Overview Of Harmonics Emission; Harmonics Emission Requirements; Harmonics Test Results (Emission) - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Product Overview
RFI filter
type
22–90 kW
(30–120 hp)
3 3
3x380–480 V
IP54
Table 3.7 EMC Emission Test Results

3.4.4 Overview of Harmonics Emission

A frequency converter takes up a non-sinusoidal current
from mains, which increases the input current I
sinusoidal current is transformed with a Fourier analysis
and split into sine-wave currents with different frequencies,
that is, different harmonic currents I
frequency:
Hz
Table 3.8 Harmonic Currents
The harmonics do not affect the power consumption
directly, but increase the heat losses in the installation
(transformer, cables). So, in plants with a high percentage
of rectifier load, maintain harmonic currents at a low level
to avoid overload of the transformer and high temperature
in the cables.
Illustration 3.53 DC-link Coils
NOTICE
Some of the harmonic currents might disturb communi-
cation equipment connected to the same transformer or
cause resonance with power factor correction batteries.
To ensure low harmonic currents, the frequency converter
is equipped with DC-link coils as standard. This normally
reduces the input current I
The voltage distortion on the mains supply voltage
depends on the size of the harmonic currents multiplied
by the mains impedance for the frequency in question. The
total voltage distortion THDv is calculated based on the
individual voltage harmonics using this formula:
2
THD % = U
5
(U % of U)
N
40
Conduct emission. Maximum shielded cable length [m (ft)]
Industrial environment
– – 25 (82)
with 50 Hz basic
n
I I
1 5
50 250
by 40%.
RMS
2 2
+ U + ... + U
7 N
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®
VLT HVAC Basic Drive FC 101
– 10 (33)

3.4.5 Harmonics Emission Requirements

Equipment connected to the public supply network
. A non-
RMS
Options
1
2
I
7
350
Table 3.9 Connected Equipment

3.4.6 Harmonics Test Results (Emission)

Power sizes up to PK75 in T4 and P3K7 in T2 complies with
IEC/EN 61000-3-2 Class A. Power sizes from P1K1 and up to
P18K in T2 and up to P90K in T4 complies with IEC/EN
61000-3-12, Table 4.
Actual 0.25–11
kW (0.34–15 hp),
IP20, 200 V
(typical)
Limit for R
Actual 0.25–11
kW (0.34–15 hp),
200 V (typical)
Limit for R
Table 3.10 Harmonic Current 0.25–11 kW (0.34–15 hp), 200 V
Radiated emission
– Yes –
Definition
IEC/EN 61000-3-2 Class A for 3-phase balanced
equipment (for professional equipment only up to 1
kW (1.3 hp) total power).
IEC/EN 61000-3-12 Equipment 16–75 A and profes-
sional equipment as from 1 kW (1.3 hp) up to 16 A
phase current.
Individual harmonic current I
I I
5 7
32.6 16.6
≥120
40 25
sce
Harmonic current distortion factor (%)
THDi
39
≥120
48
sce
No –
/I (%)
n 1
I I
11 13
8.0 6.0
15 10
PWHD
41.4
46
MG18C702