Vega VEGAPULS WL 61 Operating Instructions Manual

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Vega VEGAPULS WL 61 Operating Instructions Manual Manual pdf 26 page image

265 Connecting to power supplyVEGAPULS WL 61 • Two-wire 4 … 20 mA/HART38061-EN-1904045 Connecting to power supply5.1 Preparing the connectionAlways keep in mind the following safety instructions:• Carry out electrical connection by trained, qualified personnelauthorised by the plant operator• If overvoltage surges are expected, overvoltage arresters shouldbe installedWarning:Only connect or clamp in a de-energized state.Power supply and current signal are carried on the same two-wirecable. The operating voltage can differ depending on the instrumentversion.The data for power supply are specified in chapter "Technical data".Provide a reliable separation between the supply circuit and themains circuits according to DIN EN 61140 VDE 0140-1.Power the instrument via an energy-limited circuit acc. to IEC 61010-1, e.g. via Class 2 power supply unit.Keep in mind the following additional factors that influence the operat-ing voltage:• Lower output voltage of the power supply unit under nominal load(e.g. with a sensor current of 20.5 mA or 22 mA in case of fault)• Influence of additional instruments in the circuit (see load values inchapter "Technical data")The instrument is connected with standard two-wire cable. If electro-magnetic interference is expected which is above the test values ofEN 61326-1 for industrial areas, screened cable should be used.Screened cable generally necessary in HART multidrop mode.5.2 Wiring plan12Fig. 25: Wire assignment in permanently connected connection cable1 Brown (+) and blue (-) to power supply or to the processing system2 Shielding5.3 Switch-on phaseAfter connecting the instrument to voltage supply or after a voltagerecurrence, the instrument carries out a self-check for approx. 30 s:• Internal check of the electronicsSafety instructionsVoltage supplyConnection cableWire assignment, con-nection cable