Installation Instructions

Overview:
LPS3AC linear power supply/charger converts a low voltage AC input to a 12VDC/24VDC output. This power supply is
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 Chart).
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:
• ProvidesACFailsupervision(Form“C”contacts).
Visual Indicators:
• ACinputandDCoutputLEDindicators.
Board Dimensions (W x L x H approximate):
4”x7”x2”(101.6mmx177.8mm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
(AltronixmodelT1656).
24VDC Open
24VACor28VAC/100VA
(AltronixmodelT2428100)
Note: Transformers with higher VA ratings may be used.
Installation Instructions:
TheLPS3ACshouldbeinstalledinaccordancewithTheNationalElectricalCodeandallapplicableLocalRegulations.
1. MountLPS3ACinthedesiredlocation/enclosure.
2. Set DC output voltage using switch SW2 (Fig. 1) (refer to Voltage Output/Transformer Selection Chart).
3. ConnectpropertransformertotheterminalsmarkedAC(refer to Voltage Output/Transformer Selection Chart).
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.
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theoutputsmarked[ACFail].
LPS3AC - Linear Power Supply/Charger
OPEN SWITCH
CLOSED SWITCH
Switch Detail
AC
DC
AC
AC FAIL
CONTACTS
AC
-- DC +
-- BAT +
NC C NO
SW1
12V-CLOSED
24V-OPEN
SW2
12V-CLOSED
24V-OPEN
Fig. 1