| 摘要 |
PURPOSE:To render the operation time of a pump and a variable-speed motor uniform, by providing a 24-Hr time switch in a pump switching control circuit, and executing alternate operation only when a pump switching signal is produced within the setting time of the time switch. CONSTITUTION:When a system is started, it is detected at a routine 100 whether a 24-Hr time switch is opened or not. In case that the switch is opened, operation goes to a routine 401 for not executing alternate operation. On the other hand, in case that the time switch is closed, operation goes to the routine 200. When operation of a pump is not stopped, operation goes to the routine 200, routine 401 and END so as not to execute alternate operation. On the other hand, when operation of the pump is stopped, it is detected at a routine 300 whether alternate operation has been executed within the same period. From the result of this detection, it is determined whether alternate operation has been executed or not. |
