3.1.4 Power supply module
The precautions required for each power supply module are described below.
Always observe the items noted as precautions.
A1NCPU (Power supply), A61P, A62P
A65P, A66P, A67P
3.1.5 Ferrite core
A ferrite core is effective for reducing noise in the band of 30 M Hz to 100 M Hz.
Mounting of a ferrite core is not necessary except for some particular models
described in Section 9.1.3 (2), (3). However if further attenution of noise is
necessary, mounting of a ferrite core on cables which radiate noise is
recommended. When a ferrite core is mounted, mount the ferrite core just before
the point where the cable goes outside of the cabinet. The ferrite will not be effective
if the mounting position is not adequate.
(a) When there is a distance from the
cable exit hole, the noise will jump
over the ferrite, thus the effect will be
Always ground the LG and FG terminals
after short-circuiting them.
Use the 24VDC panel power equipment
conforming to the EU Directive.
(b) When mounted by the cable exit
hole, the noise will not jump over the