Installation • Grounding concept
144
Power Panel 500 user's manual V1.40
4 Grounding concept
Functional ground is a current path of low impedance between electrical circuits and ground. It is used, for example,
to improve immunity to disturbances and not necessarily as a protective measure. It therefore serves only to deflect
disturbances, not to provide any kind of protection against electric shock.
This device comes equipped with two functional ground connections:
•
Power supply
•
Ground connection
To guarantee safe conductance of electric disturbances, 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 should be used. If a cable with wire end
sleeves is connected to the 0TB103.9 or 0TB103.91 terminal block, then a cable with maximum 1.5 mm²
per connection is possible.
•
Note the line shielding concept. All data cables connected to the device must be shielded.
Symbol indicating functional ground on the B&R device:
Control cabinet
Grounding strip
Power supply
Ground connection
Min. .5 mm
1
²
Min. 2.5 mm
²
Figure 71: Grounding concept
