Vega VEGAMET 624 Operating Instructions Manual
Also see for VEGAMET 624: Supplementary instructionsOperating instructionsSupplementary instructions manualOperating instructions
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Contents
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5 Connecting to power supply5.1 Preparing the connectionAlways keep in mind the following safety instructions:l Connect only in the complete absence of line voltagel If overvoltages are expected, install overvoltage arrestersIn hazardous areas you should take note of the appropriateregulations, conformity and type approval certificates of the sensorsand power supply units.The voltage supply can be 20 … 253 V AC/DC, 50/60 Hz.The operating voltage of VEGAMET 624 is connected with standardcable according to the national installation standards.Standard two-wire cable can be used for connecting the sensors. Thescreening is absolutely necessary to ensure interference-free oper-ation with HART sensors.Connect the cable screen on both ends to ground potential. In thesensor, the screen must be connected directly to the internal groundterminal. The ground terminal on the outside of the sensor housingmust be connected to the potential equalisation (low impedance).If potential equalisation currents are expected, the screen connectionon the side of VEGAMET 624 must be made via a ceramic capacitor(e. g. 1 nF, 1500 V). The low frequency potential equalisation currentsare thus suppressed, but the protective effect against high frequencyinterference 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.5.2 Connection procedureMove on to electrical connection and proceed as follows:1 Snap the socket without VEGAMET 624 onto the carrier rail2 Connect sensor cable to terminal 1/2 (active input) or 3/4 (passiveinput), provide a screening3 When using several sockets, loop the power supply by means ofbridges4 Connect power supply (switched off) to terminal 17 and 185 If necessary, connect relays or other outputsNote safety instructionsTake note of sa-fety instructionsfor Ex applica-tionsSelect power supplySelecting connectioncableCable screening andgroundingSelect connec-tion cable for Exapplications12 VEGAMET 624 • 4 … 20 mA/HART signal conditioning instrument5 Connecting to power supply28969-EN-091116 |
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