| 摘要 |
PURPOSE:To subject the contents of abnormality to hysteresis treatment by incorporating said contents of abnormality in a writable, erasable and preservable storage means and by indicating them with an indicating means. CONSTITUTION:An inverter apparatus drives a load motor 4 from AC power via a converter circuit 2 and an inverter circuit 3. This abnormality indication circuit is composed of an over-voltage detection circuit 5, a base driving circuit 6, an overcurrent detection circuit 7, and a control circuit 101 by an arithmetic circuit 8 and others. Also, said indication circuit is equipped with a paging system 13 and a storage element 14, and said paging system 13 has display units 22, 23 of figures and the like with light-emitting elements to indicate arbitrary contents other than command operation frequencies by said light- emitting elements. Further, said storage element 14 preserves contents written in the arithmetic circuit 8 even after an inverter power has disappeared by the breaking of a switch 1A and reads out said contents after the recovery of power. Thus, it is made possible to determine the abnormalities of said inverter occurring in the past.
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