| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for driving a plurality of running fans capable of curbing the reduction in total air volume produced by fan motors even if some of the fan motors stop by the occurrence of abnormality. <P>SOLUTION: A device for driving a plurality of running fans comprises a rotational speed command operation unit 15 which gives a rotational speed command 16 to fan motor drive circuits 11 to 14 and receives an abnormal signal 17 from the fan motor drive circuits 11 to 14. The rotational speed command operation unit 15, when receiving the abnormal signal 17 from one of the fan motor drive circuits 11 to 14, gives increased values of the rotational speed command 16 to the remaining runnable fan motors among 21 to 24 so that the total air volume before abnormality occurrence produced by the fan motors 21 to 24 is not changed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
