Speed sensor failure detection method and apparatus for an overs

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

1991-01-17

1992-08-18

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340670, 340671, 340679, 340657, 340661, 340441, 324161, 324163, 324166, G08B 2900, G01P 356

Patent

active

051403056

ABSTRACT:
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 failue is indicated. The apparatus may also be employed to detect a failure of, or loss of power to or within, one of the tachometers.

REFERENCES:
patent: 3450944 (1969-06-01), Burke
patent: 3803425 (1974-04-01), Carp
patent: 4161717 (1979-07-01), Hoover et al.
patent: 4365298 (1982-12-01), Sibley et al.
patent: 4777611 (1988-10-01), Tashiro et al.
patent: 4808920 (1989-02-01), Brauninger et al.
patent: 4876527 (1989-10-01), Oka et al.

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