Installation and wiring
5.4.3 Grounding concept - Functional ground
Functional ground is a low impedance current path between circuits and ground. It is used for equipotential bonding
and thus for improving immunity to interference.
Notice!
Functional grounding does not meet the requirements of protective ground!
Suitable measures for electrical safety in the event of operation and faults must be provided separately.
The device is equipped with the following functional ground connections:
•
Functional ground connection of the power supply
•
Ground connection
The functional ground on the B&R device is marked with the following symbol:
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.
Legend
1
Ground connection
2
Power supply conn24 VDC pin 2
3
Central grounding point
a
At least 1.5 mm²
b
At least 2.5 mm²
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Automation Panel 9x3 User's manual 2.01
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