Siemens SITRANS LG240 Operating Instructions Manual

Also see for SITRANS LG240: Operating instructions Operating instructions

20 PBD-51041044SITRANS LG240 - Operating Instructions44576-EN-200212On 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".Make sure that the cable screen and grounding are carried out ac-cording to Fieldbus specification. We recommend to connect thecable screening to ground potential on both ends.In systems with potential equalisation, connect the cable screeningdirectly 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).5.2 ConnectingThe 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 entry1 2Fig. 10: Connection steps 5 and 61 Single chamber housing2 Double chamber housing6. Insert the wire ends into the terminals according to the wiring planCable screening andgroundingConnection technologyConnection procedure