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MELSEC-Q
8 EMC AND LOW VOLTAGE DIRECTIVE
8 EMC AND LOW VOLTAGE DIRECTIVE
For the products sold in European countries, the conformance to the EMC Directive,
which is one of the European Directive, 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 Directive required to declare that their products conform to these Directives
and put a "CE mark" on their products.
8.1 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 sections 8.1.1
through 8.1.6 summarize the precautions on conformance to the EMC Directive of the
machinery constructed using the MELSEC-Q 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.
8.1.1 Standards applicable to the EMC Directive
The standards applicable to the EMC Directive are listed below.
Specification Test item Test details Standard value
EN55011
Radiated noise
2
Electromagnetic emissions from the
product are measured.
30 M-230 MHz QP : 30 dB
V/m
(30 m in measurement range)
1
230 M-1000 MHz QP : 37 dB
V/m
(30 m in measurement range)
EN50081-2 :
1995
EN55011
Conducted noise
Electromagnetic emissions from the
product to the power line is
measured.
150 k-500 kHz QP : 79 dB, Mean : 66 dB
1
500 k-30 MHz QP : 73 dB, Mean : 60 dB
EN61000-4-2
Electrostatic immunity
2
Immunity test in which static
electricity is applied to the cabinet of
the equipment.
15 k V Aerial discharge
EN61000-4-4
Fast transient burst noise
2
Immunity test in which burst noise is
applied to the power line and signal
lines.
Power line : 2 kV
Digital I/O (24 V or higher) : 1 kV
(Digital I/O (24 V or less)) > 250 V
(Analog I/O, signal lines) > 250 V
EN61000-4-3
Radiated field AM
modulation
2
Immunity test in which field is
irradiated to the product.
10 V/m, 26-1000 MHz,
80%AM modulation@1 kHz
EN61131-2 :
1996
EN61000-4-12
Damped oscillatory wave
immunity
Immunity test in which a damped
oscillatory wave is superimposed on
the power line.
Power line : 1 kV
Digital I/O (24 V or higher) : 1 kV
( 1) QP : Quasi-peak value, Mean : Average value
(
2) The PLC is an open type device (device installed to another device) and must be installed in a conductive control panel.
The tests for the corresponding items were performed while the PLC was installed inside a control panel.
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