Wiring RIA15
30 Endress+Hauser
therefore, cable shielding of fieldbus systems should only be grounded on one side, for
example at the supply unit or at safety barriers.
NOTICE
If the shielding of the cable is grounded at more than one point in systems without
potential matching, power supply frequency equalizing currents can occur that
damage the signal cable or have a serious effect on signal transmission.
‣
In such cases the shielding of the signal cable is to be grounded on one side only, i.e. it
must not be connected to the ground terminal of the housing. The shield that is not
connected should be insulated!
6.7 Connecting to functional grounding
6.7.1 Panel-mounted device
For EMC reasons, the functional grounding should always be connected. When the device
is used in the hazardous area (with optional Ex approval) the connection is obligatory.
A0018894
12 Functional grounding terminal on panel-mounted device
6.7.2 Field device
For EMC reasons, the functional grounding should always be connected. When used in the
hazardous area (with optional Ex approval), the connection is obligatory and the field
housing must be grounded via a grounding screw fitted on the outside of the housing.
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