is less
than 1000 V and which are intended for use in the 1st environment.
NOTE: The requirements of class C are fulfilled only as far as the conducted emis-
sions are concerned.
Category C2: Frequency converters of this class comply with the requirements of
category C2 of the product standard EN 61800-3 (2004). Category C2 includes con-
verters in fixed installations and the rated voltage of which is less than 1000 V. The
class C2 frequency converters can be used both in the 1st and the 2nd environment.
Category C3: Frequency converters of this class comply with the requirements of
category C3 of the product standard EN 61800-3 (2004). Category C3 includes con-
verters the rated voltage of which is less than 1000 V and which are intended for use
in the second environment only.
Category C4: The drives of this class do not provide EMC emission protection. These
kinds of drives are mounted in enclosures.
Environments in product standard EN 61800-3 (2004)
First environment: Environment that includes domestic premises. It also includes
establishments directly connected without intermediate transformers to a low-volt-
age power supply network which supplies buildings used for domestic purposes.
NOTE: houses, apartments, commercial premises or offices in a residential building
are examples of first environment locations.
Second environment: Environment that includes all establishments other than
those directly connected to a low-voltage power supply network which supplies
buildings used for domestic purposes.
NOTE : industrial areas, technical areas of any building fed from a dedicated trans-
former are examples of second environment locations.
3.1.5 Changing the EMC protection class from C2 or C3 to C4
The EMC protection class of MI1-3 frequency converters can be changed from class
C2 or C3 to class C4 by
removing the EMC-capacitor disconnecting screw , see fig-
ure below.
Note! Do not attempt to change the EMC level back to class C2 or C3. Even if the pro-
cedure above is reversed, the frequency converter will no longer fulfil the EMC re-
quirements of class C2 / C3!