9
EMC AND LOW VOLTAGE DIRECTIVES
9.1 Requirements for Conformance to EMC Directive
9.1.6 Others
9 - 13
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
9.1.6 Others
(1) Ferrite core
A ferrite core has the effect of reducing radiated noise in the 30MHz to 100MHz band.
It is not required to fit ferrite cores to cables, but it is recommended to fit ferrite cores if
shield cables pulled out of the enclosure do not provide sufficient shielding effects.
It should be noted that the ferrite cores should be fitted to the cables in the position
immediately before they are pulled out of the enclosure. If the fitting position is
improper, the ferrite will not produce any effect.
(2) Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise.
It is not required to attach the noise filter to the power supply line except the A61PEU,
A62PEU power supply modules and some models, however, attaching it can
suppress more noise.
(The noise filter has the effect of reducing conducted noise of 10 MHz or less.)
The precautions required when installing a noise filter are described below.
• 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.
• Ground the noise filter grounding terminal to the control cabinet with the shortest
wire possible (approx. 10 cm (3.94 inch)).
Remark
Diagram 9.19 Precautions on noise filter
Table9.5 Noise filter specifications
Noise filter model name FN343-3/01 FN660-6/06 ZHC2203-11
Manufacturer SCHAFFNER SCHAFFNER TDK
Rated current 3A 6A 3A
Rated voltage 250V
Filter
Induction
Input side
(power supply side)
Output side
(device side)
Filter
Input side
(power supply side)
Output side
(device side)
The noise will be included when the
input and output wires are bundled.
Separate and lay the input
and output wires.
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