20 - 10
20. EMC AND LOW VOLTAGE DIRECTIVES
20.1.6 Ferrite core
Use of ferrite cores is effective in reducing conduction noise in the band of about 10MHz
and radiated noise of 30 to 100MHz.
It is recommended to attach ferrite cores when the shield of the shielded cable coming out
of control panel does not work effectively, or when emission of the conduction noise from
the power supply line has to be suppressed.
*1
The ferrite cores used in our tests are TDK's
ZCAT3035.
It should be noted that the ferrite cores should 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 will not produce any effect.
*1 To comply with CE(EN61131-2/A12), make sure to attach 2 or more ferrite cores to the power
supply line.
The position should be as close to the power supply module as possible.
Ferrite core
20.1.7 Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise. With the exception
of A61PEU, A62PEU and A63P, it is not required to fit the noise filter to the power supply
line, but fitting it can further suppress noise. (The noise filter has the effect of reducing
conducted noise of 10 M Hz or less.) Use any of the following noise filters (double type
filters) or equivalent.
The precautions required when installing a noise filter are described below.
(1) 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
noise has been filtered out.
(2) Ground the noise filter ground terminal to the control panel with the shortest wire
possible (approx. 10cm (3.94inch)).
Model: ZCAT2235-1030A (TDK ferrite core)
Contact: TDK Corporation
Model name FN343-3/01 FN660-6/06 ZHC2203-11
Manufacturer SCHAFFNER SCHAFFNER TDK
Rated current 3A 6A 3A
Rated voltage 250V
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