Vega VEGAPULS 63 Operating Instructions Manual

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

Vega VEGAPULS 63 Operating Instructions Manual Manual pdf 22 page image

Use cable with round cross-section. A cable outer diameter of5 … 9 mm (0.2 … 0.35 in) ensures the seal effect of the cablegland. If you are using cable with other diameter or cross-section, you have to exchange the seal or use a suitable cablegland.If screened cable is necessary, connect the cable screen onboth ends to ground potential. In the sensor, the screen mustbe connected directly to the internal ground terminal. Theground terminal on the outside of the housing must beconnected to the potential equalisation (low impedance).If potential equalisation currents are expected, the connectionon the processing side must be made via a ceramic capacitor(e. g. 1 nF, 1500 V). The low frequency potential equalisationcurrents are thus suppressed, but the protective effect againsthigh frequency interference signals remains.Take note of the corresponding installation regulations for Exapplications. In particular, make sure that no potential equal-isation currents flow over the cable screen. In case ofgrounding on both sides this can be achieved by the use of acapacitor or a separate potential equalisation.With the Exd version, the minus side of the signal output isgalvanically connected to ground via protective diodes. Whenconnecting the instrument to a grounded PLC, equalisingcurrents can flow in case of potential differences which cancause malfunctions. Make sure that there is sufficient potentialequalisation from the system side or realise the connection viaswitching amplifier.5.2 Connection procedureProceed as follows:1 Unscrew the housing cover2 If an indicating and adjustment module is installed, removeit by turning it slightly to the left.3 Loosen compression nut of the cable entry4 Remove approx. 10 cm (4 in) of the cable mantle, stripapprox. 1 cm (0.4 in) insulation from the ends of theindividual wires5 Insert the cable through the cable gland into the sensor6 Lift the opening levers of the terminals with a screwdriver(see following illustration)Cable screening andgroundingInstallation withEx applications22 VEGAPULS 63 • 4 … 20 mA/HART - four-wire5 Connecting to power supply28441-EN-080826