B&R MAPPC700A-ENG, User Manual

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Commissioning • Grounding concept
Panel PC 700 with 945GME N270 CPU board User's Manual V 1.16
3. Grounding concept
Functional ground is a current path of low impedance between electrical circuits and ground. It
is used, for example, to improve immunity to disturbances and not necessarily as a protective
measure. It therefore serves only to deflect disturbances, not to provide any kind of protection
against electric shock.
This device comes equipped with two functional ground connections:
• Supply voltage
• Ground connection
To guarantee safe conductance of electric disturbances, the following points must be observed:
• The device must be connected to the central grounding point in the control cabinet using
the shortest route possible.
• A cable with a minimum cross section of 2.5 mm² per connection should be used. If a
cable with wire end sleeves is connected to the 0TB103.9 or 0TB103.91 terminal block,
then a cable with maximum 1.5 mm² per connection is possible.
• Note the line shielding concept. All data cables connected to the device must be shielded.
Symbol indicating functional ground on the B&R device:
Figure 122: Grounding concept
Switchin g cabinet
Groundin g strip
Supply volta g e
Ground connection
min. 1.5mm²
min. 2.5mm²