Chapter 11 Compliance with EMC Specifications
11-2
11.1.2 Panel
The PLC is a kind of open device(installed on another device) and it should be installed in a panel. It is because the installation may
prevent a person from suffering from an accident due to electric shock as the person contacts with the product(XGT PLC) and the
panel can attenuates the noise generating from the PLC.
In case of XGT PLC, to restrict EMI emitted from a product, it should be installed in a metallic panel. The specifications of the metallic
panel are as follows.
1) Panel
The panel for PLC should be installed and manufactured as follows.
(1) The panel should be made of SPCC(Cold Rolled Mild Steel)
(2) The plate should be 1.6mm and thicker
(3) The power supplied to the panel should be protected against surge by using insulated transformer.
(4) The panel should be structured so that electric wave is not leaked outside. For instance, make the door as a box as
presented below. The main frame should be also designed to be covered the door in order to restrict any radiating noise
generated from the PLC.
(5) The inside plate of panel should have proper conductivity with a wide surface as possible by eliminating the plating of
the bolt used to be mounted on the main frame in order to secure the electric contact with the frame.
Panel Main frame
Door
Visor