| 摘要 |
PURPOSE:To exchange parts in a preventive maintenance manner, and to obviate trouble stoppage due to deterioration of the parts by installing a part deteriorating detector and outputting an output signal from the detector to an information indicator mounted inside or outside a power converter as maintenance inspection information regarding the exchange period of the parts used. CONSTITUTION:Signals corresponding to the voltage applying time of each part or the operating time of each part are input from an input terminal 231 by a part deterioration detector 23. When the integrated time of a time integrating meter 233 reaches a value, where only the set value of a pre-information setter 235 is reduced, to the set time of an exposed lifetime setter 234, a comparator 236 detects the reduction of the integrated time and outputs pre-in formation to an output terminal 238. When the integrated time of the time integrating meter 233 is equalized to the set value of the expected lifetime setter 234, the equalization of the integrated time is detected by a comparator 237, and the excess of a partexchange period is output to an output terminal 239. These output signals are indicated by an information indicator 24, and pre-infor mation regarding the exchange of each part is output. |
