Commissioning
CP69xx
26
Version: 3.0
4.3.2
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.
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 low-resistance protective earth of the Control Panel via the voltage connection to avoid dangerous
touch voltages. There is a pin in the voltage socket for the protective earth (PE).
EMC
NOTE
Hardware damage due to electromagnetic interference
Using the Control Panel without functional earth can lead to hardware damage due to electromagnetic inter-
ference.
• Only use the device with functional earth.
Electromagnetic compatibility (EMC) of the Control Panel 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.
The Control Panel must comply with certain protection requirements. The Control Panel 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 rear side of the Control
Panel (see Fig. 15) and the central grounding point of the control cabinet in which the Panel is installed. Use
wires with a cross-section of at least 4 mm
2
or a flat conductor for the ground connection, as the
circumference of the conductor should be as large as possible.
Fig. 15: CP69xx_grounding bolt functional earthing
