| 摘要 |
PURPOSE: An exhaust fan control device drives a discharging fan accurately and precisely depending on the combustion condition so as to make the combustion condition of a boiler without a hitch. CONSTITUTION: A control device comprises a manual key input part(20), a comparing and amplifying part(23), a maximum output part(40) and an output part(13). The manual key input part(20) is connected to an input end of a micro computer(11) and allows inputting different rotational frequencies depending on the capacity and the rotational frequency of a boiler. The comparing and amplifying part(23) is connected to the other input end of the micro computer(11) and receives the output signals from the manual key input part(20) and the speed control signals from the micro computer(11), compares and amplifies them, and outputs to a driving voltage control part(24). The maximun output part(40) is connected to the output end of the micro computer(11) and maximizes the speed of revolution of the exhaust fan in a motor driving part(31) with the motor driving voltage part(25) intervening. The output part(13) is connected to the output end of the micro computer(11) and generates an abnormality signal when the rotational condition of the exhaust fan is abnormal.
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