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 power supply socket. Here, too, establish the low-resistance protective grounding of the industrial PC via the voltage connection and thus avoid dangerous touch voltages, e.g. if a 230 V line of a neighboring device comes into contact with the housing of the PC in the event of a fault.
EMC
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Hardware damage due to electromagnetic interference Using the industrial PC without functional earthing can lead to hardware damage due to electromagnetic interference.
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Electromagnetic compatibility (EMC) refers to the industrial PC's ability not to interfere with other devices and equipment through electromagnetic interference, and not to be disturbed by electrical or electromagnetic effects.
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 earthing is established via the ground connection between the threaded hole above the connection section and the central grounding point of the rack in which the PC is installed.
If you have ordered the industrial PC with a 24 V power supply unit, you can choose between two grounding points for functional earthing. Use either the threaded hole above the connection section or the grounding bolt in the sheet metal on the power supply unit. Again, make the ground connection to the central grounding point of the rack.
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.
