Samlexpower SeC-1215UL Owner's Manual - Section 4 |
8 | SAMLEX AMERICA INC.
seCtIOn 4 |
Charging states & Protections
Thesechargerscanbemanuallyselected
to operate in 3 stage or 2 stage modes
(Pleasesee"Selecting the type of Battery
and charging Stages"atpage11).The
chargingstagesaredescribedbelow:
Stage 1 - constant current or
Bulk charge Stage
Whenthebatteryislow,itwilltryto
drawlargerchargingcurrent.Thecharger
sensesthecurrentdrawandlimitsthis
tothemaximumpermissiblevalue(15A
forSEC-1215UL/SEC-2415ULand30Afor
SEC-1230UL).Bulkchargingtakesplaceat
thisconstantcurrent.in this condition of
constant current, the voltage measured
at the charger or battery terminals will be
the battery's own voltage.
Theconstantcurrentinjectedintothe
battery starts restoring the battery capac-
ityandit'svoltagestartsrising.When
thisvoltageapproachesthethreshold
ofbattery"gassing",termed"Boostor
AbsorptionVoltage",thechargerauto-
maticallyswitchesovertoStage2-"Boost
orAbsorptionStage".Thevalueofthis
voltagedependsuponthetypeofbattery
beingcharged(SeeDIPSwitchSettings).
Bythistime,approximately80%ofthe
batterycapacitywillnormallyhavebeen
restored (note:Thepercentagecapac-
ity restored till the point the battery
reachestheBoostorAbsorptionVoltageis
inverselyproportionaltothevalueofthe
bulkchargecurrent.)
Stage 2 - constant Voltage Boost
or Absorption Stage
Asexplainedabove,whenthebattery
voltageapproachesthepointwhere
battery"gassing"canbegin,thecharger
automaticallyswitchesovertothe"Boost
orAbsorptionStage".Thechargerapplies
aconstantvoltagewhosevaluedepends
uponthetypeofbatteryselected(SeeDIP
SwitchSettings).Thiscontrolledover-
chargerestoresthebalance20%ofthe
capacityinaminimumamountoftime.As
thecapacityisfullyrestored,thecharging
currentstartsreducing.Whenthecurrent
reducesbelowthepresetthreshold,the
chargerautomaticallyswitchestothe
"FloatorMaintenanceStage".
Stage 3 - constant Voltage , Float
or Maintenance charging Stage
Asexplainedabove,asthechargingcur-
rentdropsbelowthepresetthreshold
(1.5to2ampsforSEC-1215UL/SEC-2415UL
and2.5Ato3AforSEC-1230UL),itsignals
thatthebatteryis100%charged.
nOtes:
1.VOLTAGEREADINGSONNOLOAD
TheoutputhasonecommonNegativeterminalandthreePositiveterminalsforcharg-
ing3banksofbatteries.EachPositiveterminalhasaninternalisolatingdiodeinseries
whichhasaforwardvoltagedropof0.8to1.1V.Onnoload(thatiswhennobattery
orotherDCloadisconnectedtoanyofthe3terminals),thevoltagereadingwill
read0.8to1.1Vhigherthanthespecifiedfloatvoltage.Notethatthespecifiedfloat
voltageisataloadof1A.Also,thevoltageontheterminalsnotconnectedtothe
load(forexample,whenonebankofbatteryisconnectedtoonePositiveterminal,
theother2Positiveterminalswillremaindisconnected)willread0.8to1.1Volthigher
thanthevoltageoftheloadedterminal.
2.VOLTAGESPECIFICATIONS
Allratedvoltagesarespecifiedatbatterytemperatureof80°F.