
9. EMC DIRECTIVE AND LOW-VOLTAGE INSTRUCTION
9 - 8
MELSEC-A
The precautions required when installing a noise filter are described below.
(1)
Do not bundle the wires on the input side and output side of the noise filter.
When bundled, the output side noise will be induced into the input side wires
from which the noise was filtered.
Filter
Input side
(power supply side)
Introduction
Output side
(device side)
(a) The noise will be included when the
input and output wires are bundled.
Filter
Input side
(power supply side)
Output side
(device side)
(b) Separate and lay the input
and output wires.
(2)
Earth the noise filter earthing terminal to the control cabinet with the shortest
wire possible (approx. 10 cm (3.94 in.)).
9.2
Requirement to Conform to the Low-Voltage Instruction
The low-voltage instruction, one of the European Instructions, is now regulated.
The low-voltage instruction require each device which operates with power supply
ranging from 50 V AC to 1000 V and 75 V DC to 1500 V to satisfy necessary safety
items.
In the Sections from 3.2.1 to 3.2.8, cautions on installation and wiring of the
MELSEC-AnS series PLC to conform to the low-voltage instruction regulation 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 instruction and the product compatibility.
9.2.1
Standard applied for AnS series
The standard applied for AnS 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 50 V AC/75 V DC or
above, we have developed new models that conform to the above standard.
For the modules which operate with the rated voltage under 50 V AC/75 V DC, the
conventional models can be used, because they are out of the low-voltage
instruction application range.
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