Spec Sheet
Power Supply Output Specifications:
Output VDC Switch Position
12VDC SW1, SW2 ON, SW3, SW4 OFF
24VDC SW1, SW2 OFF, SW3, SW4 ON
Stand-by Specifications:
Output
4 hr. of Stand-by and
5 Minutes of Alarm
24 hr. of Stand-by and
5 Minutes of Alarm
60 hr. of Stand-by and
5 Minutes of Alarm
12VDC / 40 AH Battery
Stand-by = 2.5A
Alarm = 2.5A
Stand-by = 1.0A
Alarm = 2.5A
Stand-by = 300mA
Alarm = 2.5A
24VDC / 12 AH Battery ------------------------
Stand-by = 200mA
Alarm = 2.5A
------------------------
24VDC / 40 AH Battery
Stand-by = 2.5A
Alarm = 2.5A
Stand-by = 1.0A
Alarm = 2.5A
Stand-by = 300mA
Alarm = 2.5A
Installation Instructions:
The AL300ULB should be installed in accordance with article 760 of The National Electrical Code or NFPA 72 as well
as all applicable Local Codes.
1. Mount the AL300ULB in the desired location/enclosure.
2. Connect 28VAC / 100VA transformer to the terminals marked [AC, AC].
Use 18 AWG or larger for all power connections (Battery, DC output).
Use 22 AWG to 18 AWG for power-limited circuits (AC Fail/Low Battery reporting).
Keep power-limited wiring separate from non power-limited wiring (115VAC / 60Hz Input, Battery Wires).
Minimum 0.25” spacing must be provided.
CAUTION: Do not touch exposed metal parts. Shut branch circuit power before installing or servicing equipment.
There are no user serviceable parts on board. Refer installation and servicing to qualified service personnel.
3. Set the AL300ULB to the desired DC output voltage by setting switches to the appropriate positions
(refer to Power Supply Output Specifications Table).
4. Measure output voltage before connecting devices. This helps avoiding potential damage.
5. Connect devices to be powered to the terminals marked [+ DC -- ] (Fig. 1).
6. For Access Control applications batteries are optional. When batteries are not used, a loss of AC will result in the
loss of output voltage. When the use of stand-by batteries is desired, they must be lead acid or gel type.
Connect battery to the terminals marked [- BAT +] (Fig. 1) (battery leads included).
Use two (2) 12VDC batteries connected in series for 24VDC operation.
7. Connect supervisory trouble reporting devices to the outputs marked [LOW BAT, AC FAIL] (Fig. 1) supervisory
relays marked [NC, NO, C, ]. Use 22 AWG to 18 AWG for AC Fail and Low Battery reporting.
Input:
• Input 28VAC / 100VA.
Output:
• 12VDC or 24VDC selectable output.
• 2.5A continuous supply current.
• Filtered and electronically regulated output.
Battery Backup:
• Built-in charger for sealed lead acid or gel type batteries.
• Maximum charge current 600mA.
• Automatic switch over to stand-by battery
when AC fails.
Visual Indicators:
• AC input and DC output LED indicators.
Supervision:
• AC fail supervision (form “C” contacts).
• Low battery supervision (form “C” contacts).
Additional Features:
• Short circuit and thermal overload protection.
Board Dimensions (W x L x H approximate):
4.0” x 7.0” x 1.75” (101.6mm x 177.8mm x 51.05mm)
AL300ULB
Power Supply/Charger
AL300ULB Board
Output Dip Switches
Overview:
The AL300ULB is a power supply/charger that converts a 28VAC / 100VA input into a 12VDC or 24VDC output
(see specifications).
Specifications: