Vega VEGAPULS 63 Operating Instructions Manual

Also see for VEGAPULS 63: Safety manual Quick setup guide Operating instructions Operating instructions Operating instructions

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Vega VEGAPULS 63 Operating Instructions Manual Manual pdf 19 page image

195 Connecting to power supplyVEGAPULS 63 • Profibus PA28446-EN-1506305 Connecting to power supply5.1 Preparing the connectionAlways keep in mind the following safety instructions:Warning:Connect only in the complete absence of line voltage.• The electrical connection must only be carried out by trainedpersonnel authorised by the plant operator.• If overvoltage surges are expected, overvoltage arresters shouldbe installed.The voltage supply is provided by a Profibus DP /PA segment coupler.The voltage supply range can differ depending on the instrumentversion. You can find the data for voltage supply in chapter "Technicaldata".Connection is made with screened cable according to the Profibusspecification. Power supply and digital bus signal are carried over thesame two-wire connection cable.Use cable with round cross section for instruments with housing andcable gland. To ensure the seal effect of the cable gland (IP protectionrating), find out which cable outer diameter the cable gland is suitablefor.Use a cable gland fitting the cable diameter.Please make sure that your installation is carried out according to theProfibus specification. In particular, make sure that the termination ofthe bus is done with appropriate terminating resistors.You can find detailed information of the cable specification, installa-tion and topology in the "Profibus PA - User and Installation Guide-line" on www.profibus.com.On the instrument with cable entry ½ NPT and plastic housing there isa metallic ½" threaded insert moulded into the plastic housing.Caution:No grease should be used when screwing the NPT cable gland orsteel tube into the threaded insert. Standard grease can containadditives that corrode the connection between threaded insert andhousing. This would influence the stability of the connection and thetightness of the housing.In systems with potential equalisation, connect the cable screendirectly to ground potential at the power supply unit, in the connectionbox and at the sensor. The screen in the sensor must be connecteddirectly to the internal ground terminal. The ground terminal outsideon the housing must be connected to the potential equalisation (lowimpedance).In systems without potential equalisation, connect the cable screendirectly to ground potential at the power supply unit and at the sensor.Safety instructionsVoltage supplyConnection cableCable gland ½ NPTCable screening andgrounding