About rolling mill in metallurgy,last year we did one project in a stell plant in henan province last year, it is our regenerative drive application in 20-roll reversible mill project.
In total of 4 motors:
1 pcs of 1900kW main winding motor,
2 pcs 2000kW winding motors and one 250kW unwinding motor.
The input voltage of our inverter is 690VAC.
The rated frequency of the main coiling motor is 18.2hz, the maximum operating frequency is 56.6hz, the rated frequency of the coiling motor is 12.7hz, the maximum operating frequency is 48.2hz, the tension control accuracy is less than 1%, the maximum rolling line speed is 600m/min, and the rated voltage of the motor is 660V.
Our design for this project is 5pcs AFE +16pcs SMM inverter.