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.
The protection provided by the devices may be impaired by non-intended use.
All connected devices must be in SELV (Safety Extra Low Voltage)/PELV (Protective Extra Low Voltage) circuits.
Protective earth
A protective conductor is included in the industrial PC's IEC socket for connecting the power supply. Establish the low-resistance protective earth of the industrial PC via the voltage connection, thus avoiding dangerous touch voltages.
If you have ordered the industrial PC with a 24 V power supply unit, a pin for protective earthing (PE) of the device is included in the voltage socket. Establish the low-resistance protective earth of the industrial PC via the voltage connection, thus avoiding dangerous touch voltages.
EMC
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Hardware damage due to electromagnetic interference The use of the device without a functional earth can lead to material damage due to electromagnetic interference.
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Electromagnetic compatibility (EMC) of the device 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.
To do this, the device must comply with certain protection requirements. The device 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. You establish functional earthing via the grounding connection between the grounding bolt in the connection section on the top of the industrial PC (see Fig. 18) and the central grounding point of the control cabinet in which the PC is installed. Use either a wide, flat ground strap or a round conductor with a minimum cross-section of 10 mm2 for the ground connection. In the case of a round conductor, also use a cable lug with a ring and place the ring over the grounding bolt.
