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Mean Well LAD-120B Security/Fire Alarm PSU with Battery Charger/UPS, 120W, 27.6V 3.4A
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Mean Well LAD-120B Security/Fire Alarm PSU with Battery Charger/UPS...
Overview
LAD-120B is the CH1: 27.6V / CH2: 27.6V output model of this series: rated current CH1: 3.4A / CH2: 1A(Battery Charger), rated power 121.4W, typical efficiency 88%.
LAD-120 series is a 120W economical AC/DC low profile security power supply with UPS function. Adopting the input range from 90Vac to 264Vac and supports output 13.8V, 27.6V, 41.5V and 55.2Vdc. With high efficiency up to 88% and built-in AC, battery switch for easy maintenance. In addition, LAD-120 series also provide TTL signals for AC OK, battery disconnect, battery reverse polarity (No damage), battery low detection, battery full and discharge, to allow easy integration into security and fire systems directly.
Features
- Built-in battery charger and UPS function
- TTL signals for status detection: AC OK, Battery disconnect, Battery reverse polarity, Battery low, Battery full and Discharge
- Built-in AC and battery circuit ON/OFF switches enhance safetyness during maintenance
- Forced UPS mode for battery maintenance
- Protections: Short circuit / Overload / Over voltage / Over temperature / Battery low voltage / Battery reverse polarity (No damage)
- -20 ~ +60℃ wide operating temperature
- Output voltage adjustable (-20%~+5%) for CH1 by VR
- Suitable for lead acid and lithium-ion batteries
- Design refer to GB17945 system requirement
- 1U low profile (30 mm)
- 3 years warranty
Specifications
OUTPUT
- OUTPUT NUMBER
- CH1 / CH2
- DC VOLTAGE
- CH1: 27.6V / CH2: 27.6V
- RATED CURRENT
- CH1: 3.4A / CH2: 1A(Battery Charger)
- CURRENT RANGE
- CH1: 0 ~ 4.4A / CH2: --------
- RATED POWER
- 121.4W
- RIPPLE & NOISE (max.)Note.2
- CH1: 150mVp-p / CH2: --------
- VOLTAGE ADJ. RANGE
- CH1: 21.6 ~ 29V
- VOLTAGE TOLERANCENote.3
- CH1: ±1.0% / CH2: --------
- LINE REGULATION
- CH1: ±0.5% / CH2: --------
- LOAD REGULATION
- CH1: ±0.5% / CH2: --------
- SETUP, RISE TIME
- 500ms, 40ms/230VAC 500ms, 40ms/115VAC at full load
- HOLD UP TIME (Typ.)
- 40ms/230VAC 9ms/115VAC at full load
- BATTERY STATIC DISCHARGE CURRENT
- <100μA
INPUT
- VOLTAGE RANGE
- 90 ~ 264VAC 127 ~ 370VDC
- FREQUENCY RANGE
- 47 ~ 63Hz
- EFFICIENCY (Typ.)
- 88%
- AC CURRENT (Typ.)
- 2.5A/115VAC 1.5A/230VAC
- INRUSH CURRENT (Typ.)
- COLD START 30A/115VAC 55A/230VAC
- LEAKAGE CURRENT
- 0.5mA / 240VAC
PROTECTION
- OVERLOAD
- CH1:105 ~ 135% CH2:90 ~ 110% Protection type : CH1 OLP, CH2 with battery: The unit will enter to UPS mode when CH1 is around 105%~160%, when total output of CH1 + CH2 reach around 125%~135% output hiccup(120D shuts down) CH1 OLP, CH2 without battery:Hiccup mode o/p voltage, recovers automatically after fault condition is removed (120D shuts down,re-power on to removed) CH2 : Constant current limiting; fault condition does not affect CH1 working,recovers automatically after fault condition is removed (External fuse is mandatory in series connection with battery for protection)
- OVER VOLTAGE
- CH1:31 ~ 36V Protection type : Shut down o/p voltage, re-power on to removed
- OVER TEMPERATURE
- Protection type : Shut down o/p voltage, re-power on to removed
- BATTERY REVERSE POLARITY
- Protected when reverse polarity , no damage, recovers automatically after fault condition is removed
- BATTERY CUTOFF
- 21.5V±0.5V
FUNCTION
- AC OK
- TTL signal, High / Open : AC Fail ; Low : AC OK ; Ice : max. 30mA@ 50VDC
- BATTERY DISCONNECT/ REVERSE POLARITY
- TTL signal, High / Open : Battery connect/normal ; Low : Battery disconnect/reverse polarity; Ice : max. 30mA@ 50VDC
- BATTERY LOW
- TTL signal, High / Open : Battery normal ; Low : Battery low; Ice : max. 30mA@ 50VDC
- BATTERY FULL
- TTL signal, High / Open : Battery charging ; Low : Battery full ; Ice : max. 30mA@ 50VDC
- DISCHARGE
- TTL signal, High / Open : Charge ; Low : Discharge ; Ice : max. 30mA@ 50VDC
ENVIRONMENT
- WORKING TEMP.
