Siemens MICROMASTER 420 - Table 7-1 Permissible Harmonic Current Emissions

Issue 07/04 7 Electro-magnetic compatibility (EMC)
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
169
7.1.4 EMC Directive Compliance with Imminent Harmonics
Regulations
From 1st January 2001 all electrical apparatus covered by the EMC Directive will
have to comply with EN 61000-3-2 "Limits for harmonic current emissions
(equipment input
≤ 16 A per phase)".
All Siemens variable speed drives of the MICROMASTER, MIDIMASTER,
MICROMASTER Eco and COMBIMASTER ranges, which are classified as
"Professional Equipment" within the terms of the standard, fulfill the requirements
of the standard.
Special considerations for 250 W to 550 W drives with 230 V 1ac mains supplies
when used in non-industrial applications
Units in this voltage and power range will be supplied with the following warning:
”This equipment requires supply authority acceptance for connection to the public
supply network
”. Please refer to EN 61000-3-12 sections 5.3 and 6.4 for further
information. Units connected to Industrial Networks
1
do not require connection
approval (see EN 61800-3, section 6.1.2.2).
The harmonic current emissions from these products are described in the table
below:
Table 7-1 Permissible harmonic current emissions
Rating Typical Harmonic
Current (A)
Typical Harmonic
Current (%)
Typical Voltage Distortion
Distribution Transformer Rating
10 kVA 100 kVA 1 MVA
3
rd
5
th
7
th
9
th
11
th
3
rd
5
th
7
th
9
th
11
th
THD (%) THD (%) THD (%)
250 W 1AC 230 V 2.15 1.44 0.72 0.26 0.19 83 56 28 10 7 0.77 0.077 0.008
370 W 1AC 230 V 2.96 2.02 1.05 0.38 0.24 83 56 28 10 7 1.1 0.11 0.011
550 W 1AC 230 V 4.04 2.70 1.36 0.48 0.36 83 56 28 10 7 1.5 0.15 0.015
The allowed harmonic currents for "professional equipment” with an input power
> 1 kW are not yet defined. Therefore, any electrical apparatus containing the
above drives which has an input power > 1 kW will not require connection
approval.
Alternatively, the necessity to apply for connection approval can be avoided by
fitting the input chokes recommended in the technical catalogues (except 550 W
230 V 1ac units).
1 Industrial Networks are defined as those which do not supply buildings used for domestic purposes.