Chapter9 Emc And Low Voltage Directives; Requirements For Conformance To Emc Directive; Standards Relevant To The Emc Directive - Mitsubishi MELSEC User Manual

9
EMC AND LOW VOLTAGE DIRECTIVES

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.
Specification Test Item
EN55011(CISPR11)
Radiated emission
EN61131-2 :
2003
EN55011(CISPR11)
Conducted emission
Table9.1 Standards relevant to the EMC Directive
Test Details
Radio waves from the product
*2
are measured.
Noise from the product to the
power line is measured.
9.1 Requirements for Conformance to EMC Directive
9.1.1 Standards relevant to the EMC Directive
Standard Value
30M-230MHz QP:
40dB V/m (10m (32.81 ft.) in
*1
measurement range)
230M-1000MHz QP:
47dB V/m(10m (32.81 ft.) in
measurement range)
150k-500kHz QP
: 79dB
Mean
: 66dB
500k-30MHz QP
: 73dB
Mean
: 60dB
9
10
11
12
*1
9
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