Altronix AL400ULB UL Recognized Power Supply/Charger
Overview
The Altronix AL400ULB is a power-limited supply/charger that converts a 28VAC / 100VA input into a Class 2 Rated power-limited 12VDC or 24VDC output.
Specifications
Agency Listings
- UL Recognized component for:
- UL 294* Access Control System Units.
- UL 603 Power Supplies for Use with Burglar-Alarm Systems.
- UL 1481 Fire Protective Signaling Systems.
Input
Input: 28VAC / 175VA.
Output
- Class 2 Rated power-limited output.
- 12VDC or 24VDC selectable output.
- 4A continuous supply current @ 12VDC.
- 3A continuous supply current @ 24VDC.
- 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
Approximate (L x W x H): 7.0" x 4.0" x 1.6” (177.8 mm x 101.6 mm x 40 mm).
Access Control Performance Levels
Destructive Attack - N/A; Endurance - IV; Line Security - I; Stand-by Power - IV.
Power Supply Output Specifications
| Output VDC | Switch Position | Max. Stand-by Load DC | Max. Alarm Load DC | Stand-by Battery |
|---|---|---|---|---|
| 12VDC | SW 1, 2 ON, SW 3, 4 OFF | 4.0A | 4.0A | 24V/40AH |
| SW 1, 2 OFF, SW 3, 4 ON | 200mA | 4.0A | 12V/12AH | |
| 24VDC | SW 1, 2 ON, SW 3, 4 OFF | 3.0A | 3.0A | 24V/12AH |
| SW 1, 2 OFF, SW 3, 4 ON | 200mA | 3.0A | 24V/12AH |
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 / 40AH Battery | Stand-by = 4.0A Alarm = 4.0A |
Stand-by = 1.0A Alarm = 4.0A |
Stand-by = 300mA Alarm = 4.0A |
| 24VDC / 12AH Battery | Stand-by = 200mA Alarm = 3.0A |
Stand-by = 1.0A Alarm = 3.0A |
Stand-by = 300mA Alarm = 3.0A |
| 24VDC / 40AH Battery | Stand-by = 3.0A Alarm = 3.0A |
Stand-by = 1.0A Alarm = 3.0A |
Stand-by = 300mA Alarm = 3.0A |
Installation Instructions
The AL400ULB should be installed in accordance with article 760 of The National Electrical Code or NFPA 72 as well as all applicable Local Codes.
- Mount AL400ULB in the desired location/enclosure (mounting hardware included).
- Connect 28VAC / 175VA transformer to the terminals marked [AC AC] (Fig. 1). Use 18 AWG or larger for all power connections (Battery, DC output). Use 22 AWG to 18 AWG for the 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 inside. Refer installation and servicing to qualified service personnel.
- Set the AL400ULB to the desired DC output voltage by setting the switches to the appropriate positions (Power Supply Output Specifications Table).
- Connect devices to be powered to the terminals marked [+ DC -] (Fig. 1).
- Measure output voltage before connecting devices. This helps avoiding potential damage.
- 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 [- BAT +] (Fig. 1) as marked on the unit (battery leads included). Use two (2) 12VDC batteries connected in series for 24VDC operation.
- Connect supervisory trouble reporting devices to the outputs marked [LOW BAT, AC FAIL] supervisory relays marked [NC, NO, C] (Fig. 1). Use 22 AWG to 18 AWG for AC Fail and Low Battery reporting.
Diagram: Figure 1 - Terminal Connections and DIP Switches
This diagram illustrates the AL400ULB board layout. Key elements include:
- DC Output Terminals: Marked [+ DC -].
- AC Input Terminals: Marked [AC AC].
- DIP Switches (SW1-SW4): Used for setting output voltage and configuration. The diagram shows settings for 24VDC (SW1, 2 OFF; SW3, 4 ON) and 12VDC (SW1, 2 ON; SW3, 4 OFF). A visual representation shows four DIP switches, typically used for configuration.
- Battery Terminals: Marked [- BAT +].
- Supervisory Relay Terminals: Labeled [AC FAIL NC, NO, C] and [BAT FAIL NC, C, NO].
- Other components: Various electronic components and connectors are depicted.
Maintenance
The unit should be tested at least once a year for proper operation.
Output Voltage Test
Under normal load conditions, check the DC output voltage for proper level (refer to Power Supply Output Specifications Table).
Battery Test
Under normal load conditions, check that the battery is fully charged. Verify the specified voltage at both the battery terminal and the board terminals marked [- BAT +] to ensure no break in battery connection wires.
Note: Maximum charging current during discharges is 1.25A.
Note: Expected battery life is 5 years; however, it is recommended to change batteries in 4 years or less if needed.
LED Diagnostics
| LED | ON | OFF |
|---|---|---|
| AC (Green) | Normal operation | No AC input |
| DC (Red) | Normal operation | No DC output |
Terminal Identification
| Terminal Legend | Function/Description |
|---|---|
| AC, AC | Low voltage (28VAC) transformer connections. |
| +DC - | 12VDC @ 4A or 24VDC @ 3A continuous power-limited output. |
| AC Fail NC, NO, C | Indicates loss of AC power, e.g., connect to audible device or alarm panel. Relay normally energized when AC power is present. Contact rating 1A @ 30VDC. |
| Bat Fail NC, C, NO | Indicates low battery condition, e.g., connect to alarm panel. Relay normally energized when DC power is present. Contact rating 1A @ 30VDC. |
| - BAT + | Stand-by battery connections. Maximum charge current 600mA. |
