| 摘要 |
<p>PURPOSE:To allow control of boiling by a constitution in which if the electrical connection cannot be detected due to a failure of the contact of a time switch when it becomes night time power supply time zone, the furnace is connected to the contact of the time switch at the moment of power supply start determined by a computation means. CONSTITUTION:When a failure is detected in a time switch 4 which limits the power supply time period for a furnace 2, the load is forcibly connected to the contact after a predetermined time has passed from the moment when the contact turns ON and the power supply starting time determined by a computation means 7 has come. Foreign substances stuck to the contact are broken away by arc discharge at the contact to allow the execution of prescribed boiling as well as a normal boiling control in subsequent operations.</p> |
