Delayed turn-on and turn-off control circuit

Details Delayed turn-on and turn-off control circuit Delayed turn-on and turn-off control circuit

1975-12-01

1978-06-27

Scott, James R.

Electricity: motive power systems

Automatic and/or with time-delay means

Time or with time-delay means

318452, 318453, 318447, 307141, 3071414, H02P 104

Patent

active

040977919

ABSTRACT:
A delayed turn-on and turn-off control circuit for an electric motor includes a motor relay having an electrical actuator and a normally open motor contactor which is connected in series between the motor and an electrical power source for running the motor when the electrical actuator is energized. A normally non-conductive electrical switching device is serially connected between the electrical actuator and the power source. A turn-on delay circuit is responsive to closing of a normally open motor start switch and produces an electrical signal to render the electrical switching device conductive only after a predetermined lapse of time following the closing of the motor start switch, thereby energizing the motor. A turn-off delay circuit is responsive to opening of the motor start switch and produces an electrical signal to render the electrical switching device nonconductive only after a predetermined lapse of time following the opening of the motor start switch, thereby causing the motor to be deenergized.

REFERENCES:
patent: B451396 (1976-04-01), Nurnberg
patent: 3325657 (1967-06-01), Corey
patent: 3582732 (1971-06-01), Kovalsky
patent: 3755695 (1973-08-01), Krick et al.
patent: 3784881 (1974-01-01), Van Horn et al.
patent: 3814948 (1974-06-01), Schuchmann et al.
patent: 3814950 (1974-06-01), Adams

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