Control system with timer redundancy

Details Control system with timer redundancy Control system with timer redundancy

1987-09-10

1989-05-23

Scott, Samuel

Combustion

With indicator or inspection means

Correlated with action of condition responsive burner control

431 24, F23N 520, F23N 524

Patent

active

048325945

ABSTRACT:
A fail safe control circuit for supplying gas to a burner is disclosed and includes a plurality of timers, two of which set upper and lower bounds on a window or acceptable time interval during which a third timer must issue a control signal for that signal to be valid. The timers are operated from at least two different sources of timing signals so that a failure of either source of timing signals as well as a malfunction of any one of the three timers will result in an invalid control signal and the control will lock out to preclude burner operation.

REFERENCES:
patent: 4239478 (1980-12-01), Tanaka et al.
patent: 4319873 (1982-03-01), Michaud et al.
patent: 4384844 (1983-05-01), Yamamoto et al.
patent: 4384845 (1983-05-01), Hinton et al.
patent: 4445841 (1984-05-01), Tanaka et al.
patent: 4518345 (1985-05-01), Mueller et al.
patent: 4605863 (1986-08-01), Toudo et al.
patent: 4695246 (1987-09-01), Beilfuss et al.

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