Operation Manual - ASSMANN IT-Solutions AG

3.1 The Principles of Operation3 - Functional ExplanationThe UPS stores electric energy in batteries. This allows the UPS to supply output power even when theincoming utility power is cut off completely.Energy is stored as Direct Current (DC), while input and output energy must be Alternating Current (AC).Therefore the UPS contains an input converter (AC to DC) and an output converter (DC to AC). (fig.2)3.2 Normal ConditionsUnder normal conditions, energy from the utility is channelled through the input converter, which supplies theoutput converter and the battery charger. The batteries are kept in a fully charged state, and the outputconverter synthesizes a completely new AC output sine wave to supply the load (electrical equipment).INPUT:MAINS POWER WITH DISTURBANCESOUTPUT:PERFECT UPS POWERMANUAL BYPASS SWITCH1-PHASEMAINS INPUTBYPASSFILTERRFIFILTERTO LOADRFIFILTERINPUTCONVERTER/BATTERYCHARGEROUTPUTCONVERTERAUTOMATICBYPASSSWITCHOPTIONSLOTS FOR:RPA CARDSNMP CARDOPTIONALRELAY CARDBATTERYEXTENSIONBATTERYMICROPROCESSOR CONTROLSYSTEMON/OFFFRONTPANELSTANDARDINSTALLED:RS232/CONTACTINTERFACE3.3 Utility FailureFigure 2. Block diagram of the LP 11 UPS, mains presentIn the event of a utility power failure (i.e. absent or outside tolerance) the system uses the energy reservestored in the battery to continue to produce AC power, ensuring unbroken output (fig. 3). No interruption oralteration will ever be noticed in the output power.In the event of an extended utility failure, the output converter will stop when the battery has been discharged.At this point, the UPS is no longer able to power the connected equipment.When the utility is re-established within tolerance, the output converter will restart automatically (if stopped, seeabove) and will be supplied again by the input converter. The batteries will be recharged, making them ready tosupport future power failures.NO INPUT:MAINS FAILURE (BLACK OUT)OUTPUT:PERFECT UPS POWERMANUAL BYPASS SWITCHBYPASSFILTERRFIFILTERTO LOADRFIFILTERINPUTCONVERTER/BATTERYCHARGEROUTPUTCONVERTERAUTOMATICBYPASSSWITCHOPTIONSLOTS FOR:RPA CARDSNMP CARDOPTIONALRELAY CARDBATTERYEXTENSIONBATTERYMICROPROCESSOR CONTROLSYSTEMON/OFFFRONTPANELSTANDARDINSTALLED:RS232/CONTACTINTERFACEFigure 3. Block diagram of the LP 11 UPS, utility failureOPM_LPE_11X_3K0_10K_1GB_V041 6 GE DE LP 11 UPS: User manual 4.1 (GB)