2.9.2 Emission Requirements
According to the EMC product standard for adjustable speed adjustable frequency drives EN/IEC61800-3:2004, the EMC requirements depend on the
intended use of the adjustable frequency drive. Four categories are defined in the EMC product standard. The definitions of the four categories together
with the requirements for line power supply voltage-conducted emissions are given in the table below:
Category Definition
Conducted emission requirement
according to the limits given in
EN55011
C1 adjustable frequency drives installed in the first environment (home and office) with a
supply voltage less than 1,000 V.
Class B
C2 adjustable frequency drives installed in the first environment (home and office) with a
supply voltage of less than 1000 V, which are neither plug-in nor movable and are in-
tended to be installed and commissioned by a professional.
Class A Group 1
C3 adjustable frequency drives installed in the second environment (industrial) with a supply
voltage lower than 1,000 V.
Class A Group 2
C4 adjustable frequency drives installed in the second environment with a supply voltage
above 1,000 V and rated current above 400 A or intended for use in complex systems.
No limit line.
An EMC plan should be made.
When the generic emission standards are used the adjustable frequency drives are required to comply with the following limits:
Environment Generic standard
Conducted emission requirement ac-
cording to the limits given in
EN55011
First environment
(home and office)
EN/IEC61000-6-3 Emission standard for residential, commercial and
light industrial environments.
Class B
Second environment
(industrial environment)
EN/IEC61000-6-4 Emission standard for industrial environments. Class A Group 1
VLT
®
AQUA Drive Design Guide 2 Introduction to the VLT AQUA Drive
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
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