VEGA VEGADIS 12 - Manual (Page 12)

Take note of the corresponding installation regulations for Ex
applications.
If screened cable is necessary, connect the cable screen on
both ends to ground potential. In VEGABOX 01 or in
VEGADIS 12, the screen must be connected directly to the
internal ground terminal. The ground terminal outside on the
housing must be connected to the potential equalisation.
If potential equalisation currents are expected, the connection
on the processing side must be made via a ceramic capacitor
(e. g. 1 nF, 1500 V). The low frequency potential equalisation
currents are thus suppressed, but the protective effect against
high frequency interference signals remains.
In Ex applications, one-sided grounding on the sensor is
recommended, see EN 60079-14.
5.2 Connection procedure
Proceed as follows:
1 Unscrew the housing cover
2 Loosen compression nut of the cable entry
3 Remove approx. 10 cm of the cable mantle, strip approx.
1 cm insulation from the individual wires
4 Insert the cable into VEGADIS 12 through the cable entry
5 Loosen screw terminals with a screwdriver
6 Insert the wire ends into the open terminals according to
the wiring plan
7 Tighten screw terminals again
8 Check the hold of the wires in the terminals by lightly
pulling on them
9 Connect the screen to the ground terminal
10 Connect the ground terminal outside on the housing
according to specification (low impedance)
11 Tighten the compression nut of the cable entry. The seal
ring must completely encircle the cable
12 Screw the housing cover on
The electrical connection is finished.
Select connection
cable for Ex applica-
tions
Cable screening and ground-
ing
Cable screen and grounding
for Ex applications
12 VEGADIS 12
Connecting to power supply
20591
-EN
-071128