User Manual - Infosec

Fig.13. Block diagram for the “Backfeed protection” application, for three phase input / three phase output configuration.Mains three phase:Connect the power supply cables N-R-S-T to the input terminals (X4), (X1), (X2) and (X3), adhering to theorder of neutral and phases indicated on the label of the device and in this manual. If the order of thephases is not adhered to, the device will not operate.When there are discrepancies between the labelling and the instructions of this manual, the label will alwaysprevail.Independent static bypass line connection, terminals4.3.2 Independent static bypass line connection, terminals (X14 to X17). With dual input.As this is a device with class I protection against electric shocks, it is essential to install a protectiveearth conductor (earth connection ( )). Connect the conductor to the terminal (X5), before connecting thepower supply to the UPS input.In accordance with safety standard EN-IEC 62040-1, the installation has to be provided with a “Backfeedprotection” system, such as a contactor, which will prevent the appearance of voltage or dangerous energyin the input mains during a mains fault (see figure 13).There can be no bypass in the line that goes from the “Backfeed protection” to the UPS, as this wouldinfringe on standard safety requirements.Warning labels should be placed on all primary power switches installed in places that are not in the vicinityof the device to alert the electrical maintenance personnel of the presence of a UPS in the circuit.The label will bear the following or an equivalent text:Before working on this circuit.- Isolate the Uninterruptible Power Supply (UPS).- Then check for Hazardous Voltage between all terminals including the protective earth.Risk of Voltage Backfeed.Connect the static bypass line cables to the respective terminals according to the configuration of theavailable equipment.18INFOSEC UPS SYSTEM - 4, rue de la Rigotière - 44700 Orvault - FRANCE - www.infosec-ups.comHot Line – Tel + 33 (0)2 40 76 15 82 - Fax + 33 (0)2 40 94 29 51 - hotline@infosec.fr – 06 11 AA 59 201 02