VEGA VEGASON 54V…56V - Manual (Page 40)

40 VEGASON 54V … 56V
Shielding of the sensor cables
The "Electromagnetic pollution“ from elec-
tronic actuators, power lines and transmitting
stations is often so considerable that the
sensor cable should be shielded.
We recommend a screening on both ends.
Screening is a good preventative measure
against future sources of interference. How-
ever, you must make sure that no ground
potential currents flow through the sensor
cable shields. Ground potential currents can
be avoided by potential equalisation cables.
When grounding at both ends, it is possible
to connect the cable shield on one side (e.g.
in the switching cabinet) via a capacitor (e.g.
0.1 µF; 250 V) to the ground potential. Use a
low-resistance ground connection (founda-
tion, plate or mains earth).
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.
Electrical connection
Earthing on both ends (on the signal
conditioning instrument via potential
separation capacitor)
VEGAMET 515V
> 0,1µF
250 V AC
Earthing on one sensor side
VEGAMET 515V