Elevators are among the most commonly used transportation systems in modern buildings, playing a crucial role in high-rise structures and daily life. The performance of an elevator—its speed, stability, and smooth operation—as well as the aesthetics of the cabin and the sound it makes when arriving at a floor, are key factors that people consider when evaluating the quality of a building. Among all elevator components, the door is one of the most critical parts. Its reliability, design, and safety directly impact the overall class and user experience of the elevator.
Traditionally, elevator doors have been controlled using a combination of a controller and a frequency converter. To enhance the performance and efficiency of elevators, Delta developed a specialized inverter for door machines—the 004M21B-D. Designed specifically for elevator door applications, this integrated control system not only improves functionality but also reduces costs for users. After extensive testing with tens of thousands of operations, the device has shown excellent reliability, earning high praise from customers.
The 004M21B-D offers a wide range of advanced features, including motor parameter self-learning, automatic door width calibration, multiple running modes (demo, terminal, and panel), adjustable speed and acceleration/deceleration settings, and real-time status display. It also includes pulse error prevention, customizable input/output signals, adjustable torque detection, manual positioning after power loss, fault self-recovery, and silent operation with high carrier frequency.
Since the early 20th century, elevators have been installed in China, initially imported from the West. Following the establishment of the People's Republic of China, the local elevator industry began to grow independently. With the reform and opening-up policy, foreign elevator companies entered the market, leading to rapid development. As living standards improved, so did the demand for safer, more stable, and energy-efficient elevators. In response to these needs, energy-saving frequency converters have become increasingly popular across industries, with Delta’s products standing out due to their efficiency and reliability.
Delta’s inverter technology has evolved rapidly over the years, gaining widespread use in sectors such as textiles, machinery, plastics, and paper. Today, Delta is recognized as one of the leading manufacturers in the inverter market in China. To further expand its reach, Delta focused on the elevator industry and developed the 004M21B-D inverter, tailored specifically for elevator door systems. This product significantly enhances elevator performance, offering great value to the industry.
With a commitment to innovation and technical excellence, Delta continues to develop solutions that meet the evolving needs of users. By improving elevator performance and contributing to better living standards, Delta plays a vital role in driving the growth of China’s elevator industry.
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