8 EMC AND LOW VOLTAGE DIRECTIVE
8.1.6 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.
In the
(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.
(a)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.
Input side | Input side |
(power supply side) | (power supply side) |
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| Introduction |
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| Filter |
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| Filter | ||||||||||||||
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| Output side |
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| Output side | |||
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| (device side) |
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| (device side) | |||
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| 1) The noise will be included when the |
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| 2) Separate and lay the input | |||||||||||||||||||||
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| input and output wires are bundled. |
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| and output wires. | ||||||||||||||||||
(b)Earth the noise filter earthing terminal to the control cabinet with the shortest wire possible (approx. 10 cm (3.94 inch)).
Reference
Noise Filter | ||||
Model Name | ||||
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Manufacturer | SCHAFFNER | SCHAFFNER | TDK | |
Rated current | 3 A | 6 A | 3 A | |
Rated voltage |
| 250 V |
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8 - 8 | 8 - 8 |