Grounding The Control Panel; Fig. 27 Cp39Xx_Protective Conductor Connection Pe - Beckhoff CP39 Series Manual

4.3.1

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 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. 27: CP39xx_Protective conductor connection PE
Use cables with a cross-section of at least 4 mm
Protective earth
By connecting the PE (protective earth), you establish the low-resistance protective earthing of the control
panel and thus avoid dangerous touch voltages.
EMC
Hardware damage due to electromagnetic interference
Using the control panel without functional earth can lead to hardware damage due to electromagnetic
interference.
• 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. Functional earth is also established via the PE
protective conductor connection in the connection section of the control panel.
CP39xx
2
to connect the protective conductor.
NOTE
Version: 3.6
Commissioning
35