ABB RINT-5411 Redundant channel module
The metal bottom of RINT-5411 connects to the metallic DIN-rail which serves as the Tension Electronics earth connector. This is to ensure a good earth connection both for internal logic and for the EMI immunity and 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, for instance, yellow chromium treated. Use star washers with each screw used to fasten the DIN-rail to the mounting plate. To fasten the DIN-rail onto the mounting plate, the minimum screw diameter is 5 mm and the 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 power and signal conductors must be twisted separately • The external protective earth (PE) cable must be attached to one of the earthbar screw clamps. • All the cable screens have to be connected to the earthbar and the length of the screen connection must be less than 50 mm (2 in.).
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