Application of new energy-saving soft starter (DWR series)

Energy conservation is a fundamental national policy in China, and the government has established a specific medium- to long-term energy-saving plan. Among the key initiatives, the energy-saving project for electric motor systems plays a vital role. As a result, reducing energy consumption and improving production efficiency have become top priorities for enterprises. Two main strategies are used: reducing the starting current and implementing reactive power compensation to achieve energy savings. The most effective way to reduce the starting current is by using variable frequency drive (VFD) technology or soft start solutions. Although VFDs are highly efficient, they are relatively expensive. Soft starters, on the other hand, offer a more cost-effective alternative, making them a popular choice in many industrial applications. This article focuses on the DWR series energy-saving soft starter, which is designed to optimize performance while minimizing costs. **Features of the DWR Series Energy-Saving Soft Starter** The new DWR series soft starter incorporates advanced digital circuitry, ensuring high stability and reliability. Its main circuit is equipped with high-voltage, high-power devices that provide strong resistance to overvoltage and overload conditions. It supports frequent starts and stops without causing arcing, thus extending the lifespan of connected equipment. Key features include: - **Energy Efficiency**: Reduces energy consumption with smooth start-up, eliminating grid and equipment stress. - **Flexible Installation**: No phase sequence requirement, though phase sequence protection can be set. - **Adjustable Start-Up Parameters**: Starting voltage ranges from 0% to 80%, with start-up time adjustable between 2 to 60 seconds. - **Multiple Start Modes**: Supports ramp voltage start, ramp plus kick start, and ramp plus current limit start. - **Comprehensive Protection**: Offers fault diagnosis, phase failure protection, three-phase imbalance detection, overcurrent, overheating, overvoltage, and undervoltage protection. - **Soft Stop Option**: Prevents pressure shocks in high-rise water supply systems. - **Robust Control Circuit**: Uses industrial-grade single-chip microcomputers and optocouplers for strong anti-interference capability. - **High Reliability**: Long service life, low failure rate, and reduced maintenance costs. **Working Principle** The soft starter operates through a combination of three circuit boards and a main circuit. The power supply board steps down the 380V three-phase AC to 10V DC using an isolation transformer. This DC power is then rectified and filtered to supply the control and display boards. The power board also provides a synchronous signal for the control board. The thyristors are triggered based on signals from the control board, adjusting their conduction angle to regulate voltage. The control board uses an STC89C52 microcontroller, along with optocouplers and integrated circuits, to generate precise timing and pulse signals. The main circuit consists of six high-power thyristors or MTC modules, temperature sensors, varistors, and current transformers. These components work together to manage voltage fluctuations and protect the system from surges. **Kit Installation** The soft starter kit includes a central controller and a main circuit. The central controller houses the digital display panel, control board, and power board. The main circuit can be either modular or discrete. For modular installations, MTC thyristor modules are recommended, with specific ratings based on motor power. Heat sinks must be selected according to motor size and installed with thermal grease for optimal heat dissipation. **Function Settings** Factory settings are pre-configured for immediate use. Users can adjust settings by pressing the "Set" button and entering the desired function code using the "+" and "-" keys. Once the correct value is selected, the "Enter" key confirms the adjustment. **Usage Instructions** To use the soft starter, connect the input terminals R, S, T to a 380V power source and the output terminals U, V, W to the load. A 220V/200W bulb can be used as a temporary load. Press the start button, and the bulb should gradually brighten. Ensure all bulbs have the same brightness and measure the output voltage to confirm it matches the input. After testing, disconnect the load and connect the actual motor. Adjust the starting voltage and time based on the load requirements—typically 10% voltage and 10 seconds for no-load conditions. This comprehensive guide ensures users can install, configure, and operate the DWR series soft starter effectively, maximizing energy savings and system longevity.

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Hebei Jinbiao Construction Materials Tech Corp., Ltd. , https://www.pvcarportsystem.com