Mitsubishi Electric MELSEC iQ-R Series - Page 179

APPX
Appendix 6 EMC and Low Voltage Directives
177
A
■ Ferrite core
A ferrite core is effective for reducing radiated noise in the 30MHz to 100MHz frequency band.
It is recommended to install a ferrite core if a shield cable extended out of the control panel does not provide sufficient
shielding effects.
Install a ferrite core to the cable in the position just before the cable is extended out of the control panel. If the installation
position is not appropriate, the ferrite core will not produce any effect.
Install a ferrite core to each power cable as shown below.
• (Ferrite core used for the tests conducted by Mitsubishi: ESD-SR-250 manufactured by NEC TOKIN Corporation)
Ex.
Connectors for external devices
When a module that requires a connector for external devices is used, take the following noise reduction measures.
• When shielded cables are connected
The following figure shows an example of wiring against noise when a connector (A6CON1) is used.
• When shielded cables are processed
(1) The length between the connector and the shielded cables should be the shortest possible.
(2) Ground the FG wire of 2 or more as short as possible. Ground it to the control panel on the module side.
(3) Shielded cable
(1) Strip the jacket of each shield of the cables.
(2) Solder the shield of any shielded cable to the FG wire.
(3) Bundle the shields with conductive tape.
(4) To protect the wires, cover the connector pins with heat shrinkable insulating tubes. Exposed wires may cause malfunction of the module due to static
electricity.
(5) Cover the conductive part with insulating tape.
A6CON1
(3)
(2)
(1)
(5)
(4)
(2)
(1), (3)