Speed sensor failure detection method and apparatus for an...

Details Speed sensor failure detection method and apparatus for an... Speed sensor failure detection method and apparatus for an...

G - Physics

01

P

G01P 21/00 (2006.01) G01P 3/60 (2006.01)

Patent

CA 2059452

AEST1RACT OF THE II~1VENTION An apparatus for detecting speed sensor failure in an overspeed protection device is disclosed, The apparatus comprises a plurality of tachometers having outputs for indicating the speed of rotation of a machine relative to plural setpoints. If the comparison indicates that certain conditions exist, then a sensor failure is indicated. The apparatus may also be employed to detect a failure of, or loss of power to or within, one of the tachometers.

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