Vega VEGABAR 64 Foundation Fieldbus Bedienungsanleitung PDF herunterladen (Seite 17)

In systems without potential equalisation, connect

the cable screen

directly to ground potential at the power supply unit and at the sensor.

In the connection box or T-distributor, the screen of the short stub to

the sensor must not be connected to ground potential or to another

cable screen. The cable screens to the power 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

appl

ications. 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.

5.2 Connection procedure

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 of the cable mantle, strip approx. 1 cm

insulation from the individual wires

5 Insert the cable through the cable gland into the sensor

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 wiring

plan

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 screen to the internal ground terminal, connect the

outer ground terminal with potential equalisation

11 Tighten the compression nut of the cable entry. The seal ring must

completely encircle the cable

12 Screw the housing cover on

Select connec-

tion cable for Ex

applications

Single/Double chamber

housing

VEGABAR 64 • Foundation Fieldbu

s 17

5 Connecting to power supply

28259-EN-081209

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