Endress+Hauser Proline Promag W 400 - Page 26

Electrical connection Proline Promag W 400
26 Endress+Hauser
Where there are large differences in potential between the individual grounding points, only
one point of the shielding is connected directly with the reference ground. In systems without
potential equalization, therefore, cable shielding of fieldbus systems should only be grounded
on one side, for example at the fieldbus supply unit or at safety barriers.
NOTICE
In systems without potential matching, the multiple grounding of the cable shield causes
mains frequency equalizing currents!
Damage to the bus cable shield.
‣
Only ground the bus cable shield to either the local ground or the protective ground at one
end. Insulate the shield that is not connected.
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A0019004
1 Controller (e.g. PLC)
2 Segment coupler PROFIBUS DP/PA
3 Cable shield
4 T-box
5 Measuring device
6 Local grounding
7 Bus terminator
8 Potential matching line