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9.1 Requirements for Conformance to EMC Directive
9.1.5 Others
9
EMC AND LOW VOLTAGE DIRECTIVES
(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 fit the noise filter to the power supply line, but fitting it can further
suppress 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.
• Earth the noise filter earthing terminal to the control cabinet with the shortest wire
possible (approx. 10 cm (3.94 inch)).
Remark
Figure 9.9 Precautions on noise filter
Table9.2 Noise filer 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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