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MELSEC-Q
8 EMC AND LOW VOLTAGE DIRECTIVE
8.2 Requirement to Conform to the Low Voltage Directive
The Low Voltage Directive requires each device that operates with the power supply
ranging from 50 to 1000VAC and 75 to 1500VDC to satisfy the safety requirements.
In Sections 8.2.1 to 8.2.6, cautions on installation and wiring of the MELSEC-Q series
PLC to conform to the Low Voltage Directive are described.
We have put the maximum effort to develop this material based on the requirements
and standards of the regulation that we have collected. However, compatibility of the
devices which are fabricated according to the contents of this manual to the above
regulation is not guaranteed. Each manufacturer who fabricates such device should
make the final judgement about the application method of the Low Voltage Directive
and the product compatibility.
8.2.1 Standard applied for MELSEC-Q series PLC
The standard applied for MELSEC-Q series PLC is EN61010-1 safety of devices used
in measurement rooms, control rooms, or laboratories.
The MELSEC-Q series PLC modules which operate at the rated voltage of
50VAC/75VDC or above are also developed to conform to the above standard.
The modules which operate at the rated voltage of less than 50VAC/75VDC are out of
the Low Voltage Directive application range.
8.2.2 MELSEC-Q series PLC selection
(1) Power supply module
There are dangerous voltages (voltages higher than 42.4V peak) inside the
power supply modules of the 100/200VAC rated I/O voltages. Therefore, the CE
marked models are enhanced in insulation internally between the primary and
secondary.
(2) I/O module
There are dangerous voltages (voltages higher than 42.4V peak) inside the I/O
modules of the 100/200VAC rated I/O voltages. Therefore, the CE marked
models are enhanced in insulation internally between the primary and secondary.
The I/O modules of 24VDC or less rating are out of the Low Voltage Directive
application range.
(3) CPU module, memory card, base unit
Using 5VDC circuits inside, the above modules are out of the Low Voltage
Directive application range.
(4) Intelligent function modules (special function modules)
The intelligent function modules (special function modules) such as the analog,
network and positioning modules are 24VDC or less in rated voltage and are
therefore out of the Low Voltage Directive application range.
(5) Display device
Use the CE marked display device.