NOTE!
Some of the harmonic currents might disturb communication equipment connected to the same transformer or cause resonance in
connection with power-factor correction batteries.
NOTE!
To ensure low harmonic currents, the adjustable frequency drive is standard-equipped with intermediate circuit coils. This normally
reduces the input current I
RMS
by 40%.
The voltage distortion on the line power supply voltage depends on the size of the harmonic currents multiplied by the line power impedance for the
frequency in question. The total voltage distortion THD is calculated on the basis of the individual voltage harmonics using this formula:
THD
%=
U
2
5
+
U
2
7
+ ... +
U
2
N
(U
N
% of U)
2.9.5 Harmonics Emission Requirements
Equipment connected to the public supply network:
Options: Definition:
1 IEC/EN 61000-3-2 Class A for 3-phase balanced equip-
ment (for professional equipment only up to 1.5 hp [1
kW] total power).
2 IEC/EN 61000-3-12 Equipment 16A-75A and professio-
nal equipment as from 1 kW up to 16A phase current.
VLT
®
AQUA Drive Design Guide 2 Introduction to the VLT AQUA Drive
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2-23
2
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