Patent ID: 6235178
Filing Date: 2001-05-22
Classification: C25D,G05B

Abstract:
A method for coating a metal strip with a coating metal using a coating plant, comprising the steps of:passing the metal strip through an electrolyte in an electroplating cell, a current flowing through the electroplating cell, the current effecting a deposition of a layer of the coating metal on the metal strip;controlling the current using a monitor controller so that the layer of the coating metal deposited on the metal strip is a predetermined thickness, the monitor controller including a process model and a controller part;controlling the current as a function of a coating weight mean value using a dynamic low-pass filters;determining if a state of the coating plant is altered, the state of the coating plant being altered when a new metal strip enters the coating plant or when the layer of the coating metal deposited on the metal strip is less than a predetermined minimum thickness; andadjusting a time constant of the controller part to the altered state when the state of the coating plant is determined altered.