Grounding Concept - Functional Ground - B&R Automation Panel 9 D Series User Manual

Installation and wiring

5.4.3 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 the following 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:
The connection must be made via the respective interfaces of the used link module or Panel PC. The following
figure shows the connection diagram using a PPC2200.
1
Ground connection
a At least 1.5 mm²
104
Legend
Power supply connection +24 VDC pin 2
2
b At least 2.5 mm²
Automation Panel 9xD - Hygienic design User's manual V 1.80
3 Central grounding point
-