Grounding the control panel
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 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.
The control panel connections feature a protective conductor connection (PE), which must be used to establish the low-resistance protective earthing and functional earthing of the panel. If the device is equipped with a connection block, the protective conductor connection is located directly next to the connections. For a device with a Beckhoff mounting arm adapter, the connection is located in the connection compartment (see Fig. 27).
Fig.26: Protective conductor connection PEEMC
Notice | |
Hardware damage due to electromagnetic interference The use of the device without a functional earth can lead to material damage due to electromagnetic interference.
|
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. Functional earth is also established via the PE protective conductor connection in the connection section of the control panel. 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.