Samlexpower SEC-1250UL Owner's Manual - Section 4 |
12 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 13
seCtIOn 4 |
Principle of Operation
28V/28.8VatboththechargerandbatteryterminalsistheconstantAbsorptionVolt-
agebeingputoutbythecharger.Theintrinsicvoltageofthebatteryisstilllowerthan
thisvoltageasthebatteryisstillnotfullychargedatthistransition).Astheintrinsic
voltageofthebatteryrisesfurther,thechargingcurrentstartstaperingdown(section
D2toE2).Taperingchargeisprovidedatthistransitiontoreducesurfacechargeeffect
toensurethatthechargeslowlydiffusestotheinternalthicknessoftheplatesand
preventsovercharging.
Whenthe4Hr/8HrTimerrunsoutorwhenthechargingcurrenttapersdownto10%
oftheratedcapacityofthecharger(5A+/-0.5AforSEC-1250ULand3A+/-0.5AforSEC-
2425UL)atpoint“E2”(whicheverisearlier),thechargertransitionstothenextStage3
-ConstantVoltage,FloatorMaintenanceChargeStage(“U”Phase)
note: Thethresholdofcurrentforchange-overbetweentheConstantOverchargeVolt-
age,TimedVoltageAbsorption/BoostStage(“U0”Phase)&theFloat/Maintenance
ChargeMode(“U”Phase)aredifferentasfollows:
Sec-1250Ul
Sec-2425UL
From“Uo”Phaseto“U”Phase
5A+/-0.5A
3A+/-0.5A
From“U”Phaseto“Uo”Phase
10A+/-1A
6A+/-1A
charging characteristics during this Stage Are As Follows:
• TheAbsorptionStage(“U
o
”Phase)feedsadditional35%to55%ofthecapacitythat
addsuptoatotalchargedcapacityofaround115%totakecareofaround15%loss
of charging efficiency.
• OrangeLEDmarked“U
o
”PhaseontheoptionalRemoteControl900-RCwillbelit
StAGe 3 - conStAnt VoltAGe, FloAt oR MAintenAnce
cHARGe StAGe (U PHASe)
Duringthismode,thechargeroutputsaconstantvoltage"U"=13.5V(SEC-1250UL)or
27V(SEC-2425UL).Thishelpsinmaintainingfullcapacityofthebatteryandalsopro-
videsreplacementchargetoovercomeselfdischargeofthebattery.Thebattery
canremainconnectedinthisstageindefinitelywithouttheriskofdischarging.
charging characteristics during this stage are as follows:
GreenLEDmarkedFloatStage(“U”Phase)ontheoptionalRemoteControl
900-RCwillbelit.