EnerSys Alpha Cordex CXC HP - Page 76

Cordex®CXCHPControllerSoftwareManual|5-DCpowersystems
Test discharge initiation
Whenthetestbegins,anentryismadeintheeventlog.IftheBattery Test Alarm hasbeenenabled,it
providesawarningtoindicatethatabatterytestisinprogress.Theoutputvoltageoftherectifiersisset
totheBatteryTestTerminationVoltagetoallowthebatterytodischarge.BatteryModechangestoTest
Dischargewhenabatterytestisstarted.
Testdischargemoderunsfortheperiodsetastimeoutoruntilthebatterytestterminationvoltageis
reachedorthebatterytestterminationSOCisreached(ifenabled).
Therectifiersareperiodicallyscannedtoensurethattheydonotbeginsourcingcurrent.Ifsothenthe
testisstoppedandthebatteryisrecharged.
Therectifierfloatvoltageisresettothesettingthatisstoredinthesystemcontroller.Whenthesystem
voltagereachestheend(termination)voltageoratimeoutoccurs,thesystemcontrollerwillcommandthe
rectifierstoturnonandenterFLmode.
Activity during test discharge mode
Temperaturecompensationfeaturesaresuspendedduringabatterytest.Whenthebatteryis
discharging,thebatterytestalarmisactive.Batterystateofhealthestimationbeginsatthreepercent
ofDOD,butisnotdisplayedunlessDOD>20percent;thepointatwhichreasonableaccuracycanbe
assured.
AC failure during test discharge mode
IftheACfailsduringabatterytest,thetestisaborted.Thisplacestherectifiersintoastatethatenables
themtoresumeprovidingpowertotheloadwhenACreturns.Iftheruntimeisbeingdisplayed,it
continuestoupdate.
Addition of rectifiers during test discharge mode
Ifrectifiersareaddedtothesystemwhenabatterytestisactive,theyareplacedintothesamestateas
thecurrentsystemrectifiers.Theyareeither:placedintobatteryteststateorsettothesamevoltageas
rectifiersalreadyinthesystem.
Conditions to watch for during test discharge mode
Ifthevoltagedropsbelow46voltsbeforeorwhenthreepercentdepthofdischargeisreached,thetest
isabortedandthebatteryhealthissettozeropercent(resultinginaBattery Health Low alarm).This
providesanindicationthatthebatteryisveryweak.Batterystateofhealthmustbemanuallyresetto
100percentbeforethenextbatterytestisstarted,sothatthebatterymonitorcanproperlyestimatethe
batteryhealth.Ifrectifiersaresourcingcurrentduringthetest,andthebatteryceasesdischarging,the
testisaborted.
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