| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional system, wherein it takes time for recovery, for it is frequently difficult to decide what has caused the stoppage of an apparatus such that whether the stoppage of an apparatus is caused by voltage ripple or caused by abnormality, such as faults, etc. of the apparatus itself, etc. when the apparatus stops. SOLUTION: The voltage and the current to an apparatus to be determined are detected; when the detected voltage V amounts to a set value Vx, a stored current value I<SB>1</SB>before drop is checked; when the checked current value is not less than a set current value Ix, it is compared with a present current value I<SB>2</SB>; and when I<SB>2</SB><Ix, the stoppage of the above apparatus to be determined is determined as being one accompanying the lowering of the instantaneous voltage drop. COPYRIGHT: (C)2006,JPO&NCIPI
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