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5.2.2 Emission Requirements
The EMC product standard for frequency converters
defines 4 categories (C1, C2, C3 and C4) with specified
requirements for emission and immunity.
Table 5.3 states
the definition of the 4 categories and the equivalent classi-
fication from EN 55011.
Category Definition
Equivalent
emission
class in EN
55011
C1 Frequency converters installed in
the first environment (home and
office) with a supply voltage less
than 1000 V. Class B
C2 Frequency converters 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 professional. Class A Group 1
C3 Frequency converters installed in
the second environment
(industrial) with a supply voltage
lower than 1000 V. Class A Group 2
C4 Frequency converters 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 5.3 Correlation between IEC 61800-3 and EN 55011
When the generic (conducted) emission standards are
used, the frequency converters are required to comply
with the limits in
Table 5.4 .
Environment
Generic emission
standard
Equivalent
emission class
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 5.4 Correlation between Generic Emission Standards and
EN 55011
5.2.3 Immunity Requirements
The immunity requirements for frequency converters
depend on the environment where they are installed. The
requirements for the industrial environment are higher
than the requirements for the home and office
environment. All Danfoss frequency converters comply
with the requirements for the industrial environment and
consequently comply also with the lower requirements for
home and office environment with a large safety margin.
To document immunity against electrical interference from
electrical phenomena, the following immunity tests have
been made in accordance with following basic standards:
•
EN 61000-4-2 (IEC 61000-4-2): Electrostatic
discharges (ESD): Simulation of electrostatic
discharges from human beings.
•
EN 61000-4-3 (IEC 61000-4-3): Incoming electro-
magnetic field radiation, amplitude modulated
simulation of the effects of radar and radio
communication equipment as well as mobile
communications equipment.
•
EN 61000-4-4 (IEC 61000-4-4): Burst transients:
Simulation of interference brought about by
switching a contactor, relay or similar devices.
•
EN 61000-4-5 (IEC 61000-4-5): Surge transients:
Simulation of transients brought about e.g. by
lightning that strikes near installations.
•
EN 61000-4-6 (IEC 61000-4-6):
RF Common
mode: Simulation of the effect from radio-
transmission equipment joined by connection
cables.
See Table 5.5 .
System Integration
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
MG33BF02 - Rev. 2013-12-20 51
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