Filter
Top Products
8 - 8 8 - 8
MELSEC-Q
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 CC-Link system, however, ferrite cores cannot be fitted to cables.
(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
(power supply side)
Output side
(device side)
Introduction
Filter
Output side
(device side)
Filter
Input side
(power supply side)
1) The noise will be included when the
input and output wires are bundled.
2) Separate and lay the input
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
FN343-3/01 FN660-6/06 ZHC2203-11
Manufacturer SCHAFFNER SCHAFFNER TDK
Rated current 3 A 6 A 3 A
Rated voltage 250 V