Ferrite Core; Noise Filter (Power Supply Line Filter) - Mitsubishi Electric SW0DNC-MNETH-B User Manual

5 EMC AND LOW VOLTAGE DIRECTIVE

5.1.4 Ferrite core

5.1.5 Noise filter (power supply line filter)

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(3) Grounding cables with a cable clamp
Ground the shield of the external wiring cable to the control panel with the
AD75CK cable clamp (Mitsubishi).(Ground the shield within 20 to 30cm from the
module.).
MELSECNET/H board
Inside the control panel
20 to 30cm
AD75CK
For details on the AD75CK, refer to the following.
• AD75CK-type Cable Clamping Instruction Manual
Ferrite core is effective for reducing radiated noise in the 30MHz to 100MHz frequency
band.
It is recommended to install a ferrite core if a shield cable extended out of the control
panel does not provide sufficient shielding effects.
Install a ferrite core to the cable in the position immediately before the cable is
extended out of the control panel. If the installation position is not appropriate, the
ferrite core will not produce any effect.
(Ferrite core used for the tests conducted by Mitsubishi: TDK ZCAT3035-1330)
Noise filter is effective for reducing conducted noise in the 10MHz or less frequency.
(Use of a noise filter can suppress noise.)
The installation precautions are described below.
(1) 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 filtered cable on the input
side.
Filter
Noise will be induced when the input
and output cables are bundled.
Input side Input side
(power supply side) (power supply side)
Induction
Output side
(device side)
MELSEC
Filter
Output side
(device side)
Separately install the input and
output cables.
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