SIMOVERT Master Drives Einspeise-Einheit Bauform B und C ...

02.96 Connection3.4 Measures for keeping to RFI suppression regulationsThe following points must be observed in order to comply with the radio-frequency interference suppressionrequirements:GroundingRadio frequency interference results from operation of the converters. Such interference voltages should bereturned to the source by means of low-resistance connections (cross-section of the ground connection cross-section of the power supply system connection).On installation of the power supply unit and of any optional RFI filters use should be made of the bestavailable method of grounding (e.g. mounting plate, earthing wire, earthing bus). Connect all conductivehousings together so as to make contact over a large area.Not only the cross-section (governed also by the safety regulations which should be observed to obviate theeffects of a fault) but also the contact surfaces are of vital importance for RFI suppression, since highfrequency interference currents do not flow through the entire cross-section but mainly on the outer surface ofthe conductor.ShieldingThe following measures are required in order to attenuate interference and to meet the RFI suppressionrequirementsuse of shielded cable between the output of the converter and the motor and use of shielded control cables.The shield must be connected to earth potential at both ends. FiltersThe RFI suppression filters must be connected directly before the power supply unit. The housings must beinterconnected by means of an electrically conductive connection.Type A1 RFI suppression filters are recommended for compliance with the RFI suppresssion requirements.Siemens AG 67087-6AC85-0AA0 ENGLISH 3-7Common Rectifier Operating instructions