VEGA VEGAPULS 66 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - four-wire - Manual (Page 24)

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5 Connecting to power supply
VEGAPULS 66 • 4 … 20 mA/HART - four-wire
36520-EN-121011
Warning:
Significant potential differences exist inside galvanization plants as
well as on vessels with cathodic corrosion protection. Considerable
equalisation currents can flow over the cable screen if the screen is
grounded on both ends.
To avoid this in such applications, the cable screen must be connect-
ed to ground potential only at one end (in the switching cabinet). The
cable screen must not be connected to the internal ground terminal in
the sensor and the outer ground terminal on the housing must not be
connected to the potential equalisation!
Information:
The metal parts of the instrument (process fitting, transmitter, concen-
tric tube, etc.) are conductively connected with the inner and outer
ground terminal on the housing. This connection exists either directly
via connecting metallic parts or, in case of instruments with external
electronics, via the screen of the special connection cable.
You can find specifications on the potential connections inside the
instrument in chapter "Technical data".
5.2 Connecting
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
The connection to the indicating and adjustment module or to the
interface adapter is carried out via contact pins in the housing.
Information:
The terminal block is pluggable and can be removed from the elec-
tronics. To do this, lift the terminal block with a small screwdriver and
pull it out. When inserting the terminal block again, you should hear it
snap in.
Proceed as follows:
1. Unscrew the housing cover
2. If an indicating and adjustment module is installed, remove it by
turning it slightly to the left.
3. Loosen compression nut of the cable entry
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
Connection technology
Connection procedure