VALVE CONTROLLER UNIT AND ITS ORIGIN RETRIEVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a highly convenient valve controller unit for periodically and automatically executing the origin retrieval of the closing position of a valve and a projection type display device. SOLUTION: This valve controller is provided with an origin retrieving means 3 which supplies a driving pulse PD for driving a valve 7 to a closing direction D to a stepping motor 5 configuring a pulse motor, and after detecting the step-out of the stepping motor 5, supplies a predetermined driving pulse PD for driving the valve 7 to the closing direction D to the pulse motor, and supplies a specified driving pulse PD for driving the valve 7 in an opening direction U to the stepping motor 5 in order to retrieve an origin (O) of the closing position of the valve 7. COPYRIGHT: (C)2005,JPO&NCIPI