EnerSys Alpha Cordex CXC HP - Battery Temperature Compensation

Cordex®CXCHPControllerSoftwareManual|5-DCpowersystems
Absorption charging
Aftertheabsorptionchargingstage,thebatteryshouldbeina95to98percentstateofcharge.Onthe
Systems > DC System > System Functions > Charging page,ontheElevated Absorption Charging
Status table,youhavetheoptiontochargethebatteryatavoltagehigherthanthefloatvoltage.The
highervoltageisusedtospeeduptheabsorptionchargingstageafteraprolongedACpowerfailure.
Conditioning - float
Theconditioningorfloatchargingstagebringsthebatteriesto100percentstateofchargeandmaintains
itthere.WhenthesystemisintheconditioningstageitisusuallyattheFloat Voltage.Whenthesystem
isinconditioning-float,ahigherEqualize Voltage orBoost Voltage canbeappliedfromtheSystems >
DC System > System Functions > Equalize & Boost menu.
Conditioning - equalization
Whenastringofbatterycellsorblocksarecharged,asinglechargecurrentisappliedonthegroup.
Ifthevoltagesofthecellsorblocksbegintodiffer,thechargeimbalancecanleadtobatteryfailure.
ApplyingahigherEqualize Voltage toafullychargedbatterystringsubjectsthestrongercellsorblocks
tooverchargebutthisalsoallowstheweakercellsorblockstoregaintheirfullcharge.Whenthevoltage
isreturnedtotheFloat Voltage,thestrongercellsshedtheiroverchargeandthebatterystringshouldbe
morebalancedorequalized.
ApplyinganEqualizeVoltage(anovercharge)toafullychargedbatterycanalsobeusedtoreverse
sulfation.
CAUTION: Applying an overcharge to a battery string also has negative effects on the batteries.
See the battery manufacturer’s guide to determine whether an equalization voltage should be
used at all. If so, what the voltage and the duration should be, and how frequently an equalization
charge should be applied.
Conditioning - boost
Thepurposeofboostissimilartoequalize-toequalizecellsorreversesulfation.Boostvoltageisusually
ahighervoltagethanequalize.Infactitcanbetoohighfortheloadandthereforerequirethepresenceof
droppingdiodestobeswitchedintothecircuitbetweentherectifiersandtheloadtopreventdamageto
theload.Beforeboostcanbeactivated,thedroppingdiodesmustbeswitchedintothecircuit.
5.2.4. Battery temperature compensation
Temperaturecompensation(TempComp)isusedtoprolongbatterylifeandhelppreventthermal
runaway.Whenbatterytemperaturecompensationisenabled,thecontrollerusesthebatterytemperature
tocalculateanoffsetwhichisappliedtothebatteryvoltage.
Atypicaltemperaturecompensationcurvefora48voltbatterysystemisshowninthefollowingfigure.
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