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5 Connecting to power supply

POINTRAC 31 • Probus PA

43835-EN-131119

directly to the internal ground terminal. The ground terminal outside

on the housing must be connected to the potential equalisation (low

impedance).

In systems without potential equalisation with cable screening on

both sides, 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). Low-frequency potential equali-

sation currents are thus suppressed, but the protective eect against

high frequency interference signals remains.

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.

Proceed as follows:

The procedure applies to instruments without explosion protection.

1. Unscrew the big housing cover

2. Loosen compression nut of the cable entry

3. 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

4. Insert the cable into the sensor through the cable entry

Connection technology

Connection procedure

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Vega POINTRAC 31 Profibus PA Bedienungsanleitung Seite 17