Situation
The automatic component replacement and retrofit projects focus on the local replacement of imported AC drives in industrial rolling mill systems. They cover three typical scenarios: Hot rolling, cold rolling in a single rack, and cold rolling in a plate strip. The original system depends on imported equipment, which causes long purchase time, high costs, and complicated maintenance. The retrofit solution ensures cost reduction and efficiency while ensuring production continuity through seamless replacement, structural compatibility, and performance optimization.
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The purchase cycle is long and expensive.
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Traditional modifications require modification of cabinet structure, re-wiring, or modification of the host machine program. The stop time is long
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The original system communication protocol is old and sensitive to interference. Speed control accuracy of the rolling mill (such as cold-rolling jacket control of the plate belt) is affected.
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The cabinet structure needs to be modified. Re-wiring or modifying the host machine program for a long stop time.
Solution details
Solution ①: Main drive, auxiliary drive, basic rectifier + inverter; 11–1500 kW (17 main drives) 1.5 times heavy load mode with a rated torque amplitude of 150%; Encoder forms FVC closed-loop vector control mode to ensure speed fluctuation and speed stability accuracy；Solution ②: Regenerative rectifier + Inverter replacement; Rolling speed: 200/400 m/min, maximum rolling force: 1200 T; Main drive: 900 kW*4；Solution ③: Full-line main drive such as unwinder, S-roller, and sleeve; Feedback rectifier + inverter; Power 690 V2700, 400 V3.7 to 355 kW。
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