APC BK400EI, BK600EI, BK250EI user manual 4OptionSwitches, Option Switch #1, Option Switch #2 and #3

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sound a loud tone 2 minutes in advance of shut down due to battery capacity exhaustion. Once shut down, the UPS will return to the periodic beep. The UPS should be turned off at this point to cease the alarm. In the event the UPS encounters a severe overload, the UPS will shut down and emit a loud tone. The alarm is reset when the UPS is turned off.

5.4OptionSwitches

The option switches are located on the rear panel and are set to the down (off) position as supplied from the factory.

5.4.1 Option Switch #1

When option switch #1 is set to the up (on) position in advance of a utility failure, the UPS’s audible utility failure alarm is defeated. When the switch is set to the down position (this is the factory setting), the UPS beeps once every five seconds when the utility voltage has fallen outside acceptable limits. Regardless of the position of this control, the UPS will still sound a loud tone during the low battery conditions. This feature is convenient where brief power interruptions are common and the audible alarm becomes an annoyance.

5.4.2 Option Switch #2 and #3

Option switches #2 and #3 adjust the utility voltage at which the UPS will transfer your computer equipment to the UPS’s alternate power source. Adjustment of the “transfer voltage” is desirable where frequent line voltage excursions or line voltage distortion cause the UPS to transfer many times a day. The switches may be set according to the following charts if it is known that your equipment will operate normally under such line voltage conditions. Normally, the switches should be left in the down position (this is the factory setting).

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Contents APC Back-UPS ImportantSafetyInstructions PleasesavethismanualPleasesaveorrecyclethepackagingmaterials TableofContents 3Optionswitches 2Userreplaceablebattery0Introduction 1OverviewTest / Alarm Disable switch 5SurgesuppressionandEMI/RFIfiltering6Remoteinterface 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 5Inverter6Transformer Monitoring and control electronics8Operationduringautilityfailure Page Power I/0 switch ControlsandindicatorsTest/Alarm Disable switch on units so equipped 3Audiblealarm4OptionSwitches Option Switch #1Option Switch #2 and #3 Option Switch #4 Option Switch #2 Switch #3 Undervoltage Transfer0UPSmonitoring 2PowerChuteSoftware600VAonlyPage 0Difficulty Françias 0Difficulté0SchwierigkeitDeutsch ¡Cuidado 0Dificultad EspañolMo r 1TroubleshootingChart1TroubleshootingChart 2ReplacingtheBattery 3ObtainingService StoringtheUPS StorageConditions2ExtendedStorage 0RunTimeVersusLoad 10.2TransferCharacteristics Specifications10.3OutputCharacteristics 10.4BatteryandchargerSurge and noise suppression 10.6OperatingenvironmentandphysicaldimensionsDeclaration of Conformity LimitedWarranty Page Serial number