Altronix LPS3AC Quick Start Manual

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.
Input:
• 16VAC or 28VAC (refer to Voltage Output/
Transformer Selection Table).
Output:
• 12VDC/24VDC selectable output.
• 2.5A continuous supply current.*
• Filtered and electronically regulated output.
• Thermal overload and short circuit protection.
Supervision:
• AC Fail supervision (Form "C" contacts.)
*Specified at 25˚ C ambient.
Output
Voltage Position
12VDC
24VDC
LPS3AC should be installed in accordance with The National Electrical Code and all applicable Local
Regulations.
1. Mount LPS3AC in the desired location/enclosure (mounting hardware included).
2. Set DC output voltage using switch SW2 (Fig. 1) (refer to Voltage Output/Transformer Selection Table).
3. Connect proper transformer to the terminals marked AC (refer to Voltage Output/Transformer Selection Table).
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].
Red (DC) Green (AC)
ON ON
ON OFF
OFF ON
OFF OFF
LPS3AC
Linear Power Supply/Charger

Voltage Output/Transformer Selection Table:

Switch
ON
OFF

Installation Instructions:

Power Supply Status
Normal operating condition.
Loss of AC. Stand-by battery supplying power.
No DC output. Short circuit or thermal overload condition or defective unit.
No DC output. Loss of AC. Discharged or no battery present.

Overview:

Specifications:

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.
Visual Indicators:
• AC input and DC output LED indicators.
Board Dimensions (L x W x H):
7" x 4" x 2" (177.8mm x 101.6mm x 50.8mm)
Transformer Requirements
(Recommended Altronix Part #'s)
16VAC / 56 VA (T1656).
24VAC or 28VAC / 100VA (Altronix model T2428100)

LED Diagnostics: