Mitsubishi 13J851, Руководство пользователя

Страница: 19 / 270

6
(b) External dimensions of EMC-compliant control panel
600(23.6)
30(1.2)
18
00
(7
0.
9)
1000(39.4)
Unit: mm (inch)
(2) Installing the power supply line and grounding line
Ground the PLC and install the power supply line as shown below.
(a) Position the grounding point on control panel closer to the power
supply module. Then, ground the power supply module’s LG and FG
terminals (LG: Line Ground, FG: Frame Ground) onto the panel with
the thickest and shortest wires possible. (The wire length must be
within 30cm (11.81 in.) or shorter.) As the LG and FG terminals bring
the noise generated within the PLC to the ground, it is necessary to
keep the impedance as low as possible.
Also, make sure to use the wires shortest as possible for grounding,
as they relieve the noise, i.e., include large amount of noise. Doing so
can prevent the grounding wire from being an antenna.
(b) Twist the ground wire led from the grounding point with the power
cable. By doing this, noise from the power cable can be released to
the ground. If a filter is attached to the power cable, however, this
twisting may not be needed.
(c) Attaching a ferrite core to the twisted power line (and grounding line)
reduces the radiated noise.
ZCAT3035-1330 ferrite core (TDK corporation) is recommended.
For details, refer to Section 3.1.4.