Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 132

(9) Others
(a) Ferrite core
A ferrite core has the effect of reducing radiated noise in the 30MHz to 100MHz band.
It is recommended to attach ferrite cores if shield cables coming out from pulled out of the control panel do not
provide sufficient shielding effects.
Note that the ferrite cores must be attached at the position closest to the cable hole inside the control panel. If
attached at an improper position, the ferrite core will not produce any effect.
Attach a ferrite core to each power line as illustrated below.
Example
(b) Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise. Attaching the filter can suppress more
noise. (The noise filter has the effect of reducing conducted noise of 10 MHz or less.)
The precautions for attaching a noise filter are described below.
• Do not bundle the cables on the input side and output side of the noise filter. If bundled, the output side
noise will be induced into the input side cables from which the noise was filtered.
Noise will be induced when the input
and output wires are bundled.
• Ground the noise filter grounding terminal to the control panel with the shortest cable possible (approx.
10cm).
130
Input side
(power supply side)
Induction
Filter
Output side
(device side)
Input side
(power supply side)
Filter
Separately install the input and
output wires.
Output side
(device side)