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3.1.6 Noise filter (power supply line filter)
The noise filter (power supply line filter) is a device effective to reduce conducted
noise. Except some particular models described in Section 9.1.3 (5), installation of a
noise filter onto the power supply lines is not necessary. However conducted noise
can be reduced if it is installed. (The noise filter is generally effective for reducing
conducted noise in the band of 10 M Hz or less.) Usage of the following filters is
recommended.
Model name
FN343-3/01
FN660-6/06
ZHC2203-11
Manufacturer SCHAFFNER SCHAFFNER
TDK
Rated current
3A
6A
3A
Rated voltage
250V
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 the noise was filtered.
Filter
Induction
Output side
(device side)
Input side
(power supply side)
Filter
Output side
(device side)
Input side
(power supply side)
(a) The noise will be included when the
input and output wires are bundled.
(b) Separate and lay the inputand output
wires.
(2) Earth the noise filter earthing terminal to the control cabinet with the
shortest wire possible (approx. 10cm (3.94in.)).
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