Altronix LPS3AC Installation Instructions Manual

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 Switch Transformer Requirements
Voltage Position (Recommended Altronix Part #'s)
12VDC Closed 16VAC / 56 VA (T1656).
24VAC or 28VAC / 100VA
24VDC Open
(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).
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
AC
DC
Fig. 1
Switch Detail
OPEN SWITCH
CLOSED SWITCH
AC FAIL
CONTACTS
NC C NO
SW2
12V-CLOSED
24V-OPEN