FAN CONTROLLER
PROBLEM TO BE SOLVED: To solve a problem that temperature in the housing increases when a fan is thrown into a hot-line or removed therefrom due to failure or maintenance when the inside of the housing is cooled by means of a plurality of fans to cause erroneous operation of a circuit element or abn...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PROBLEM TO BE SOLVED: To solve a problem that temperature in the housing increases when a fan is thrown into a hot-line or removed therefrom due to failure or maintenance when the inside of the housing is cooled by means of a plurality of fans to cause erroneous operation of a circuit element or abnormal stop before completing shutdown processing. SOLUTION: Fans 11 and 12 are provided with relay contact circuits 13 and 14 for switching the power supply voltage of the fans, and resistance circuits 15 and 16 for voltage regulation. Relay control circuits 17 and 18 detect abnormality of the fans 11 and 12 from the operating state thereof and switches the relay contact circuit 14, 13 of a fan on the sound side to increase the driving voltage of the fan thus preventing the air supply function from lowering. Abnormality detection of the fan includes detection of the voltage or current of the fan and inserting/removing state of the fan. |
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