Grounding The Panel Pc; Fig. 15 Protective Conductor Connection Pe - Beckhoff CP6706-0001 Manual

Commissioning
4.3.1

Grounding the panel PC

Grounding or potential equalization of electronic devices minimizes potential differences and conducts
electrical currents to ground. 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 earthing via the protective conductor connection PE on the rear of the
housing to avoid dangerous touch voltages.
Fig. 15: Protective conductor connection PE
EMC
Hardware damage due to electromagnetic interference
The use of the device without a functional earth can lead to material damage due to electromagnetic
interference.
• Only use the device with functional earth.
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. It 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 also established via the
protective conductor connection PE on the rear of the housing (see Fig. 15). Use cables with a minimum
2
cross-section of 4 mm for the ground connection.
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NOTICE
Version: 2.0 CP6706-0001