COMBUSTION CONTROLLING DEVICE
Two temperature controllers, a first temperature controller and a second temperature controller are provided, and combustion in the furnace is controlled based on a first signal and a second signal outputted therefrom. Doing so enables safe control of the furnace even when a failure occurs in one of the temperature controllers.
1 . A combustion furnace controlling device according to the present invention comprising:
a first temperature monitoring portion measuring a temperature within a combustion furnace, comparing that temperature to a specific temperature, and outputting a first signal in accordance with the comparison result;
a second temperature monitoring portion measuring a temperature within a combustion furnace, comparing that temperature to a specific temperature, and outputting a second signal in accordance with the comparison result; and
a control portion controlling the combustion of the combustion furnace based on the inputted first signal and second signal.
2 . A combustion furnace controlling device as set forth in claim 1 , wherein:
the first temperature monitoring portion outputs a first signal if the temperature within the combustion furnace is greater than a specific temperature;
the second temperature monitoring portion outputs a second signal if the temperature within the furnace is greater than a specific temperature; and
the controlling portion eliminates the processes at startup if the first signal and the second signal are inputted.
3 . A combustion furnace controlling device as set forth in claim 1 , wherein the controlling portion comprises:
a diagnosing portion diagnosing whether or not a fault has occurred in the first temperature monitoring portion or the second temperature monitoring portion in accordance with whether or not there is switching between outputting and stopping the first signal or the second signal when a switching signal, switching between outputting or stopping the first signal or the second signal, is outputted to at least one of the first temperature monitoring portion and the second temperature monitoring portion.
4 . A combustion furnace controlling device as set forth in claim 3 , wherein: the diagnosing portion diagnoses that a fault has occurred in the first temperature monitoring portion or the second temperature monitoring portion to which the switching signal was outputted if a specific time interval has elapsed from the point in time that the switching signal was outputted until the point in time wherein the first signal or the second signal switches between being outputted and being stopped.
5 . A combustion furnace controlling device as set forth in claim 3 , wherein: the controlling portion stops the operation of the combustion furnace when there has been a diagnosis, by the diagnosing portion, that a fault has occurred in the first temperature monitoring portion or the second temperature monitoring portion.