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11 EMC AND LOW VOLTAGE DIRECTIVE
MELSEC-ST
11.2 Requirement for Compliance with 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.
The sections 11.2.1 to 11.2.6, outline the precautions when installing and wiring the
MELSEC-ST series in compliance with the Low Voltage Directive.
The description are based on the regulations, relevant requirements and standards
that Mitsubishi has satisfied, however, are not for assuring that the machinery is
compliant with the above Directives, even if it is built according to the description.
Therefore, the manufacturer who actually built the machinery should make a decision
on how to comply with the Low Voltage Directive and if the machinery is compliant with
the standard or not.
11.2.1 Standard applied for MELSEC-ST series
The standard applied for MELSEC-ST series is EN61010-1 safety of devices used in
measurement rooms, control rooms, or laboratories.
The MELSEC-ST series modules which operate at the rated voltage of 50VAC/75VDC
or above are also developed to comply with 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.
11.2.2 MELSEC-ST series selection
(1) Power distribution module
As it has a rated voltage of 24VDC or less, the power distribution module is not
the target of the Low Voltage Directive.
(2) I/O module
The I/O modules that have the rated I/O voltage of 100/200VAC include
dangerous voltage inside. Therefore, the CE-marked models are reinforced-
insulated between the internal primary and secondary sides.
The I/O modules of 24VDC or less rating are not the target of the Low Voltage
Directive.
(3) Head module
As it uses only a 5VDC circuit internally, the head module is not the target of the
Low Voltage Directive.
(4) Intelligent function module
As it has a rated voltage of 24VDC or less, the intelligent function modules are
not the target of the Low Voltage Directive.
Summary of Contents for MELESEC-ST
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