| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve control method comprising a new means to align the point of origin of a stepping motor without using a butting method. SOLUTION: The valve position (N3) of the stepping motor is confirmed by an electronic sensor, and the motor is rotated in the minus direction (CCW direction) for the number of steps (N3) corresponding to this position so that the initial alignment of point of origin is established. If the electronic sensor is erroneous, the initial alignment of the point of origin is made by the butting method. |
