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5 Connecting to power supply
VEGACAL 66 • Foundation Fieldbus
30038-EN-200929
In systems with potential equalisation, connect the cable screening
directly to ground potential at the power supply unit, in the connection
box and at the sensor. The screen in the sensor must be connected
directly to the internal ground terminal. The ground terminal outside
on the housing must be connected to the potential equalisation (low
impedance).
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. 8: 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
12. Screw the housing lid back on
The electrical connection is finished.
5.3 Wiring plan, single chamber housing
The following illustrations apply to the non-Ex as well as to the Ex-ia
version.
