4.6　Electrical Drive and Automation Equipment

4.6.1　The main driving system and auxiliary driving system of the rolling mill shall be AC variable speed control systems.

4.6.2　A medium slab rolling line should be equipped with automatic instruments for temperature，width，thickness，and pressure measurement，etc.

4.6.3　The production line shall employ a two-stage automation system.The basic automation control system should exercise zonal control according to the process flow；the process control system shall be configured centrally and by zones according to the requirements for production process consistency，distribution，and control.If the conditions permit，a three-level computer system should be used for the rolling plant，and a four-level computer system should be used for the plant（or organization）.