9
EMC AND LOW VOLTAGE DIRECTIVES
9.2 Requirement to Conform to the Low Voltage Directive
9.2.1 Standard applied for MELSEC-Q series programmable controller
9 - 15
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
9.2 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 Section 9.2.1 to Section 9.2.6, cautions on installation and wiring of the MELSEC-Q
series programmable controller to conform to the Low Voltage Directive are described.
These descriptions are based on the requirements and standards of the regulation,
however, it does not guarantee that the entire machinery manufactured based on the
descriptions conforms to the above-mentioned directive. The method and judgment for the
conformity to the low voltage directive must be left to the manufacturer's own discretion.
9.2.1 Standard applied for MELSEC-Q series programmable controller
The standard applied for MELSEC-Q series programmable controller is EN61131-2 safety
of devices used in measurement rooms, control rooms, or laboratories.
The MELSEC-Q series programmable controller 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.
For products with the CE mark, refer to the "Standard Compliance" menu of the
MELFANSweb homepage.
9.2.2 MELSEC-Q series programmable controller 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 such as analog-digital converter modules, digital-
analog converter modules, network modules, and positioning modules (special
function modules) are out of the scope of the low voltage directive because the rated
voltage is 24VDC or less.
(5) Display device
Use the CE marked display device.