Electrical connection
Proline 200 FOUNDATION Fieldbus
14
Hauser
2. For reasons concerning explosion protection, it is recommended that grounding be
dispensed with.
To comply with both requirements, there are basically three different types of shielding in the
fieldbus system:
• Shielding at both ends
• Shielding at one end on the feed side with capacitance termination at the field device
• Shielding at one end on the feed side
Experience shows that the best results with regard to EMC are achieved in most cases in
installations with one-sided shielding on the feed side (without capacitance termination at
the field device). Appropriate measures with regard to input wiring must be taken to allow
unrestricted operation when EMC interference is present. These measures have been taken
into account for this device. Operation in the event of disturbance variables as per NAMUR
NE21 is thus guaranteed.
1. Observe national installation requirements and guidelines during installation.
2. Where there are large differences in potential between the individual grounding points,
connect only one point of the shielding directly to the reference ground.
3. In systems without potential equalization,
the cable shielding of fieldbus systems should be grounded on one side only, 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.
