Danfoss VLT AutomationVTDrive FC322 Design Manual page 37

2 Introduction to VLT Automation VT Drive
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.
2
Phas
RFI filter type e
Maximum shielded cable length.
type
Industrial environment
EN 55011 Class
Setup: S / T
A2
H1 meter
1.1-22 kW 220-240 V S2 150
0.25-45 kW 200-240 V T2 150
7.5-37 kW 380-480 V S4 150
0.37-90 kW 380-480 V T4 150
H2
1.1-22 kW 220-240 V S2 25
0.25-3.7 kW 200-240 V T2 5
5.5-45 kW 200-240 V T2 25
0.37-7.5 kW 380-480 V T4 5
7.5-37 kW 380-480 V S4 25
11-90 kW 380-480 V T4 25
110-1000 kW 380-480 V T4 50
0.75-90 kW 525-600 V T6 150
11-90 kW 525-690 V T7 Yes
45-1200 kW 525-690 V T7 150
H3
0.25-45 kW 200-240 V T2 75
0.37-90 kW 380-480 V T4 75
H4
110-1000 kW 380-480 V T4 150
11-90 kW 525-690 V T7 No
45-400 kW 525-690 V T7 150
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 . A non-sinusoidal current is trans-
RMS
formed by means of a Fourier analysis and split up into sine-wave cur-
rents with different frequencies, i.e. different harmonic currents I
50 Hz as the basic frequency:
The harmonics do not affect the power consumption directly but increase
the heat losses in the installation (transformer, cables). Consequently, in
36
MG.20.X1.22 - VLT
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Automation VT Drive FC322 Design Guide
Conducted emission.
Radiated emission
Housing, trades
Industrial environ- Housing, trades and
and light indus-
ment light industries
tries
EN 55011 EN 55011 Class
EN 55011 Class A1 EN 55011 Class B
Class A1 B
meter meter
150 50 Yes No
150 50 Yes No
150 50 Yes No
150 50 Yes No
No No No No
No No No No
No No No No
No No No No
No No No No
No No No No
No No No No
No No No No
No No No No
No No No No
50 10 Yes No
50 10 Yes No
150 No Yes No
Yes No Yes No
30 No No No
- - - -
Harmonic currents I I
1 5
Hz 50 Hz 250 Hz 350 Hz
with
N
®
is a registered Danfoss trademark
I
7