Vega VEGADIS 82 Operating Instructions Manual

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Vega VEGADIS 82 Operating Instructions Manual Manual pdf 16 page image

165 Connecting to power supplyVEGADIS 82 • 4 … 20 mA/HART45300-EN-170724NPT threadIn the case of instrument housings with self-sealing NPT threads, it isnot possible to have the cable entries screwed in at the factory. Thefree openings for the cable glands are therefore covered with red dustprotection caps as transport protection.Prior to setup you have to replace these protective caps with ap-proved cable glands or close the openings with suitable blind plugs.On plastic housings, the NPT cable gland or the Conduit steel tubemust be screwed into the threaded insert without grease.Max. torque for all housings, see chapter "Technical data".If screened cable is necessary, we recommend connecting the cablescreen on both ends to ground potential. In the VEGADIS 82, thescreen should be connected directly to the internal ground terminal.In Ex systems it must be ensured that the grounding complies with theinstallation regulations.In electroplating plants as well as plants for cathodic corrosion protec-tion it must be taken into account that significant potential differencesexist. This can lead to unacceptably high currents in the cable screenif it is grounded at both ends.5.2 Connection technology and stepsThe voltage supply and signal output are connected via the spring-loaded terminals in the housing.Connection to the display and adjustment module or to the interfaceadapter is carried out via contact pins in the housing.Information:The terminal block is pluggable and can be removed from theelectronics. To do this, lift the terminal block with a small screwdriverand pull it out. When reinserting the terminal block, you should hear itsnap in.Proceed as follows:1. Unscrew the housing lid2. If a display and adjustment module is installed, remove it by turn-ing it slightly to the left3. Loosen compression nut of the cable gland and remove blindplug4. 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 wires5. Insert the cable into the sensor through the cable entryCable screening andgroundingConnection technologyConnection procedure