MAKELSAN Challenger Series - General Information; Static Transfer Switch

CHALLENGERSERIES10‐60KVA  PRODUCTDESCRIPTION
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AG–SD‐35Rev.No:1Rev.Date:25.09.2013PublicationNo:2 15
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2.1GeneralInformation
 GeneraloperationtopologyofChallenger
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SeriesUPScanberecognizedasfollows:
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TheUPSisconnectedtothemainsvoltagethroughtheCB1breaker.AsDCbusisrampedup,
the rectifier starts to operate and converts the AC mains to DCvoltage.Whenthemains
voltage is not available, the DC/DC booster pumps the battery voltage to the necessary
level.DCDCbusvoltageisthenconvertedtomainssynchronizedACvoltagebytheinverter..
Thisisahighqualityvoltage.GeneratedACpowerisappliedloadsafterstaticsemi‐conductor
switchesandoutput(load)breakers.
2.1.1StaticTransferSwitch
Someblocksarenamedas“staticswitches”ascanbeseenabove. These blocks consist of
inverse parallel connected thyristors . These switches, which areunderthecontrolofthe
mainboard control unit (DSP), provides controlling of supplyingtheloadsthrougheither
mains or inverters.. The loads are supplied through inverter during the normal operating
mode.Therefore,Inverterstaticswitchesareactiveifthereisnoproblemwiththesystem.
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Systemprovidestheloadstobefedsmoothandseamlessbymainsorinverter.Inorderto
managehisprocessatminimumrisk,UPSsychronizestheinverteroutputandstatic(mains)
bypassasphaseandfrequency.Therefore,Inverterfrequencycanbeconsideredasmains.It
isthesameasmainsfrequencyaslongasitiswithinfrequencylimit.
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UsercanswitchtheUPSbetweenmainsandinverterbyusingfrontpanel.Whiletheloadsare
feddirectlybymainswiththeorderofuser,incaseofeitherpowerofformainsvaluesoutof
tolerances,theUPSwillstarttosupplytheloadsthroughbatterymode.
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Iftheuserwants,canprovidemainstofeedloadcontinuouslyby switching on the
maintenance bypass without making adjustment on the front panel. Later on, the user can
maketheinputandoutputswitchfusesshortcircuit.