Control arrangement fail-safe timing circuit

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

1975-06-09

1977-02-01

Wayner, William E.

Refrigeration

Automatic control

Time or program actuator

62193, 318452, F25B 3100, G05D 2332

Patent

active

040055850

ABSTRACT:
A fail-safe timing circuit energizable in response to a starting signal for activating a system, such as 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 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: 3321669 (1967-05-01), Rhodes
patent: 3931560 (1976-01-01), Willson

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