Title:
CONTROLLER FOR TEMPERATURE OF HEATING FURNACE
Document Type and Number:
Japanese Patent JPS5920015
Kind Code:
A
Abstract:
PURPOSE:To allow the temperature to fall to a temperature for keeping warm in a short time, by outputting the operation output value from an independently provided manipulated variable setter when the deviation from a temperature measured value is larger than a prescribed value and switching the output to the output from a PID operator when this deviation is smaller than the prescribed value. CONSTITUTION:An intra-furnace temperature set value 10 is set to the temperature for keeping warm and is detected by a lower limit alarm device 13. The output of a deviation operator 12 is detected by an upper limit alarm device 14. AND between a switch signal of an interlock 15, which determines whether minimum flow setting is performed or not through the logic operation, and output signals of alarm devices 13 and 14 is operated in an AND gate 16, and a switch 18 is switched to the side of a terminal (a) to the side of a terminal (b) by this gate output. Thus, the signal to an output processing part 19 is switched to the signal obtained by allowing a signal from a preliminarily set minimum setter 20 to pass through the side of the terminal (b) of a switch 23. The minimum set value of the setter 20 is set to a minimum set value where combustion in the furnace is continued.
Inventors:
HISAYOSHI GI
HOSHINO SABUROU
HOSHINO SABUROU
Application Number:
JP12895882A
Publication Date:
February 01, 1984
Filing Date:
July 26, 1982
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G05B11/42; G05D23/19; (IPC1-7): G05B11/42; G05D23/19
Attorney, Agent or Firm:
Akio Takahashi
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