| 摘要 |
PURPOSE:To prevent a speed control coil from being burnt by misconnection, by connecting a surge absorber and a resistance element in parallel to the speed adjusting coil. CONSTITUTION:A proper connection of a circuit 9 on power source side to terminals 14, 15 and 16 will constitute a driving system of a vibrating fan, etc. At this time, if power voltage is applied to a speed adjusting coil 2 by misconnection, then a surge absorber ZNR will be conducting and excess current will flow to a current fuse 12. The current fuse 13 will blow as a result and no excess current will flow to the speed adjusting coil 2 enough to burn it off. Consequently, the breakage of speed adjusting coil 2 caused by misconnection can be prevented. Moreover, it can be pointed out that the fusing of the current fuse 12 will show the existence of misconnection. A driving system entirely suitable for the ventilating fan, etc., will be in hand by the correction of misconnection and replacement of the current fuse 12. |
