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 20 page image

If screened cable is necessary, connect the cable screen on both endsto ground potential. In the sensor, the screen must be connecteddirectly to the internal ground terminal. The ground terminal on theoutside of the housing must be connected to the potential equalisation(low impedance).If potential equalisation currents are expected, the connection on theprocessing side must be made via a ceramic capacitor (e. g. 1 nF,1500 V). The low frequency potential equalisation currents are thussuppressed, but the protective effect against high frequency interfer-ence signals remains.Take note of the corresponding installation regulations for Exapplications. In particular, make sure that no potential equalisationcurrents flow over the cable screen. In case of grounding on both sidesthis can be achieved by the use of a capacitor or a separate potentialequalisation.With the Exd version, the minus side of the signal output is galvanicallyconnected to ground via protective diodes. When connecting theinstrument to a grounded PLC, equalising currents can flow in case ofpotential differences which can cause malfunctions. Make sure thatthere is sufficient potential equalisation from the system side or realisethe connection via switching amplifier.5.2 Connection procedureProceed as follows:1 Unscrew the housing cover2 Loosen compression nut of the cable entry3 Remove approx. 10 cm (4 in) of the cable mantle (current output),strip approx. 1 cm (0.4 in) insulation from the ends of the individualwires4 Insert the cable through the cable gland into the sensor5 Lift the opening levers of the terminals with a screwdriver6 Insert the wire ends into the open terminals according to the wiringplan7 Press down the opening levers of the terminals, you will hear theterminal spring closing8 Check the hold of the wires in the terminals by lightly pulling onthem9 Connect the screen to the internal ground terminal, connect theouter ground terminal with potential equalisation10 Tighten the compression nut of the cable entry. The seal ring mustcompletely encircle the cable11 Connect the lead cable for power supply in the same wayaccording to the wiring plan, in addition connect the groundconductor to the inner ground terminal.Cable screening andgroundingInstallation withEx applications20 VEGASON 61 • 4 … 20 mA/HART four-wire5 Connecting to power supply28778-EN-081127