FAN MONITORING SYSTEM
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United States of America Patent
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app pub date -
Dec 4, 2017
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Dec 14, 2016
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Abstract
A fan monitoring system includes a first fan, a complex programmable logic device and a fan status notification module. The first fan operates according to a signal of first fan rotating speed and generates a first impulse signal having a first impulse frequency value. The complex programmable logic device counts a time period of continuously receiving the first impulse signal having the first impulse frequency value remaining consistent. The complex programmable logic device determines that the first fan operates abnormally and generates a first fan error signal when determining that the first impulse frequency value reaches a first peak and the time period of continuously receiving the first impulse signal having the first impulse frequency value remaining consistent is greater than a first predetermined time value. The fan status notification module displays a first fan error status notification when receiving the first fan error signal.
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