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 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:
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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SDL4 Converter User's manual V 2.01
