Control arrangement fail-safe timing circuit

Details Control arrangement fail-safe timing circuit Control arrangement fail-safe timing circuit

1974-03-01

1976-07-20

Smith, Jr., David

Electrical transmission or interconnection systems

Switching systems

Switch actuation

H01H 700

Patent

active

039708640

ABSTRACT:
A fail-safe timing circuit energizable in response to a starting signal for activating a system, such as a fuel ignition system or an air conditioning system, includes a first switching circuit responsive to the request signal to activate the system to commence its operation tentatively, a time-out circuit responsive to the starting signal for generating a time-out signal after a predetermined time delay interval, a circuit responsive to a system variable such as the establishment of a flame in a fuel ignition system or the sufficient increase in oil pressure of a compressor in an air conditioning system becoming a predetermined condition, such as the flame occurring or the compressor oil pressure achieving a given desired value, for preventing the time-out circuit from generating its time-out signal, and a second switching circuit for causing the first switching circuit to de-activate the system in response to the time-out signal. As a result, the system is prevented from operating in an undesirable or unwanted manner should the system variable not reach the predetermined condition within the timing interval.

REFERENCES:
patent: 3270799 (1966-09-01), Pinckaers
patent: 3291183 (1966-12-01), Fairley
patent: 3441356 (1969-04-01), Walbridge
patent: 3649156 (1972-03-01), Conner
patent: 3726630 (1973-04-01), Potts
patent: 3770364 (1973-11-01), Walbridge
patent: 3832123 (1974-08-01), Walbridge

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