Calira EVS 34/12-DS/IU - Page 28

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Operatinginstructions
Electric-SystemEVS34/12-DS/IU
CALIRA ElectronicGmbH&Co.KG
Lerchenfeldstr.987600KaufbeurenTel.+49(0)8341/9764-0Fax+49(0)8341/67806
Internet:http://www.calira.deEmail:info@calira.de
isgeneratedviaanisolationtransformerandatwo-waythyristorrectifier
circuit.
Inthemainchargingmode,theelectricalpowersupplydeliversacurrent
limitedto12 A untilthebatteryachievesalevelof14 V.From14 V onward,the
chargingcurrentdropsuntilbatteryvoltagereaches14.4 V. A timerisnow
activatedautomatically,andthepowersupplyholdsthebatteryvoltagecon-
stantat14.4 V for6hours.Onexpiryofthese6hours,thepowersupply
switchesovertoholdingchargewithaconstantvoltageof13.8 V. Thecharging
processfollowsthechargingcharacteristiccurveIUoU(Figure13),withmini-
malenergyloss.
Iftheconsumerdrawsfromthebatterycurrentthatexceedstheratedvalue,and
batteryvoltagedropsasaresultbelowapredeterminedvalue,themain
chargingprocessautomaticallystarts. Thisalsohappensduringthesix-hour
durationofthetimer. Thetimerisreactivatedoncompletionofthemainchar-
gingprocess.
Duringtravel,theEVSdetects(viathecablefromtheswitchedcontactno.10
atthecouplingplug)whethervoltageisapplied,andthereforewhetherthe
generatorisrunning.Ifvoltageisavailable,thevoltageboosterwillprovidean
outputof14.2 V tothesupplybattery,andtherefrigeratoroutputisenabled.
If,afterswitchingofftheengineofthetowingvehicle,nomorevoltageisbeing
appliedtocontact10,thevoltageboostershutsdownandtherefrigeratoris
turnedoff. Thispreventsthestarterbatterydischargingthroughthesupply
batteryandtherefrigerator. Thestartingcapabilityofthestarterbatteryisthus
conserved.Ifthecouplingplugisdisconnectedfromthetowingvehicle,the
EVSdesignensuresthattheplugcontactscannotconductvoltagefrom
thecaravanbattery.
Drivingoperation