ABB PFEA111

The cabling between the load cells and the electronic unit and electrical connections must becarefully carried out in accordance with connection diagram 3BSE028140D0065 (See theappendix for your type of load cell) or according to order-specific documentation.

The metal bottom of PFEA111-20 and PFEA112-20 connects to the metallic DIN-rail whichserves as the Tension Electronics earth connector.This is to ensure a good earth connection both for internal logic and for the EMI immunityand RF emission of the electronics.The DIN-rail must have a good connection to the PE (Protective Earth) of the cabinet.To achieve the best possible corrosion resistance, DIN-rails should be chromium plated, forinstance, yellow chromium treated. Use star washers with each screw used to fasten theDIN-rail to the mounting plate.To fasten the DIN-rail onto the mounting plate, the minimum screw diameter is 5 mm andthe maximum distance between screws is 100 mm

For trouble free operation, the earthing must be carried out carefully. Note the following:•If the free (unscreened) length exceeds 0.1 m (4 in.) the individual pairs of powerand signal conductors must be twisted separately•The external protective earth (PE) cable must be attached to one of the earthbar screwclamps.•All the cable screens have to be connected to the earth bar and the length of the screenconnection must be less than 50 mm (2 in.).The cable screens must be earthed at one end only.•Since the signal earth of the measurement system is connected to the chassis earth of thetension electronics, the input of a superior system connected to the control system must notbe earthed. The best ways of interconnecting the

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