| 摘要 |
PROBLEM TO BE SOLVED: To provide a symptom diagnosis system, a symptom diagnosis method, and a symptom diagnosis device with which it is possible to efficiently detect abnormality in an apparatus.SOLUTION: A symptom diagnosis system has: a current value acquisition unit 111 for acquiring an AC current value inputted to a motor; a frequency analysis unit 112 for converting, at each time of day, the acquired current value into a frequency spectrum in which current intensity and frequency are correlated; an abnormality determination value calculation unit 113 for calculating, at each time of day, a frequency width at As when As=m×At (0<m<1) where At represents current intensity corresponding to a frequency, out of the frequency spectrum, that corresponds to an analysis frequency that is the apparatus frequency of a current value inputted to or outputted from an apparatus × N (N=1, 2, 3, etc.); and a determination processing unit 114 for determining whether or not the frequency width is wider than a frequency width at normal time, and determining that the apparatus is in an abnormal state when the frequency width is wider than a frequency width at normal time, as a result of the determination.SELECTED DRAWING: Figure 2 |
