| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an overload detection device without stop of opening/closing of a shutter curtain when next opening/closing the shutter curtain even when the number of revolution of a motor of a shutter opening/closing machine increases temporarily greatly in comparison with the number of revolution during an immediately preceding time of opening/closing. <P>SOLUTION: Correction means of learning values in an overload detection device comprises: abnormal value detection means which compares the number of revolution of a motor during opening/closing of a shutter with a stored learning value (the number of revolution during an immediately preceding time of opening/closing) in association with the position of the shutter curtain, and determines that the number of revolution is an abnormal value if it is greater than a learning value to which the number of revolution of the motor during shutter opening/closing corresponds, by a predetermined value or more; and means for correcting the number of revolution determined to be the abnormal value to a less number of revolution (≥the corresponding learning value) and acquires a corrected learning value. The corrected learning value is used to update an immediately preceding learning value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
