Installation Instructions

Overview:
LPS3/LPS3R linear power supply/chargers convert a low voltage AC input to a low voltage 12VDC/24VDC output.
These power supplies are specifically designed to provide the power needed by the most demanding security and access
control applications.
Specifications:
Input:
• 16VACor28VAC
(refer to Voltage Output/Transformer Selection Table).
Output:
• 12VDC/24VDCselectableoutput.
• 2.5ampcontinuoussupplycurrent.
• Filteredandelectronicallyregulatedoutput.
• Thermaloverloadandshortcircuitprotection.
Battery Backup:
• Built-inchargerforsealedleadacidorgeltypebatteries.
• Maximumchargecurrent500mA.
• Automaticswitchovertostand-bybattery.
• Fusedbatteryprotection(circuitbreakeravailable).
• Includesbatteryleads.
Supervision:
• LPS3RisthesameasLPS3withACFailsupervision(Form“C”contacts.)
Visual Indicators:
• ACinputandDCoutputLEDindicators.
Board Dimensions (approximate):
7”x4”x2”(177.8mmx101.6mmx50.8mm)
Specifiedat25˚Cambient.
Voltage Output/Transformer Selection Table:
Output Voltage
Switch
Position
Transformer Requirements
(Recommended Altronix Part #’s)
12VDC Closed 16VAC/56VA(T1656).
24VDC Open
24VACor28VAC/100VA
(AltronixmodelT2428100)
Note: Transformers with higher VA ratings may be used.
Installation Instructions:
TheLPS3/LPS3RshouldbeinstalledinaccordancewithTheNationalElectricalCodeandallapplicableLocal
Regulations.
1. MounttheLPS3/LPS3Rinthedesiredlocation/enclosure.
2. Set DC output voltage using switch SW2 (refer to Voltage Output/Transformer Selection Table).
3. ConnectpropertransformertotheterminalsmarkedAC(refer to Voltage Output/Transformer Selection Table).
4. Measureoutputvoltagebeforeconnectingdevices.Thishelpsavoidingpotentialdamage.
5. Connectdevicestobepoweredtotheterminalsmarked[----DC+].
6. Whentheuseofstand-bybatteriesisdesired,theymustbeleadacidorgeltype.
 Connectbatterytotheterminalsmarked[+BAT---]ontheunit(batteryleadsincluded).
Use two (2) 12VDC batteries connected in series for 24VDC operation.
7. Whenbatteriesarenotused,alossofACwillresultinthelossofoutputvoltage.
8. Connectsupervisorytroublereportingdevicestooutputsmarked[ACFail](LPS3Ronly).
CAUTION: Do not touch exposed metal parts. Shut branch circuit power before installing or servicing equipment.
There are no user serviceable parts inside. Refer installation and servicing to qualified service personnel.
LPS3/LPS3R - Linear Power Supply/Charger
AC
DC
AC
AC FAIL
CONTACTS
AC
-- DC +
-- BAT +
NC C NO
SW1
12V-CLOSED
24V-OPEN
OPEN SWITCH
CLOSED SWITCH
Switch Detail
AC
DC
AC
AC FAIL
CONTACTS
AC
-- DC +
-- BAT +
NC C NO
SW1
12V-CLOSED
24V-OPEN
Fig. 1