2.9.6 Harmonics Test Results (Emission)
Individual Harmonic Current I
n
/I
1
(%)
Harmonic current destination factor (%)
I
5
I
7
I
11
I
13
THD PWHD
Actual (typical) 40 20 10 8 46 45
Limit for R
sce
≥120
40 25 15 10 48 46
Power sizes up to PK75 in T2 and T4 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. Power sizes P110 - P450 in T4 also complies with IEC/EN 61000-3-12 even though not required because currents are above 75
A.
Table 4, R
sce
>= 120, THD <= 48% and PWHD >=46% provided that the short-circuit power of the supply S
sc
is greater than or equal to:
S
SC
= 3 ×
R
SCE
×
U
line power
×
I
equ
= 3 × 120 × 400 ×
I
equ
at the interface point between the user’s supply and the public system.
It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the
equipment is connected only to a supply with a short-circuit power S
sc
greater than or equal to specified above.
Other power sizes can be connected to the public supply network by consultation with the distribution network operator.
2.10 Immunity Requirements
The immunity requirements for adjustable frequency drives depend on the environment where they are installed. The requirements for the industrial
environment are higher than the requirements for the home and office environment. All Danfoss adjustable frequency drives comply with the requirements
for the industrial environment and consequently comply also with the lower requirements for home and office environment with a large safety margin.
In order to document immunity against electrical interference from electrical phenomena, the following immunity tests have been made on a system
consisting of an adjustable frequency drive (with options if relevant), a shielded control cable and a control box with potentiometer, motor cable and
motor.
The tests were performed in accordance with the following basic standards:
• EN 61000-4-2 (IEC 61000-4-2): Electrostatic discharges (ESD): Simulation of electrostatic discharges from human beings.
• EN 61000-4-3 (IEC 61000-4-3): Incoming electromagnetic field radiation, amplitude modulated simulation of the effects of radar and radio
communication equipment as well as mobile communications equipment.
• EN 61000-4-4 (IEC 61000-4-4): Electrical interference: Simulation of interference brought about by switching a contactor, relay or similar
devices.
• EN 61000-4-5 (IEC 61000-4-5): Surge transients: Simulation of transients brought about, e.g., by lightning that strikes near installations.
• EN 61000-4-6 (IEC 61000-4-6): RF Common mode: Simulation of the effect from radio-transmission equipment joined by connection cables.
2 Introduction to the VLT AQUA Drive VLT
®
AQUA Drive Design Guide
2-24
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2
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