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.
Protective earth
The protective grounding of a device serves to avoid dangerous touch voltages. According to the EN 60204-1 standard (Chapter 8 Potential equalization), protective grounding is required if:
- the device exceeds dimensions of 50 mm x 50 mm,
- the device can be touched or encompassed over a large area,
- contact between the device and active parts is possible,
- an insulation fault may occur.
Establish the low-resistance protective grounding via the PE protective conductor connection on the housing of the industrial PC (see also chapter 3.1 Structure) and thus avoid dangerous touch voltages.
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) 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 earthing is also established via the earthing connection between the protective conductor connection on the device and the central grounding point of the control cabinet in which the PC is installed. Use wires with a cross-section of at least 4 mm2 or a flat conductor for the ground connection, as the circumference of the conductor should be as large as possible.
