Priority relay circuit with timer

Details Priority relay circuit with timer Priority relay circuit with timer

1995-10-18

1998-11-03

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Plural load circuit systems

Selectively connected or controlled load circuits

3071414, 307140, 361166, 361170, 361195, 236 20R, 236 48R, H02J 100

Patent

active

058313451

ABSTRACT:
A priority control system is disclosed for controlling multiple secondary load devices, and one priority load device. The secondary load devices can be randomly controlled at any time, except when the priority load device is activated, in which case, all secondary load devices are deactivated. The priority control system has a first relay which relays power to a plurality of secondary relays corresponding to the secondary load devices. The first relay is biased such that it normally provides power to the secondary relays. The first relay also has a priority position which is the non-biased position, for providing power to the priority load device. The first relay is activated by a priority control device which switches system power from the secondary relays to the priority load device. A priority timer circuit is provided to limit the time the first relay is in the priority position, regardless of a possible malfunction in the priority control device. This prevents a failure of the entire system in the event of a failure to the priority control or load devices.

REFERENCES:
patent: 4335320 (1982-06-01), Garver
patent: 4410135 (1983-10-01), Skyinskus
patent: 4564141 (1986-01-01), Montgomery et al.
patent: 5191520 (1993-03-01), Eckersley
patent: 5384490 (1995-01-01), Swartz, Jr.
patent: 5396395 (1995-03-01), Taninizu
patent: 5508878 (1996-04-01), Pecore
patent: 5626287 (1997-05-01), Krause et al.

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