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20.
EMC AND LOW VOLTAGE DIRECTIVES
20.2 Requirements for Compliance with Low Voltage Directives
The Low Voltage Directives apply to the electrical equipment operating from 50 to
1000VAC or 75 to 1500VDC; the manufacturer must ensure the safety of the equipment.
Sections 20.2.1 to 20.2.7 provide precautions on installation and wiring of the MELSEC-
QnA series PLC to conform to The Low Voltage Directives.
The descriptions are made based on the requirements and standards of the latest
regulation. However, they do not guarantee that any machinery produced according to the
contents of this manual is compliant with the above directives.Therefore, manufacturers
must finally determine how to make it comply it and how it is compliant with the low voltage
directives.
20.2.1 Standard applied for MELSEC-QnA series PLC
The standard applied for MELSEC-QnA series PLC is EN61010-1 safety of devices used
in measurement, control, or laboratories.
For the modules which operate with the rated voltage of 50 VAC/75 VDC or above, we
have developed new models that conform to the above standard.
For the modules which operate with the rated voltage less than 50 VAC or 75 VDC,
conventional models can be used, because the low voltage directives do not apply to
them.
20.2.2 Precautions when using the QnA series PLC
Module selection
(1)
(2)
(3)
(4)
(5)
Power supply module
Since a power supply module with the rated input voltage of 100/200VAC has a
potentially hazardous voltage area (42.4V or more at the peak), select a model in
which reinforced insulation is provided between the primary and secondary sides.
For those of 24VDC rated input, conventional models can be used.
I/O module
Since an I/O module with the rated input voltage of 100/200VAC has a potentially
hazardous voltage area, select a model in which reinforced insulation is provided
between the primary and secondary sides.
For those of 24VDC rated input, conventional models can be used.
CPU module, memory card, base unit
Conventional models can be used for these modules, because they only have a
5VDC circuit inside.
Special function module
Conventional models can be used for the special function modules including analog
modules, network modules, and positioning modules, because their rated voltage is
24 V DC or lower.
Display
Use the CE-marked product.
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