9
EMC AND LOW VOLTAGE DIRECTIVES
9.1 Requirements for Conformance to EMC Directive
9.1.1 Standards relevant to the EMC Directive
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CHAPTER9 EMC AND LOW VOLTAGE DIRECTIVES
For the products sold in European countries, the conformance to the EMC Directive, which
is one of the European directives, has been a legal obligation since 1996. Also,
conformance to the Low Voltage Directive, another European Directive, has been a legal
obligation since 1997.
Manufacturers who recognize their products must conform to the EMC and Low Voltage
Directives are required to declare that their products conform to these Directives and put a
"CE mark" on their products.
9.1 Requirements for Conformance to EMC Directive
The EMC Directive specifies that products placed on the market must "be so constructed
that they do not cause excessive electromagnetic interference (emissions) and are not
unduly affected by electromagnetic interference (immunity)".
The applicable products are requested to meet these requirements. The Section 9.1.1
through Section 9.1.5 summarize the precautions on conformance to the EMC Directive of
the machinery constructed using the MELSEC-QS series PLCs.
The details of these precautions has been prepared based on the control requirements
and the applicable standards control. However, we will not assure that the overall
machinery manufactured according to these details conforms to the above-mentioned
directives. The method of conformance to the EMC Directive and the judgment on whether
or not the machinery conforms to the EMC Directive must be determined finally by the
manufacturer of the machinery.
9.1.1 Standards relevant to the EMC Directive
The standards relevant to the EMC Directive are listed in Table9.1.
Table9.1 Standards relevant to the EMC Directive
Specification
Test Item
Test Details
Standard Value
EN61131-2 :
2003
EN55011(CISPR11)
Radiated emission
*2
Radio waves from the product
are measured.
30M-230MHz QP:
40dB V/m (10m (32.81 ft.) in
measurement range)
*1
230M-1000MHz QP:
47dB V/m(10m (32.81 ft.) in
measurement range)
EN55011(CISPR11)
Conducted emission
Noise from the product to the
power line is measured.
150k-500kHz QP
Mean
500k-30MHz QP
Mean
: 79dB
: 66dB
*1
: 73dB
: 60dB
