Grounding Concept - Functional Ground - B&R Automation PC 3100 User Manual

Commissioning

3.2.3 Grounding concept - Functional ground

Functional ground is a current path of low impedance between circuits and ground. It is used to improve immunity
to interference, for example, and not as a protective measure. It serves only to divert interference, not to protect
against contact with persons.
The device is equipped with 2 functional ground connections:
• Functional ground connection of the power supply
• Ground connection
The following points must be observed to ensure that electrical interference is safely diverted:
• Connect the device to the central grounding point (e.g. the control cabinet or the system) using the shortest
possible low-resistance path.
• Cable design with at least 2.5 mm² per connection. If a cable with wire end sleeve is used at terminal block
0TB103.9 or 0TB103.91, a cable with a maximum of 1.5 mm² per connection is possible.
• Observe the shielding concept of the conductors. All data cables connected to the device must be shielded.
The functional ground on the B&R device is marked with the following symbol:
Ground connection
Power supply connection
+24 VDC (pin 2)
126
Figure 24: Automation PC 3100 - Grounding concept
Automation PC 3100 User's manual V 1.00 Translation of the original documentation
Min. 1.5 mm² Min. 2.5 mm²
Central grounding point