Mitsubishi Electric NZ2GN2S1-32D User Manual page 200

Others
■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 shielded cables coming out of the control panel do not provide sufficient shielding
effects.
However, for an input module, attach a ferrite core to the cable of the power supply of the connection target device.
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.
For Ethernet cables as well as terminals that are connected to the module power supply of the I/O module and the external
power supply, attach a ferrite core 4cm away from the I/O module.
The ferrite core has the effect of reducing externally conducted noise as well.
For an input module and an I/O combined module, attach a ferrite core to the cable of the power supply of the connection
target device.
(Ferrite core used for the tests conducted by Mitsubishi: TOKIN Corporation ESD-SR-250, TDK Corporation ZCAT3035-1330)
Ex.
Ferrite core attachment example
■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 10MHz or less.)
Connect a noise filter to the external power supply of the I/O module. Use a noise filter with the damping characteristics
equivalent to those of RSEN-2006 (manufactured by TDK-Lambda Corporation). Note that a noise filter is not required if the
module is used in Zone A defined in EN61131-2.
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.
Filter
Input side (power supply side)
Filter
• Ground the noise filter grounding terminal to the control panel with the shortest cable possible (approx. 10cm).
APPX
198
Appendix 5 EMC and Low Voltage Directives
Input side (power supply side)
Induction
Output side (device side)
Output side (device side)
• Problem example
Noise is induced when the input and output cables are bundled.
• Example of improvement
Install the input and output cables separately.