CONTROLLER FOR UPSTREAM WATER LEVEL IN FLEXIBLE FILM DAM

摘要

PURPOSE:To raise the stability and response of a controller for the height of dam by using a system in which the deviation value between the set value and detected value of the upstream water level is added to the hourly integral and differential values in adequate proportions, and a regulating signal is sent out to a fluid supply and discharge means. CONSTITUTION:After raising a rubber dam 1, a motor-driven valve 15 for air exhaustion and a motor-driven valve 16 for air supply are closed, a motor- driven valve 12 is opened, and an upstream water level setter 30 is set up to a desired set value hs. In case where the detected value hu of upstream water level is smaller than the set value hs, voltages Vhs and Vhu for each are put in a comparator 31, and the deviation obtained in the comparator 31 is added to the hourly integral and differential values in adequate proportions in a proportion-integral-differential arithmetic unit 32 to obtain a target Hs for the rubber dam 1. The output VHS is compared with the detected output VH of dam height, and the compared value is sent out to a regulating valve 18 and a compressor 20 to increase the height of the dam. When the detected value hu is greater, the compared value is sent out to the regulating valve 18 to discharge air.