How to provide compensation function for the control system of a rolling mill, and how to provide the mill compensation function for the changes that occur in the rolling parameters

摘要

A method providing a rolling mill with compensation for changes occurring in rolling parameters that result from changes occurring in mill speed. The rolling parameters are under control of actuators that are connected to receive control reference voltages from electrical controllers. The method includes the step of generating a compensation function that describes the actuator movement required to maintain a rolling parameter at a desired level as a function of mill speed. This compensation function is used during mill speed changes to calculate a compensation value change for each actuator, a change that is required to maintain the parameter at the desired level. The compensation value change is added to a current level of the compensation value to provide a new, updated compensation value. The updated value is converted to a voltage for control of the actuator, and the voltage is added to the reference voltage of an associated electrical controller to provide a total voltage reference for the actuator. The total voltage reference is effective to substantially eliminate the occurrence of error in the controlling process caused by a change in mill speed. IMAGE