Application of AC/DC 12-pulse Rectification Speed Control System for Ф219 mm DME Pipe Mill

In order to realize both piercing and rolling functions of the Ф219 mm multi-function DME pipe mill as contracted from Pakistan,the AC/DC 12-pulse rectification speed-control system for the Ф219 mm DME rolling mill is designed.Elaborated here in the article are the configuration of the drive system of the said mill.The main drive of the original piercing mill adopts a single-motor DC 12-pulse rectification speed control system,and the motor power is 2 500 kW,while the main motor system of the rolling mill proper adopts the double-winding motor,and the two main motor drives as a whole consist AC 12-pulse rectification speed control system and the motor power is 1 500 kW,each.The Siemens SINAMICS S120 and 6RA80 speed-control systems have the advantages of good control performance and high reliability,which meet the requirements of high quality and high precision for pipe production.Description here in the paper focuses on the design,characteristics,and key points of the installation and commissioning of the drive system.