Load abnormality detection apparatus performing accurate judgment of cause of abnormality

摘要

A load abnormality detection apparatus detects a load abnormality in at least one of a first rotational member and a second rotational member. An element acquisition part acquires a first control element and a second control element. A first comparison part compares the first control element with a first threshold value and also compares the first control element with a second threshold value larger than the first threshold value. A second comparison part compares the second control element with a third threshold value and also compares the second control element with a fourth threshold value larger than the third threshold value. An abnormality detection part detects a load abnormality in a load applied to at least one of the first and second rotational members based on results of comparison by the first comparison part and the second comparison part and identifies a cause of the detected load abnormality.