2.9.3 EMC Test Results (Emission)
The following test results were obtained using a system with an adjustable frequency drive (with options, if relevant), a shielded control cable, a
control box with potentiometer, as well as a motor and motor-shielded cable.
RFI filter type
Phase
type
Conducted emission.
Maximum shielded cable length.
Radiated emission
Industrial environment
Housing,
trades and light
industries
Industrial envi-
ronment
Housing, trades and
light industries
Set-up: 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
1.5–30 hp [1.1–22 kW] 220–240 V S2 150 150 50 Yes No
0.34–60 hp [0.25–45 kW] 200–240 V T2 150 150 50 Yes No
10–50 hp [7.5–37 kW] 380–480 V S4 150 150 50 Yes No
0.5–125 hp [0.37–90 kW] 380–480 V T4 150 150 50 Yes No
H2
1.5–30 hp [1.1–22 kW] 220–240 V S2 25 No No No No
0.34–5 hp [0.25–3.7 kW] 200–240 V T2 5NoNo No No
7.5–60 hp [5.5–45 kW] 200–240 V T2 25 No No No No
0.5–10 hp [0.37–7.5 kW] 380–480 V T4 5NoNo No No
10–50 hp [7.5–37 kW] 380–480 V S4 25 No No No No
15–125 hp [11–90 kW] 380–480 V T4 25 No No No No
150–1350 hp [110–1000 kW] 380–480 V T4 50 No No No No
1–125 hp [0.75–90 kW] 525–600 V T6 150 No No No No
15–125 hp [11–90 kW] 525–690 V T7 Yes No No No No
60–1600 hp [45–1200 kW] 525–690 V T7 150 No No No No
H3
0.34–60 hp [0.25–45 kW] 200–240 V T2 75 50 10 Yes No
0.5–125 hp [0.37–90 kW] 380–480 V T4 75 50 10 Yes No
H4
150–1350 hp [110–1000 kW] 380–480 V T4 150 150 No Yes No
15–125 hp [11–90 kW] 525–690 V T7 No Yes No Yes No
60–550 hp [45–400 kW] 525–690 V T7 150 30 No No No
Hx
1–125 hp [0.75–90 kW] 525–600 V T6 -- - - -
Table 2.1: EMC Test Results (Emission)
2.9.4 General Aspects of Harmonics Emission
An adjustable frequency drive takes up a non-sinusoidal current from the
line power, which increases the input current I
RMS
. A non-sinusoidal cur-
rent is transformed 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 prevent an overload of the transformer and high
temperature in the cables.
2 Introduction to the VLT AQUA Drive VLT
®
AQUA Drive Design Guide
2-22
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2
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