Vega VEGAFLEX 86 4 … 20 mA_HART - four-wire Bedienungsanleitung PDF herunterladen (Seite 25)

5 Connecting to power supply

VEGAFLEX 86 • 4 … 20 mA/HART - four-wire

41845-EN-130314

suppressed, but the protective eect against high frequency interfer-

ence signals remains.

Warning:

Signicant potential dierences exist inside galvanization plants as

well as on vessels with cathodic corrosion protection. Considerable

equalisation currents can ow 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 metallic parts of the instrument (process tting, transmitter, con-

centric 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 nd specications on the potential connections inside the

instrument in chapter "Technical data".

5.2 Connection

The voltage supply and signal output are connected via the spring-

loaded terminals in the housing.

The connection to the display and adjustment module or to the inter-

face 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 a display and adjustment module is installed, remove it by turn-

ing 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

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