| 摘要 |
PURPOSE:To obtain the control circuit for the blower which arbitrarily sets residual operation and can be continued for a prolonged time by arbitrarily setting the residual operation time of the blower after pushing an operation shut-down switch. CONSTITUTION:When an operation switch 2 is turned ON, a relay 9 is conducted, an (a) contact 11 is closed, a self-holding circuit is formed, the contact 7 of a relay 6 is closed, and the blower is operated. When the shut-down switch 3 is turned OFF, the realy 9 is not conducted, and the (a) contact 11 is opened, thus alos opening the self- holding circuit while closing the (b) contact 13 of the relay 9. A time limit relay 1 is conducted at that time, a (b) contact 17 is closed until time designated passes in the time limit relay 1, and a relay 10 is maintained under the state of conduction. Consequently, the relay 6 is brought to the state of conduction while the (a) contact 14 of the relay 10 is left as it is closed, and a motor 8 is turned even after the shut-down switch 3 is turned OFF. On the other hand, the (b) contact 17 of the time limit relay 1 is opened after time designated passes, the relay 10 is also brought to the state of non-conduction, and the self-holding circuit is opened. Accordingly, the (a) contact 14 is opened, the relay 6 is also brought to non-conduction, the motor 8 for the blower is stopped and residual operation is completed. |
