| 摘要 |
PURPOSE:To control the temperature of hot water at optimum gains without varying control gains by detecting the frequency of a power supply for a combustion control system and arithmetically determining the optimum number of revolution to the frequency when the power supply is turned ON. CONSTITUTION:When a power supply for a combustion control system is turned ON, a power supply frequency detecting section 311 detects the frequency of the power supply, and outputs a frequency information (k) to a phase arithmetic section 312. The phase arithmetic section 312 memorizes and holds the frequency information (k) while arithmetically determining a phase control angle, where a fan motor 4 is brought to the optimum number of revolution, on the basis of the frequency information (k) and the aimed number of revolution (e), and outputs the phase control angle to a fan motor driving section 125 as a tripper signal (j). Accordingly, the fan motor 4 is turned and driven by the optimum number of revolution required for controlling the temperature of hot water regardless of applied power supply frequency. |
