| 摘要 |
PURPOSE:To stop the electric power supply to a power source transformer in a control device by detecting an abnormal condition by a method wherein an electric power in supplied to an electric power supply device via a NC contact of a main solenoid valve opening relay during the definite time for exhausting a remaining gas, and is supplied to the control device via a contact of a small quantity fuel supply relay during a pilot flame forming time and after the pilot flame forming time. CONSTITUTION:In case that a main solenoid valve driving relay RMV9 is normal condition, an electric power is supplied to an electric power source transformer 6 via a contact NC of the main solenoid valve driving relay RMV9 during the definite time for exhausting a remaining gas, then the electric power is supplied to the electric power source transformer 6 via a contact 2 of a relay RSV10 and a contact 4 of the relay RMV9 during the pilot flame forming time, and via the contact 2 of the RSV10 during a normal burning time after the pilot flame forming. In case that the contact of the relay RMV9 is melted or the contact is made ON caused by a trouble, the contact 4 of the relay RMV9 is made ON side. When the electric power supply is started by an electric power supply device 12 under above condition, the electric power is not supplied to the electric power source transformer 6, a control circuit 11 is not operated, the driving operation is stopped. Thereby, an abnormal detonating condition caused by the large amount of fuel supplying into a burning chamber can be prevented during the pilot flame forming time. |
