Samlexpower SEC-1250UL Owner's Manual - Section 7 |
22 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 23
seCtIOn 7 |
Preparing the Charger for Operation
teMPeRAtURe coMPenSAtion
Thecellvoltagesofabatterydependuponthetemperatureofthecellsinsidethebat-
tery.ThecellshaveaNegativeTemperatureCoefficient-theirvoltagelevelsincrease
atlowertemperatureanddecreaseathighertemperature.TheNegativeTemperature
Coefficientis-2.5mV/ºF/cellor-15.0mV/ºF/6cellsfora12Vbatteryor-
30.0mV/ºF/12cellsfora24Vbattery.
Thebatteryandbatterychargervoltagesarenormallyspecifiedatatemperatureof
77ºF(25ºC).Thus,ifthebatterytemperatureisconsiderablylowerthanorhigherthan
77ºF,itwillbeunder-chargedorover-chargedunlessthebatterychargerhastempera-
ture compensation.
teMPeRAtURe SenSoR PRoBe tF-500
Thischargerhasaprovisionfortemperaturecompensation.Atemperaturesensorunit-
ModelNo.TF-500(Fig.7.3)isprovidedforthispurpose.
Fig. 7.3. Temperature Sensor Model No. TF-500
!
cAUtion!
This temperature sensor is matched and calibrated for each battery charger and
should not be interchanged with the sensor from another battery charger.
The temperature sensor comes with 5 Meter cable. It has a plug on one end. Connect this
plugintothejackmarkedTS(4)ontherearpanelofthecharger.Theotherendhasthe
temperaturesensorelement.Mountthistemperaturesensorelementflushwiththeside
surface of the battery for proper heat transfer.
Whenthetemperaturesensorisconnected,thevoltagesduringStages2and3are
automaticallyadjustedasperthetemperatureofthebatteryandtheabovetemperature
coefficient.
Plug
Temperature
Sensor Element