Others - Mitsubishi MELESEC-ST User Manual

11 EMC AND LOW VOLTAGE DIRECTIVE

11.1.5 Others

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(1) Ferrite core
A ferrite core is effective for reducing radiated noise in the band of 30 to 100MHz.
It is not required to attach a ferrite core to a cable. However, this method is
recommend when the shield cable pulled out from the control box cannot provide
the shielding effect.
Make sure to attach a ferrite core to a cable inside the control panel at the
position closes to the cable hole. If attached at an improper position, the ferrite
core will not function effectively.
(2) Noise filter (power line filter)
A noise filter is effective for conducted noise. It is not required to attach a noise
filter to the power line. However, this component is recommended as it can
further suppress noise. (A noise filter is effective for reducing conducted noise in
the band of 10MHz or less.)
The precautions required when attaching a noise filter are described below.
(a) Do not install the input and output cables of the noise filter together to
prevent the input noise inducting into the output cable.
Filter
1) Installing the input and output cables
together will cause noise induction.
(b) Connect the noise filter's ground terminal to the control panel with the
shortest cable as possible (approx. 10cm (3.94 in.) or less).
Recommended models
Noise Filter
Model Name
Manufacturer
Rated current
Rated voltage
Input side Input side
(power supply side) (power supply side)
Induction
Output side
(device side)
FN343-3/01
SCHAFFNER
3 A
MELSEC-ST
Filter
2) Separate the input from the output
cable.
FN660-6/06 ZHC2203-11
SCHAFFNER
6 A
250 V
Output side
(device side)
TDK
3 A
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