| 摘要 |
PURPOSE:To prevent the unsafe operation of an equipment by providing the second overheat preventing device constituted of a discrete circuit separately from an overheat preventing function by a computer on the computer provided with the overheat preventing function of the equipment. CONSTITUTION:When a microcomputer 12 runs away from some external causes and an overheat preventing function in the microcomputer 12 is not operated, the output of a temperature detecting device 5 reaches the divided voltage between a divided resistor 16 and a divided resistor 17 and a hysteresis resistor 18 by the operation of the second level comparing device 13 and the second overheat prevention level setting device 15, then the output of a comparator 14 is reversed from ground to open, a transistor 21 is turned off from on, a driving circuit 11 receives this off signal and stops the oscillation of an inverter circuit 10, and the heating of an equipment is stopped. Such on/off heating state is repeated, and the oil temperature of the equipment does not reach the ignition temperature. |
