Beckhoff C6920, Manual

Page: 27 / 52

Commissioning
C6920 27 Version: 3.2
4.3.2 Grounding of the Industrial PC
Potential differences are minimized and electrical currents are diverted to the ground through grounding or
potential equalization of electronic devices. This is to prevent dangerous touch voltages and electromagnetic
interference.
At the lower end of the Industrial PC mounting plate there is an grounding screw (see also chapter 3.1
Structure [ } 9] ), via which the functional earth of the PC can be connected. Use cables with a cross-section
of at least 4 mm
2
to connect the protective conductor.
Protective earth
Establish the low-resistance protective earth of the Industrial PC via the voltage connection, thus avoiding
dangerous contact voltages. There is a pin in the voltage socket for the protective earth (PE).
EMC
NOTE
Hardware damage due to electromagnetic interference
Using the Industrial PC without functional earthing can lead to hardware damage due to electromagnetic in-
terference.
• Only use the device with functional earthing.
Electromagnetic compatibility (EMC) of the industrial PC includes on the one hand not affecting other
devices and equipment by electromagnetic interference and on the other hand not being disturbed by
electrical or electromagnetic effects itself.
For this purpose, the Industrial PC must comply with certain protection requirements. The Industrial PC has
EMC interference immunity according to EN 61000-6-2. The EMC interference emission of the device meets
the requirements of EN 61000-6-4.
The functional earth is necessary for the EMC of the device. The functional earth is established by
connecting the grounding point on the PC mounting plate to the central grounding point of the control cabinet
in which the PC is installed.