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14. EMC AND LOW VOLTAGE DIRECTIVES
14.1.3 Parts of measure against noise
(1) Ferrite core
A ferrite core has the effect of reducing 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.
Note that the ferrite cores must 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 core will not produce any effect.
• Ferrite core (Recommended product)
Manufacturer Model name
TDK ZCAT3035-1330
(2) Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise.
The attachment of the noise filter to the power supply line of the servo amplifier and system's power supply
is effective for the reducing noise.
(The noise filter has the effect of reducing conducted noise of 10 MHz or less.)
• Recommended noise filters
Manufacturer Model name Rated current (A) Rated voltage (V)
SCHAFFNER
FN343-3/01 3
250
FN660-6/06 6
TDK ZHC2203-11 3
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.
Noise filter
The noise will be included when the
input and output wires are bundled.
Input side
(power supply side)
Induction
Output side
(device side)
Separate and lay the input and
output wires.
Output side
(device side)
Input side
(power supply side)
Noise filter
Figure 14.4 Precautions on noise filter
(b) Ground the noise filter grounding terminal to the control panel with the shortest wire possible (approx.
10cm (3.94 inch)).