APC BK250EI, BK400EI, BK600EI user manual 2Loadtransferswitch, 3BatteryCharger, 4Battery, 5Inverter

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4.2Loadtransferswitch

The load transfer switch is actually an electro-dynamic relay which serves to rapidly transfer your computer equipment (load) from the utility to the UPS’s alternate power source in the event of a utility failure. When the utility is restored to within safe limits, the switch acts to re-transfer the load to the utility. The time required for the relay to transfer your load to either power source is much, much faster than that which is required by any modern computer or computer peripheral device.

4.3BatteryCharger

The UPS's battery charger converts the alternating current (AC) supplied by the utility to a direct current (DC) which is compatible with the battery. The charger maintains the battery at a constant voltage to ensure that the battery will have the capacity to support your load as often as possible. This charging method, known as “float” charging, provides maximum battery service life and minimal internal heating. The battery is charged whenever the UPS is plugged in, whether or not it is switched on.

4.4Battery

The UPS’s battery is an energy source much like the battery in an automobile. Also, like most automobile batteries, the UPS’s battery is a modern maintenance free lead-acid type; it is sealed and leakproof. The battery has a typical service life of 3 to 6 years. The service life is extended when the UPS is kept in a cool environment, below 30°C or 86°F.

4.5Inverter

The UPS must convert the battery’s energy into a form that your computer equipment can rely upon during a utility failure. This is the job of the UPS’s inverter. The UPS converts the battery’s DC to AC using solid state devices (transistors), controlled using a technique known technically as “pulse width modulation”. This technique is highly efficient which means that little battery power is wasted in the conversion process. Hence, your equipment can run for long periods from the UPS before the battery’s capacity is spent.

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Contents APC Back-UPS Pleasesaveorrecyclethepackagingmaterials ImportantSafetyInstructionsPleasesavethismanual TableofContents 3Optionswitches 2Userreplaceablebattery0Introduction 1Overview6Remoteinterface Test / Alarm Disable switch5SurgesuppressionandEMI/RFIfiltering 0Safety 0Sécurité!Françias Vorsicht 0Sicherheit!Deutsch¡Atencion ¡Seguridad!Español2Placement 0Installation1Receivinginspection 3Loadtypes5Batterycharging 4ConnectingtotheUtilityConnecting Your Equipment to the UPS Example labels found at system equipment rear panels 8Overloads Test for Proper Operation0PrinciplesofOperation Noise and surge suppression 3BatteryCharger 2Loadtransferswitch4Battery 5Inverter8Operationduringautilityfailure 6TransformerMonitoring and control electronics Page Power I/0 switch ControlsandindicatorsTest/Alarm Disable switch on units so equipped 3AudiblealarmOption Switch #2 and #3 4OptionSwitchesOption Switch #1 Option Switch #4 Option Switch #2 Switch #3 Undervoltage Transfer0UPSmonitoring 2PowerChuteSoftware600VAonlyPage 0Difficulty Françias 0Difficulté0SchwierigkeitDeutsch ¡Cuidado 0Dificultad EspañolMo r 1TroubleshootingChart1TroubleshootingChart 2ReplacingtheBattery 3ObtainingService 2ExtendedStorage StoringtheUPSStorageConditions 0RunTimeVersusLoad 10.2TransferCharacteristics Specifications10.3OutputCharacteristics 10.4BatteryandchargerSurge and noise suppression 10.6OperatingenvironmentandphysicaldimensionsDeclaration of Conformity LimitedWarranty Page Serial number