Commissioning • Connecting to the power grid
Chapter 3
Commissioning
Automation PC 3100 user's manual V0.60
105
2.2 Connecting the power supply to a B&R device
Danger!
The power supply to the B&R device must be completely interrupted. Before connecting the power
cable, it is necessary to check whether it has been disconnected from the power source (e.g. power
supply).
1. Discharge any electrostatic charge on the housing or ground connection.
2. Connect the power supply connector to the B&R device and tighten the mounting screws (max. tightening
torque 0.5 Nm).
Figure 23: Connecting the power supply connector to a B&R device
2.3 Grounding concept - Functional ground
Functional ground is a current path of low impedance between electrical circuits and ground. It is used to improve
immunity to interference, for example, and not necessarily as a protective measure. It therefore serves only to
conduct interference, not to provide any kind of protection against electric shock.
This device comes equipped with 2 functional ground connections:
•
Power supply
•
Ground connection
To ensure the safe conductance of electrical interference, 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 must be used. If a cable with wire end
sleeves is connected to terminal block 0TB103.9 or 0TB103.91, then a cable with maximum 1.5 mm² per
connection is possible.
•
Observe the line shielding concept. All data cables connected to the device must be shielded.
The following symbol is used to indicate functional ground on the B&R device:
Control cabinet
Grounding rail
Power supply
Ground connection
Min. 2.5 mm
²
Min. 1.5 mm
²
