| 摘要 |
PURPOSE:To always perform a proper starting control by setting acting points at the time intervals integer times as much as 1/2 cycle with a solenoid valve acting point above a designated level of an a.c. waveform of an a.c. electric signal as the base point. CONSTITUTION:With one point of an a.c. waveform where a solenoid valve comes to operable signal level as the base point, acting points for each solenoid valve are set at the time intervals integer times as much as 1/2 cycle of the a.c. waveform. If the a.c. waveform approximates to a sinusoidal waveform, the set acting points of the solenoid valve can be substantially at the same signal level. Accordingly, a command signal for the solenoid valve can cancel variations of acting time depending upon the a.c. waveform to always perform sequence control operation in a proper timing.
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