Vega VEGAPULS 62 Operating Instructions Manual

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Vega VEGAPULS 62 Operating Instructions Manual Manual pdf 27 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.Warning:Within galvanic plants as well as vessels with cathodic corrosionprotection there are considerable potential differences. Considerablyequalisation currents can be caused via the cable scrren when thescreen is earthed on both ends. To avoid this, the cable screen mustonly connected to ground potential on one side of the switchingcabinet in such applications. The cable screen must not be connectedto the internal ground terminal in the sensor and the outer groundterminal on the housing not to the potential equalisation!Information:The metal parts of the instrument (antenna, transmitter, concentrictube, etc.) are conductive connected with the inner and outer groundterminal on the housing. This connection exists either directly metallicor with instruments with external electronics via the screen of thespecial connection cable. You can find specifications to the potentialconnections within the instrument in chapter "Technical data".5.2 ConnectionThe connection of the voltage supply and the signal output is carriedout via the spring-loaded terminals in the housing.The connection to the indicating and adjustment module or to theinterface adapter is carried out via contact pins in the housing.Proceed as follows:1 Unscrew the housing cover2 If an indicating and adjustment module is installed, remove it byturning it slightly to the left.3 Loosen compression nut of the cable entry4 Remove approx. 10 cm (4 in) of the cable mantle, strip approx.1 cm (0.4 in) of insulation from the ends of the individual wiresCable screening andgroundingConnection technologyConnection procedure26 VEGAPULS 62 • 4 … 20 mA/HART two-wire5 Connecting to power supply36503-EN-100607