LP-2

2A Linear Power Supply Charger Module

12/24 VDC Selectable

The LP-2/LPS-2 becomes an uninterruptible 2A 12 or 24 volt DC power supply when used with a transformer and lead acid battery. The output is clean, continuous, linear DC that can be used to power the most sensitive electronic devices. These units can be paralleled to double or triple output current.
Selecting 12v or 24v with the 12/24 programming jumper sets the DC output, battery charge voltage, trip points for the supervisory relays and foldback current limiting. The battery charger will charge a Sealed, Gel, or wet lead acid Battery.
The current the battery draws from the LP-2/LPS-2 is determined by the battery's condition, capacity, temperature and state of charge. The LP-2/LPS-2 is protected against shorts and overloading with its electronic circuitry and battery fuse or PTC. This same circuitry also protects the minimum 50VA transformer. When the DC load requires more than maximum output provided by the LP-2/LPS-2, the battery can add up to 4 moreAs. This may be necessary to sound a siren for the duration of an alarm. The LP-2/LPS-2 has a replaceable 4A battery fuse while the LP-2C/LPS-2C has an auto resetting 4A PTC circuit breaker.
To test the LP-2, battery and fuse: It is recommended that on a regular basis, the output should be checked for proper voltage and current while the AC power is disconnected.

CAUTION: USE APPROPRIATE MOUNTING HARDWARE. THE HEAT SINK IS HOT WITH VOLTAGE

  • LP-212/24 VDC @ 2A Linear Power Supply Charger module
  • LP(S)-212/24 VDC @ 2A Supervised Power Supply Charger module (S) may be added to any configuration
  • LP-412/24 VDC @ 4A Two LP-2’s connected together
  • LP-2EST12mounted in a 8”x 9” Enclosure with UL 16 VAC 50va Class II plug in Transformer
  • LP-2EST24mounted itn a 8”x 9” Enclosure with UL 24 VAC 50va Class II plug in Transformer
  • LP-2T12Module with UL 16 VAC 50va plug in Class II plug in Transformer
  • LP-2T24Module with UL 24 VAC 50va plug in Class II plug in Transformer
  • LP-2EX12D4mounted in a 14”x8” Enclosure with UL 16 VAC 56va open frame transformer and 4 fused outputs

Features

  • Selectable Output & Battery Charging 6/12/24 VDC
  • 1A Continuous Supply Current
  • Battery Charge Rate is Electronically Temperature Compensated
  • Clean Linear Output Electronically Protected against Over Current and Temperature
  • Fused Battery Protection with optional Auto Re-setting Circuit Breaker
  • Precise Output Regulation for Battery Charging
  • 12" Battery Leads with Protected Plug and Jack
  • Surge Protected
  • Self-Clamping Terminal Screws

Specifications

  • Input AC Transformer
  • Terminals 1 & 2 identified by .............. AC
  • 12 VDC at 2A DC Output ....... 16 – 18 VAC at 50VA
  • 24 VDC at 1.5A DC Output .......... 24 VAC at 50VA
  • 24 VDC at 2A DC Output........ 25 – 28 VAC at 70VA
  • 12 VDC at 1A DC Output....... 24 – 28 VAC at 50VA

  • Note: To Avoid damage to the transformer, do not use less than a 50VA (VoltA) rating. When selected for 12 VDC output and using a 24 VAC transformer, limit the output current to less than 1A.
  • AC LED Indicator (Next to AC Input Terminal Strip)
  • Indicates Input Power................... Red LED
  • DC Output Voltage Selector
  • 12/24 Jumper on top right of board. Place toward desired voltage setting.
  • CAUTION: Select voltage with load and battery(s) disconnected.
  • DC OUTPUT
    • Terminal 3 & 4 identified by................... DC
    • DC Output voltage............. Nominal 12 VDC/24 VDC
    • Output voltage.. Typical “AC ON” 13.75 VDC/27.50 VDC
    • DC Current maximum continuous rating......... 1.8A
    • Intermittent Current with Battery............. 6A
    • Note: Reserve at least 200ma for battery charging.
    • Load regulation, no load to 1.8A.......... .25%Typ
    • Ripple & noise @ 80% load............. 40mv pp Typ
    • Short circuit with foldback current limiting.. Yes
    • Maximum Current Output (No Battery)....... 2.6Amps
    • Short Circuit Current (No Battery).......... 700ma
    • Voltage Change after 1 year of Continuous Operation
    • (Long Term Stability)..................... .03 VDC
    • Ambient operating temperature range.. -30oF to +130oF
    • Storage Temperature............... -60oF to 190oF
    • Paralleling Units for more power
    • Daisy chain each pin together. Pin 1 to 1, 2 to 2, 3 to 3 and pin 4 to 4. It is very important to keep the polarity of the pins the same. When using one battery, use just one battery port connection and trouble relay if applicable. Transformer specifications listed above must be at least double.
  • Battery Charging: (Header plug marked [–Bat+])
    • The battery charger is precision set to float charge 12V or 24V Sealed, Gel or wet lead acid batteries. Two 12V batteries are connected in series for 24V. A 12” battery cable assembly is provided to connect the module to a battery. Red (+) 12 VDC, Black (–) Neg.
    • Optional 12” cable assembly for connecting two
    • 12v batteries in series for 24volts...... 24SW
    • Optional 36” battery cable (1) P/N:... WA-36IBAT
    • Battery(s), any type of lead acid.. 12v 4AH-100AH
    • Battery Fuse............................. 4A 3AGC
    • Battery PTC Auto Resetting.................... 4A
    • Reverse battery hookup protection........... Yes
    • To estimate the recharge time in hours for depleted battery(s), multiply the AH rating times 2.2 (AH x 2.2). As an example, a 24v system with two depleted 12v 7AH batteries would take about 15.4 hours to re-charge to 90% capacity. To select battery(s), see standy selection tablehere.
    • LPS-2 Supervised added features:
    • Trouble Output: 3P Terminal block - annunciates low battery & AC Fail “C” contacts rating................................ 2A/120 VAC
    • Three position trouble terminal block is marked “NO, C, NC” are shown in the Normal, energized, no trouble condition.
    • Trouble Low battery/AC Fail voltage..... 12.1 VDC/24.2 VDC
    • Battery Cutoff
    • Battery Cutoff Voltage............ 9.9 VDC/19.8 VDC
    • Battery Cutoff internal relay contacts....... 15A
    • Battery Cutoff Relay is normally energized for Fail Safe operation.
  • Physical
    • Center-to-Center Terminal Block Spacing with Self Clamping Screws .375”
    • Module Size................ 3 ¾”H x 3 11/16”W x 1 5/8”D
    • Mounting Holes Center-to-Center..... 3 5/16” W 3 7/16”H
    • Components Weight
    • LPS-2 module..................................... 3.2oz
    • 9x9 Enclosure................................... 3.8lbs
    • 100va Transformer............................... 2.8lbs
    • 50va Plug in Transformer....................... 1.7lbs
  • Safety
    • LP-2/LPS-2 meets safety UL1950 & EN60950