| 摘要 |
PURPOSE:To prevent faulty combustion due to reduction in voltage of a combustion controller driving power supply by interrupting the operation of a burner if the voltage of the power supply is below the specified value. CONSTITUTION:The power supply voltage detecting circuit 67 of a power supply 3 consists of a regulator 19, a comparator 51 and a reference voltage determining resistor, and the voltage drop detecting level is set higher than the reset detecting level of a micro computer 17. When the detecting circuit 67 detects a drop of power supply voltage, the micro computer 17 turns off all external load control, interrupts the operation and has a trouble signal transmission output 36 transmit an error signal to a system controller to display an error sign. Thus the operation with reduced power voltage will not continue and faulty combustion and abnormal overheating is prevented and safety is improved. |
