1
2
z
z
z
L1
L2
L3
PE
U
V
W
C
S
I
2
I
1
I
3
I
4
C
S
C
S
C
S
C
S
I
4
C
S
z
PE
3
4
5
6
175ZA062.12
1
Ground wire
3
AC mains supply
5
Screened motor cable
2
Screen
4
Frequency converter
6
Motor
Illustration 2.7 Generation of Leakage Currents
2.7.2 Emission Requirements
The EMC product standard for frequency converters
defines 4 categories (C1, C2, C3, and C4) with specified
requirements for emission and immunity.
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 not plug-in
and not movable, and must 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
Category
Definition
Equivalent
emission class
in EN 55011
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.
Make an EMC
plan.
Table 2.4 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
.
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 2.5 Correlation between Generic Emission Standards and
EN 55011
Product Overview
VLT
®
Compressor Drive CDS 803
20
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MG18N202
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