Beckhoff CPX37**-0010 Series, Installation And Operating Instructions Manual, Page: 26 / 39

Mounting and wiring
CPX37xx-0010 26 Version: 0.1
5.2 Wiring
5.2.1 Preparation and protective earthing
NOTE
The mains plug must be disconnected
Please read the documentation for the external devices prior to connecting them! During thunderstorms,
plug connector must neither be inserted nor removed! When disconnecting a plug connector, always handle
it at the plug. Do not pull the cable!
Connecting cables
The connections are located at the back of the Panel PC and are documented in the chapter Interfaces.
When connecting cables to the Panel PC, please adhere to the following order:
• Disconnect the Panel PC from the power supply.
• Connect all cables at the Panel PC and at the devices to be connected.
• Ensure that all screw connections between connectors and sockets are tight!
• Reconnect all devices to the power supply.
Protective Earthing
Malfunction possible with missing ground connection
A proper ground connection of the device is absolutely necessary for the correct function of the
touchscreen.
The low resistance protective earthing connection of the Control Panel is established via the screw
connection, which is located in the connection area.
A wire cross-section of min. 4 mm
2
is required.