Under the overarching trends of industrial energy conservation, consumption reduction, and intelligent upgrading, high-performance motor start-up control has become a key focus for numerous manufacturing enterprises. Recently, Changsha ATA’s independently developed… ATA QB-H10 The series of high-voltage solid-state soft-start cabinets have been successfully commissioned in a centralized air‑compression energy‑saving retrofit project at a major domestic paper‑making enterprise. 3 All high-voltage soft-start cabinets were successfully commissioned under load on the first attempt, earning high praise from customers for their rapid delivery and outstanding performance. 

Project Challenge: Starting Challenges Under High-Inertia Loads 

To advance its energy-saving and consumption-reducing technical upgrade project for centralized compressed-air supply, the paper mill selected internationally renowned Atlas centrifugal compressors as its core air‑supply equipment, pairing them with multiple high‑power, high‑voltage motors. Centrifugal compressors are characterized by large inertia; if started directly, they would generate… 5 ~ 7 Impulse currents exceeding the rated current not only pose a serious threat to the stability of the plant’s power grid but also degrade the mechanical life of equipment. Consequently, selecting a high‑performance, highly reliable motor soft‑starter has become a critical factor in the success or failure of the project. 

After multiple rounds of technical comparisons and proposal reviews, the customer ultimately selected Changsha  ATA QB-H10 The series of high-voltage solid-state soft-start cabinets, totaling 3 The system is configured to match air compressor units of different power ratings, handling the full range of starting and control tasks for all high-voltage motors. 

Ultra-fast delivery: 4 Complete installation and commissioning within the day. 

The project was time‑critical and demanded high standards. Upon arrival of the Otto equipment at the site, installation commenced immediately. With close collaboration between the client and the on‑site team, all tasks—from cabinet positioning and primary/secondary wiring to control‑logic verification and parameter tuning—were carried out efficiently and in an orderly manner. 

Upon entering the critical load‑testing phase, ATA’s technical team focused on the centrifugal air compressor. “ No-load start-up, intake valve closed ” In accordance with the process requirements, the built-in control strategy of the system precisely matches the load characteristics and sequentially initiates the starting sequence for the three motors. All three high-voltage soft-start cabinets successfully brought the loads online on the first attempt. —— The motor accelerates smoothly from standstill to its rated speed, with steady torque output and no mechanical shocks. The on-site current waveform shows that the starting current remains within the customer‑specified limits throughout the entire start-up process, while the grid voltage dip is significantly better than expected. All backend monitoring data are normal. 

From the entry of technical personnel to the completion of all loaded commissioning, the entire process took only 4 Heavens, the debugging cycle that once took several weeks has been drastically shortened. The customer’s project manager commented on ATA’s products… “ Ready to use out of the box ” Its delivery capabilities have been highly recognized. 

Technological Advantages 

This successful commissioning fully validates ATA QB-H10 The four core technological advantages of the series of high-voltage solid-state soft-start cabinets are: 

• Low starting current and minimal grid disturbance. . Through advanced thyristor voltage regulation and constant current control / Voltage ramp control technology ensures precise regulation of motor starting current, completely eliminating voltage flicker disturbances to sensitive loads in the plant and safeguarding the safety and stability of the power distribution system. 
• Smooth soft start, protects the host machine. The output torque increases smoothly and steadily, completely eliminating mechanical shocks and torsional stresses, thereby effectively protecting the bearings, gearboxes, and couplings of centrifugal air compressors and significantly extending the service life of critical equipment. 
• Stable performance, one-click commissioning. The device features highly integrated hardware and software, with built-in comprehensive protection functions against overvoltage, undervoltage, overcurrent, phase sequence errors, and thyristor overheating, along with a user-friendly digital interface. Predefined standard parameter sets tailored for centrifugal air compressor loads eliminate the need for repeated parameter adjustments on-site, truly enabling… “ Power is on—success! ”。
• Wide compatibility and easy integration 。10kV Voltage level and rated power coverage reach 220-50000kW Its wide operating range ensures seamless compatibility with high-pressure air compressor units of varying power ratings. The cabinet features a compact design, with straightforward installation and wiring, significantly reducing both installation complexity and time. 

Industry Significance 

In the centralized compressed-air supply technology upgrade project for this paper mill, ATA QB-H10 The series of soft‑starter cabinets, with their outstanding performance in achieving successful one‑time load commissioning and an exceptionally short commissioning cycle, have minimized disruption to the operating plant. Since going into service, the entire air‑compressor system has exhibited quiet, smooth startup, and the power distribution system has maintained excellent operational data, laying a solid foundation for ongoing optimization aimed at further energy savings and consumption reduction. 

This successful application marks a milestone for Changsha ATA QB-H10 The series of high-voltage solid-state soft-start cabinets has once again demonstrated its excellence in the field of high-power centrifugal air compressors for the paper-making industry. With… “ High performance, high reliability, rapid delivery ” As a core competitive advantage, ATA will continue to deliver smarter, more reliable soft-start solutions for industrial energy‑saving upgrades and centralized gas supply systems, helping more enterprises achieve safe, efficient, and environmentally friendly production.