| 摘要 |
PROBLEM TO BE SOLVED: To prevent the interruption of a water feed function by enabling the automatic change-over into the operation of an auxiliary pump even if a power supply circuit inside an inverter which corresponds to a normally operated pump causes a failure due to damage. SOLUTION: When a normally operated pump 2A is operated automatically through a general-purpose inverter 1A, a failure detection means 5 which detects whether a power supply circuit inside the general-purpose inverter 1A causes a failure or not based on the reduction of the number of revolutions of the normally operated pump 2A or the reduction of an output voltage of the inverter 1A is provided on a controller 4 side, and the operation is automatically changed over into the operation of an auxiliary pump 2B based on the detection operation. |
