Ferrite Core; Noise Filter (Power Supply Line Filter) - Mitsubishi A1SJH User Manual

9. EMC DIRECTIVE AND LOW-VOLTAGE INSTRUCTION
9.1.4 Power supply module
9.1.5

Ferrite core

9.1.6

Noise filter (power supply line filter)

The precautions required for each power supply module are described below.
Always observe the items noted as precautions.
Model
A1S63P *1 Use a CE-compliant 24VDC internal power supply.
Make sure to short and ground the LG and FG terminals. *2
A1S61PN
A1S62PN
A1SJHCPU
Make sure to short and ground the LG and FG terminals.
A1SJHCPU-S8
*1 If a sufficient filter circuitry is built into a 24 V DC external power supply module, the
noise generated by A1S63P will be absorbed by that filter circuit, so a line filter may not
be required.
Filtering circuitry of version F or later of A1S63P is improved so that a external line filter
is not required.
*2 To ensure the compliance with CE (EN6111-21/A11), make sure to short the LG and FG
terminals using a wire of 6 to 7cm.
A ferrite core has the effect of reducing radiated noise in the 30MHz to 100MHz
band.
It is not required to fit ferrite cores to cables, but it is recommended to fit ferrite
cores if shield cables pulled out of the enclosure do not provide sufficient shielding
effects.
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.
In the CC-Link system, however, ferrite cores cannot be fitted to cables.
The noise filter (power supply line filter) is a device effective to reduce conducted
noise. Except some particular models described in Section 3.1.3 (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
Manufacturer
Rated current
Rated voltage
Precautions
FN343-3/01 FN660-6/06
SCHAFFNER SCHAFFNER
3 A
9 - 7
MELSEC-A
ZHC2203-11
TDK
6 A 3 A
250 V