VEGA VEGASCAN 850 - Manual (Page 54)

54 VEGASCAN 850
We recommend a screening on both ends,
see the following sketch. Screening is a good
preventative measure against future sources
of interference. However, you must make
sure that no ground potential currents flow
through the sensor cable shields. Ground
potential currents can be avoided by poten-
tial equalisation cables. When grounding at
both ends, it is possible to connect the cable
shield on one side (e.g. in the switching cabi-
net) via a capacitor (e.g. 0.1 µF; 250 V) to the
ground potential. Use a low-resistance
ground connection (foundation, plate or
mains earth).
Electrical connection
PC
on
BA
850
2
2
Linear (serial) arrangement of sensors
Grounding of the cable screen on both ends, at the end of each sensor line via a ground ca-
pacitor.
Note Ex protection!
In Ex applications, grounding on both ends is
not allowed due to potential losses. If an
instrument is used in hazardous areas, the
respective regulations, conformity certificates
and type approvals for systems in Ex areas
must be noted (e.g. DIN 0165).
Please note the approval documents with the
safety data sheet attached to the Ex sensors.