Mitsubishi A2USCPU(S1), User Manual

Page: 156 / 272

9 - 11
9. EMC AND LOW VOLTAGE DIRECTIVES
9.2 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 adequate safety of the
equipment.
Guidelines for installation and wiring of MELSEC-AnS series programmable controller are
provided in 9.2.1 to Section 9.2.7 for the purpose of compliance with the EMC Directives.
The guidelines are created based on the requirements of the regulations and relevant
standards, however, they do not guarantee that the machinery constructed according to
them will comply with the Directives. Therefore, the manufacturer of the machinery must
finally determine how to make it comply with the EMC Directives: if it is actually compliant
with the EMC Directives.
9.2.1 Standard applied for MELSEC-AnS series programmable controller
The standard applied for MELSEC-AnS series programmable controller series is
EN61010-1 safety of devices used in measurement rooms, control rooms, or laboratories.
For the modules which operate with the rated voltage of 50VAC/75VDC or above, we have
developed new models that conform to the above standard.
For the modules which operate with the rated voltage under 50VAC/75VDC, the
conventional models can be used, because they are out of the low voltage directive
application range.
9.2.2 Precautions when using the MELSEC-AnS series programmable controller
Module selection
(1) Power supply module
For a power supply module with rated input voltage of 100/200VAC, select a model in
which the internal part between the first order and second order is intensively
insulated, because it generates hazardous voltage (voltage of 42.4V or more at the
peak) area.
For a power supply module with 24VDC rated input, a conventional model can be
used.
(2) I/O module
For I/O module with rated I/O voltage of 100/200VAC, select a model in which the
internal area between the first order and second order is intensively insulated,
because it has hazardous voltage area.
For I/O module with 24VDC rated input, a conventional model can be used.
(3) CPU module, memory cassette, base unit
Conventional models can be used for these modules, because they only have a
5VDC circuit inside.
(4) Special function module
Conventional models can be used for the special function modules including analog
module, network module, and positioning module, because the rated voltage is
24VDC or smaller.
(5) Display device
Use the CE-marked product.