Vega VEGASON 61 Operating Instructions Manual

Also see for VEGASON 61: Quick setup guide Operating instructions Operating instructions Operating instructions Operating instructions

Contents

Vega VEGASON 61 Operating Instructions Manual Manual pdf 22 page image

In systems without potential equalisation, connect the cablescreen directly to ground potential at the power supply unit andat the sensor. In the connection box or T-distributor, the screenof the short stub to the sensor must not be connected toground potential or to another cable screen. The cable screensto the power supply unit and to the next distributor must beconnected to each other and also connected to groundpotential via a ceramic capacitor (e.g. 1 nF, 1500 V). The lowfrequency potential equalisation currents are thus suppressed,but the protective effect against high frequency interferencesignals remains.The total capacitance of the cable and of all capacitors mustnot exceed 10 nF in Ex applications.Take note of the corresponding installation regulations for Exapplications. In particular, make sure that no potential equal-isation currents flow over the cable screen. In case ofgrounding on both sides this can be achieved by the use of acapacitor or a separate potential equalisation.5.2 Connection steps - Instrument housingProceed as follows:1 Unscrew the housing cover2 If an indicating and adjustment module is installed, removeit by turning it slightly to the left.3 Loosen compression nut of the cable entry4 Remove approx. 10 cm (4 in) of the cable mantle, stripapprox. 1 cm (0.4 in) insulation from the ends of theindividual wires5 Insert the cable into the sensor through the cable entry6 Lift the opening levers of the terminals with a screwdriver(see following illustration)7 Insert the wire ends into the open terminals according tothe wiring planSelect connectioncable for Ex applica-tions22 VEGASON 61 - Foundation FieldbusConnecting to power supply28790-EN-070507