Emission Requirements - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Product Overview
level alongside motor and brake cables. Radio interference
higher than 50 MHz (airborne) is especially generated by
the control electronics.
z
L1
z
L2
z
L3
z
PE
PE
3
1 Ground wire
4 Frequency converter
Illustration 3.52 Generation of Leakage Currents

3.4.2 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 3.5 states
the definition of the 4 categories and the equivalent classi-
fication from EN 55011.
MG18C702
Design Guide
C
S
U
I
1
V
W
I
2
I
3
C
S
I
4
4
2 Shield
5 Shielded motor cable
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C
S
1
2
I
4
5
3 AC mains supply
6 Motor
EN/IEC
61800-3 Definition
Category
Frequency converters installed in
the first environment (home and
C1
office) with a supply voltage less
than 1000 V.
Frequency converters installed in
the first environment (home and
office) with a supply voltage less
C2 than 1000 V, which are neither
plug-in nor movable and are
intended to be installed and
commissioned by a professional.
Frequency converters installed in
the second environment (industrial)
C3
with a supply voltage lower than
1000 V.
Frequency converters installed in
the second environment with a
supply voltage equal to or above
C4
1000 V or rated current equal to or
above 400 A or intended for use in
complex systems.
Table 3.5 Correlation between IEC 61800-3 and
EN 55011
C
S
C
C
S
S
6
Equivalent
emission class
in EN 55011
Class B
Class A Group 1
Class A Group 2
No limit line.
Make an EMC
plan.
37
3 3