ABB LWN2660-6
ABB LWN2660-6 - Image 2

ABB LWN2660-6

Product Overview:
The ABB LWN2660-6 is a high-performance, dual-output master AC-DC or DC-DC flyback converter designed for DIN rail mounting. Engineered for demanding industrial environments, it provides highly efficient power conversion with Power Factor Correction (PFC) in a single stage. It delivers a stable, isolated Safety Extra-Low Voltage (SELV) output with exceptionally low noise, making it a reliable power source for critical industrial control systems.

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Category: SKU: ABB LWN2660-6

Description

ABB LWN2660-6

Technical Specifications:

  • Model & Series: LWN2660-6, belonging to the LWN series.
  • Input Voltage Range: Universal AC input from 85 VAC to 264 VAC, and DC input from 90 VDC to 350 VDC.
  • Output Specifications: Dual independent outputs, rated at 24 VDC (adjustable up to 25.8 VDC) with a rated output current of 5A per channel.
  • Rated Power: Capable of delivering up to 250W of continuous power.
  • Switching Frequency: Constant switching frequency of 130 kHz.
  • Operating Temperature: Rated for extreme environments with an operating temperature range of -40°C to +60°C without power derating.
  • Reliability: Exceptional Mean Time Between Failures (MTBF) exceeding 600,000 hours.

Functional Features:

  • High Efficiency: Achieves power conversion efficiency of up to 87%, minimizing energy waste and heat generation.
  • Independent Output Regulation: Features dual outputs that can be independently adjusted and regulated.
  • Comprehensive Protection: Equipped with internal protection circuits against overloads, short circuits, and over-voltage.
  • Low Inrush Current: Features an almost non-existent startup inrush current, protecting upstream breakers and fuses.
  • Status Indication: Includes a green LED on the front panel for clear visual indication of operational status.

Application Scenarios:

  • Building automation and control systems.
  • Factory automation and industrial control panels.
  • Electromagnetic drivers and actuators.
  • Precision instrumentation and testing equipment.
  • Fan and general DC load power distribution.

Performance Parameters:

  • Power Factor: Integrated Power Factor Correction (PFC) ensures compliance with IEC/EN 61000-3-2 harmonic standards.
  • EMC Compliance: Meets strict electromagnetic compatibility standards, including EN IEC 61204-3, EN 50121-3-2, and EN 55011/55032.
  • Output Quality: Provides electrical isolation and extremely low output noise, ensuring clean power for sensitive electronics.
  • Peak Power Capability: Supports short-term output peak power with a rectangular current limiting characteristic.

Material Composition & Structural Characteristics:

  • PCB Protection: The printed circuit board is coated with a protective lacquer (conformal coating) to resist moisture, dust, and corrosive elements.
  • Enclosure: Features a robust, fire-retardant plastic housing designed for secure 35 mm DIN rail snap-in mounting.
  • Thermal Management: Designed for natural convection cooling, eliminating the need for internal fans and reducing mechanical failure points.
  • Dimensions: Compact form factor measuring approximately 106 mm (L) x 103 mm (W) x 138 mm (H).

Working Principle:
The LWN2660-6 operates as a switch-mode flyback converter. It rectifies the incoming AC or DC voltage and utilizes a single-stage conversion topology with Power Factor Correction. The internal switching transistor operates at a constant 130 kHz frequency to regulate the output voltage. A feedback loop continuously monitors the output, adjusting the duty cycle to maintain a precise 24 VDC output while providing galvanic isolation between the input and output circuits.

Installation Requirements:

  • Mounting: Securely snap the unit onto a standard 35 mm DIN rail, ensuring the locking mechanism is fully engaged.
  • Clearance: Maintain adequate spacing around the unit to allow for unrestricted natural convection airflow.
  • Wiring: Use appropriately sized copper conductors and ensure all terminal screws are tightened to the specified torque to prevent hot spots.
  • Parallel Operation: If paralleling multiple units for increased current, insert droop resistors in the Vo+ output lines to ensure proper current sharing.

Usage Precautions:

  • Thermal Limits: Avoid operating the unit simultaneously at minimum input voltage, maximum output power, and maximum ambient temperature.
  • Battery Charging Variant: If utilizing the battery charger variant (Option M1), connect the dedicated temperature sensor to optimize charging voltage and extend battery life. Note that this variant cannot be paralleled without disabling the sensor.
  • ESD Safety: Observe standard Electrostatic Discharge (ESD) precautions during installation and maintenance.
  • Maintenance: Do not attempt to open or repair the internal components. Replace the entire module if a fault is indicated by the status LED.

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