2.8.1 Emission Requirements
According to the EMC product standard for adjustable frequency drives, EN/IEC 61800-3:2004 the EMC requirements depend
on the intended use of the adjustable frequency drive. The EMC product standard defines four categories. The four
categories and the requirements for line power supply voltage conducted emissions are defined in Table 2.9.
Category Definition
Conducted emission requirement
according to the limits given in
EN 55011
C1 Adjustable frequency drives installed in the first environment (home and
office) with a supply voltage less than 1000 V.
Class B
C2 Adjustable frequency drives installed in the first environment (home and
office) with a supply voltage less than 1000 V, which are neither plug-in nor
movable and are intended to be installed and commissioned by a profes-
sional.
Class A Group 1
C3 Adjustable frequency drives installed in the second environment (industrial)
with a supply voltage lower than 1000 V.
Class A Group 2
C4 Adjustable frequency drives installed in the second environment with a
supply voltage equal to or above 1000 V or rated current equal to or above
400 A or intended for use in complex systems.
No limit line.
An EMC plan should be made.
Table 2.9 Emission Requirements
When the generic (conducted) emission standards are used, the adjustable frequency drives are required to comply with the
following limits
Environment Generic standard
Conducted emission requirement
according to the limits given in
EN 55011
First environment
(home and office)
EN/IEC 61000-6-3 Emission standard for residential,
commercial and light industrial environments.
Class B
Second environment
(industrial environment)
EN/IEC 61000-6-4 Emission standard for industrial
environments.
Class A Group 1
Table 2.10 Limits at Generic Emission Standards
Product Overview Design Guide
36 Danfoss A/S © Rev. 2014-01-14 All rights reserved. MG18C522
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