Connection Procedure - Vega VEGASON 61 Operating Instructions Manual

VEGASON 61 • Four-wire 4 ... 20 mA/HART
With the Exd version, the minus side of the signal output is galvani-
cally connected to ground via protective diodes. When connecting the
instrument to a grounded PLC, equalising currents can flow in case
of potential differences which can cause malfunctions. Make sure
that there is sufficient potential equalisation from the system side or
realise the connection via switching amplifier.
5.2

Connection procedure

Proceed as follows:
1. Unscrew the housing lid
2. Loosen compression nut of the cable gland and remove blind
plug
3. Remove approx. 10 cm (4 in) of the cable mantle (current output),
strip approx. 1 cm (0.4 in) insulation from the ends of the indi-
vidual wires
4. Insert the cable into the sensor through the cable entry
5. Lift the opening levers of the terminals with a screwdriver
6. Insert the wire ends into the open terminals according to the wir-
ing plan
Fig. 17: Connection steps 5 and 6
7. Press down the opening levers of the terminals, you will hear the
terminal spring closing
8. Check the hold of the wires in the terminals by lightly pulling on
them
9. Connect the shielding to the internal ground terminal, connect the
external ground terminal to potential equalisation
10. Tighten the compression nut of the cable entry gland. The seal
ring must completely encircle the cable
5 Connecting to power supply
21