ABB LWN2660-6EG 3BHL000986P7002

Description

Product Description

The ABB LWN2660-6EG 3BHL000986P7002 is a high-performance, high-voltage liquid rheostat starter, specifically designed for the controlled starting of large slip-ring motors. As a robust and reliable component within ABB’s extensive motor control portfolio, the ABB LWN2660-6EG 3BHL000986P7002 provides a smooth, stepless acceleration by dynamically varying the resistance in the motor rotor circuit. This critical piece of equipment protects both the motor and the driven mechanical load from the damaging effects of high inrush current and torque during start-up. the ABB LWN2660-6EG 3BHL000986P7002 is a preferred solution for heavy-duty applications where reliable and controlled starting is paramount, seamlessly integrating into broader automation and protection schemes.

Product Parameters

• Product Type: Liquid Rheostat Starter for Slip-Ring Motors.
• Brand & Series: ABB, part of the LWN series of starters.
• Model: ABB LWN2660-6EG 3BHL000986P7002.
• Rated Motor Power: Designed for motors up to several megawatts (specific kW/HP rating is defined by the model suffix and must be confirmed from the datasheet).
• Rotor Current: Matched to the rated rotor current of the target slip-ring motor.
• Resistance Control: Utilizes an electrolyte solution (typically sodium carbonate) and movable electrodes to provide variable resistance.
• Cooling System: Often includes a built-in heat exchanger and pump for circulation and cooling of the electrolyte.
• Control System: Includes local controls, electrode drive motor, level and temperature sensors, and interfaces for remote control/automation (e.g., analog input for speed reference, digital I/O for status).
• Enclosure: Robust IP-rated enclosure suitable for industrial installation.
• Standards: Complies with relevant IEC and other international standards for electrical equipment.

Advantages and Features

The ABB LWN2660-6EG 3BHL000986P7002 offers significant advantages over fixed-step resistor starters or electromechanical starters. Its primary feature is a stepless, smooth acceleration curve, which minimizes mechanical stress on gears, couplings, and the driven load (e.g., a conveyor or mill). This results in extended equipment life and reduced maintenance. It provides a high starting torque with a low starting current from the supply network, improving power quality. The system is self-regulating and robust, with built-in diagnostics for electrolyte level, temperature, and electrode position. Its design allows for easy adjustment of start-up time and torque characteristics to match the specific load.

Application Cases in Application Fields

This starter is essential in heavy industries with large, high-inertia loads. In mining and mineral processing, the ABB LWN2660-6EG 3BHL000986P7002 is used to start ball mills, semi-autogenous grinding (SAG) mills, and large conveyor drives. In the cement industry, it controls the starting of crushers, kilns, and raw material mills. For water and wastewater management, it starts large high-voltage pumps and fan drives. In metals and mining, it is applied to drum hoists and winders. In each case, the ABB LWN2660-6EG 3BHL000986P7002 is often supervised and initiated by a central PLC or DCS system, which monitors its ready, running, and fault statuses.

Comparisons with Competing Products

Compared to modern variable frequency drives (VFDs), the ABB LWN2660-6EG 3BHL000986P7002 offers a more cost-effective solution for applications where only controlled starting (not continuous speed control) is required. Against traditional fixed-resistance or oil-immersed starter decks, it provides superior control, smoother operation, and higher reliability. Competing liquid rheostats from other manufacturers may offer similar functionality, but the ABB LWN2660-6EG 3BHL000986P7002 benefits from ABB’s global service network, proven application engineering expertise, and a design focused on durability and ease of maintenance. Its integration with ABB motor and protection devices can also be more seamless.

Selection Suggestions and Precautions

• Motor Compatibility: This starter is exclusively for slip-ring (wound-rotor) motors. Precisely match the starter’s rated rotor voltage and current to the motor’s nameplate rotor specifications.
• Load Characteristics: Accurately determine the load torque and inertia (WK²) to correctly size the ABB LWN2660-6EG 3BHL000986P7002 and configure its acceleration profile.
• Installation Environment: Ensure the installation site is level, vibration is within limits, and ambient temperature is suitable. Adequate ventilation and access for maintenance are crucial.
• Electrolyte Handling: Follow strict procedures for preparing and handling the sodium carbonate electrolyte solution, including safety precautions for personal protective equipment (PPE).
• Automation Interface: Plan the control interface with your PLC/DCS. The starter provides signals for start/stop, ready, running, fault, and often an analog output for resistance/position. Ensure your control system I/O matches these requirements.

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