2.9.3 EMC Test Results (Emission)
The following test results have been obtained using a system with a frequency converter (with options if relevant),
a screened control cable, a control box with potentiometer, as well as a motor and motor screened cable.
RFI filter type
Pha
se
type
Conducted emission.
Maximum shielded cable length.
Radiated emission
Industrial environment
Housing,
trades and
light indus-
tries
Industrial en-
vironment
Housing, trades
and light indus-
tries
Setup:
S / T
EN 55011
Class A2
EN 55011
Class A1
EN 55011
Class B
EN 55011
Class A1
EN 55011 Class B
H1
meter
meter
meter
1.1-22 kW 220-240 V
S2
150
150
50
Yes
No
0.25-45 kW 200-240 V
T2
150
150
50
Yes
No
7.5-37 kW 380-480 V
S4
150
150
50
Yes
No
0.37-90 kW 380-480 V
T4
150
150
50
Yes
No
H2
1.1-22 kW 220-240 V
S2
25
No
No
No
No
0.25-3.7 kW 200-240 V
T2
5
No
No
No
No
5.5-45 kW 200-240 V
T2
25
No
No
No
No
0.37-7.5 kW 380-480 V
T4
5
No
No
No
No
7.5-37 kW 380-480 V
S4
25
No
No
No
No
11-90 kW 380-480 V
T4
25
No
No
No
No
110-1000 kW 380-480 V
T4
50
No
No
No
No
0.75-90 kW 525-600 V
T6
150
No
No
No
No
11-90 kW 525-690 V
T7
Yes
No
No
No
No
45-1200 kW 525-690 V
T7
150
No
No
No
No
H3
0.25-45 kW 200-240 V
T2
75
50
10
Yes
No
0.37-90 kW 380-480 V
T4
75
50
10
Yes
No
H4
110-1000 kW 380-480 V
T4
150
150
No
Yes
No
11-90 kW 525-690 V
T7
No
Yes
No
Yes
No
45-400 kW 525-690 V
T7
150
30
No
No
No
Hx
0.75-90 kW 525-600 V
T6
-
-
-
-
-
Table 2.1: EMC Test Results (Emission)
2.9.4 General Aspects of Harmonics Emission
A frequency converter takes up a non-sinusoidal current from mains,
which increases the input current I
RMS
. A non-sinusoidal current is trans-
formed by means of a Fourier analysis and split up into sine-wave
currents with different frequencies, i.e. different harmonic currents I
N
with 50 Hz as the basic frequency:
Harmonic currents
I
1
I
5
I
7
Hz
50 Hz
250 Hz
350 Hz
The harmonics do not affect the power consumption directly but increase
the heat losses in the installation (transformer, cables). Consequently, in
plants with a high percentage of rectifier load, maintain harmonic cur-
rents at a low level to avoid overload of the transformer and high
temperature in the cables.
VLT
®
AQUA Drive Design Guide
2 Introduction to VLT AQUA Drive
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
29
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