Danfoss VLT Flow Drive FC 111, Design Manual, Page: 36 / 148

Limit for R
sce
≥120 48 46
If the short-circuit power of the supply S
sc
is greater than or equal to:
S
SC
= 3 × R
SCE
× U
mains
× I
equ
= 3 × 120 × 400 × I
equ
at the interface point between the user’s supply and the public system (R
sce
).
The installer or user of the equipment is responsible for ensuring that the equipment is connected only to a supply with a short-
circuit power S
sc
greater than or equal to what is specified above. If necessary, consult with the distribution network operator. Other
power sizes can be connected to the public supply network by consultation with the distribution network operator.
Compliance with various system level guidelines: The harmonic current data in
Table 13 to Table 15 are given in accordance with
IEC/EN 61000-3-12 with reference to the Power Drive Systems product standard. They may be used as the basis for calculation of the
harmonic currents' influence on the power supply system and for the documentation of compliance with relevant regional guide-
lines: IEEE 519 -1992; G5/4.
If there is a need for further reduction of harmonic currents, passive or active filters in front of the drives can be installed. Consult
Danfoss for further information.
3.4.5 Harmonics Emission Requirements
Equipment is connected to the public supply network.
Table 16: Connected Equipment
Options Definition
1 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).
2 IEC/EN 61000-3-12 Equipment 16–75 A and professional equipment as from 1 kW (1.3 hp) up to 16 A phase current.
3.4.6 Harmonics Test Results (Emission)
Power sizes up to PK75 in T4 complies with IEC/EN 61000-3-2 Class A. Power sizes from P1K1 and up to P90K in T4 complies with
IEC/EN 61000-3-12, Table 4.
Table 17: Harmonic Current 0.37–22 kW (0.5–30 hp), 380-480 V
Individual harmonic current I
n
/I
1
(%)
I
5
I
7
I
11
I
13
Actual 0.37–22 kW (0.5–30 hp), IP20, 380-480 V (typical)
36.7 20.8 7.6 6.4
Limit for R
sce
≥120 40 25 15 10
Harmonic current distortion factor (%)
THDi PWHD
Actual 0.37–22 kW (0.5–30 hp), 380-480 V (typical) 44.4 40.8
Limit for R
sce
≥120 48 46
Table 18: Harmonic Current 30–90 kW (40–120 hp), 380-480 V
Individual harmonic current I
n
/I
1
(%)
I
5
I
7
I
11
I
13
Actual 30–90 kW (40–120 hp), IP20, 380-480 V (typical) 36.7 13.8 6.9 4.2
Limit for R
sce
≥120 40 25 15 10
Harmonic current distortion factor (%)
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Product Overview
VLT® Flow Drive FC 111
Design Guide