- -20 ~ +60℃ (Refer to "Derating Curve")
- WORKING HUMIDITY
- 20 ~ 95% RH non-condensing
- STORAGE TEMP., HUMIDITY
- -30 ~ +85℃, 10 ~ 95% RH non-condensing
- TEMP. COEFFICIENT
- ±0.03%/℃ (0 ~ 50℃)
- VIBRATION
- 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes
SAFETY & EMC
- SAFETY STANDARDS
- UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, EAC TP TC 004 approved; Design refer to GB 17945-2010
- WITHSTAND VOLTAGE
- I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
- ISOLATION RESISTANCE
- I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
- EMC EMISSIONNote 4
-
Parameter Standard Test Level Conducted BS EN/EN55032 (CISPR32), EAC TP TC 020 Class A Radiated BS EN/EN55032 (CISPR32), EAC TP TC 020 Class A Harmonic Current (Note 5) BS EN/EN61000-3-2 Class A - EMC IMMUNITY
-
Parameter Standard Test Level ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 6KV contact; criteria A Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;2KV/Line-FG ;criteria A Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A
OTHERS
- MTBF
- 1509.9K hrs min. Telcordia SR-332 (Bellcore); 209.4K hrs min. MIL-HDBK-217F (25℃)
- DIMENSION
- 159*97*30mm (L*W*H)
- PACKING
- 0.42Kg; 30pcs/13.6Kg/0.77CUFT
Test conditions and notes6
- 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
- 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
- 3. Tolerance : includes set up tolerance, line regulation and load regulation.
- 4. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
- 5. Test harmonic current at 85% load.
- 6. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
Technical drawings
Typical applications
- Fire emergency and evacuation system
- Public safety battery back-up
- Security system
- Uninterruptible DC-UPS system
- Central monitoring system
- Industrial automation
Downloads
Datasheet1
FAQ
What is the Mean Well LAD-120B designed for?
The LAD-120B is a 120W security and fire alarm power supply with a built-in battery charger and UPS function. It is intended for systems that need a regulated 27.6VDC output with battery backup support and status monitoring signals.
What are the main electrical ratings of the LAD-120B?
This model is rated for 121.4W output at 27.6VDC with a rated current of 3.4A. Its input range is 90 to 264VAC or 127 to 370VDC, which supports use across a wide range of standard mains conditions.
Does the LAD-120B support battery-backed operation?
Yes. The LAD-120B includes a built-in 1A battery charger, UPS function, and a forced start UPS mode via CN2 pins 7 and 8. This makes it useful where backup power continuity is required.
What status and fault monitoring signals are available on this power supply?
The LAD-120B provides TTL status signals for AC OK, battery disconnect, battery reverse polarity, battery low, battery full, and discharge. These signals can help with system-level status detection in security or fire alarm applications.
How does the LAD-120B differ from a standard enclosed AC-DC power supply?
Unlike a standard AC-DC power supply that only provides DC output, the LAD-120B combines the power supply, battery charger, and UPS functions in one unit. It is also tailored for security and fire alarm use with battery-related protections and status reporting.
Is the LAD-120B suitable for demanding operating environments?
The unit is rated for operation from -20°C to +60°C with load derating per the derating curve, which supports use in a wide range of indoor equipment environments. It also includes protections for overload, over voltage, over temperature, battery low voltage, and battery reverse polarity.
What certifications and physical characteristics does the LAD-120B offer?
The LAD-120B is approved to UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, and EAC TP TC 004, with design reference to GB 17945-2010. It has a low-profile form factor at 159 x 97 x 30 mm and weighs 0.42 kg.
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