| 摘要 |
PURPOSE:To reduce a manufacturing cost of a switch and to effectively turn OFF a DC power source even if a control circuit is run away by providing a switch for turning OFF the power source in a current path for connecting a driving circuit to the power source., and providing a switch for turning OFF the power source in a current path of an exciting coil to which the DC power source voltage is supplied. CONSTITUTION:When a switch (SW) 22 for turning ON a power source is closed, a DC voltage is supplied to an amplifier 19 through a current path 21, a current path 26, i.e., an exciting coil 24 is energized, and the SW 22 is held in an ON state. That is, a solenoid valve 6 and a cleaning motor 8 are controlled to be energized or interrupted. Then, when an SW 25 for turning OFF the power source is closed, the coil 24 is energized, and hence the SW 22 is opened. That is, since the DC voltage from a DC power source circuit 14 is not applied to an amplifier 19, a microcomputer 14 cannot control to conduct triacs 7, 9, 10 through the amplifier 19. |
