Connection Procedure - Vega VEGASON 61 Operating Instructions Manual

Connection cable
for Ex applications
VEGASON 61 • Profibus PA
supply unit and to the next distributor must be connected to each
other and also connected to ground potential 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.
The total capacitance of the cable and of all capacitors must not
exceed 10 nF in Ex applications.
Take note of the corresponding installation regulations for Ex applica-
tions. In particular, make sure that no potential equalisation currents
flow over the cable screen. In case of grounding on both sides this
can be achieved by the use of a capacitor or a separate potential
equalisation described above.
5.2

Connection procedure

Proceed as follows:
1. Unscrew the housing lid
2. If a display and adjustment module is installed, remove it by turn-
ing it to the left
3. Loosen compression nut of the cable gland and remove blind
plug
4. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
5. Insert the cable into the sensor through the cable entry
6. Lift the opening levers of the terminals with a screwdriver (see
following illustration)
7. Insert the wire ends into the open terminals according to the wir-
ing plan
Fig. 18: Connection steps 6 and 7
8. Press down the opening levers of the terminals, you will hear the
terminal spring closing
9. Check the hold of the wires in the terminals by lightly pulling on
them
10. Connect the shielding to the internal ground terminal, connect the
external ground terminal to potential equalisation
11. Tighten the compression nut of the cable entry gland. The seal
ring must completely encircle the cable
5 Connecting to power supply
23