Control circuit for underground mining equipment

Details Control circuit for underground mining equipment Control circuit for underground mining equipment

1978-06-08

1980-08-12

Salce, Patrick R.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361 27, 361106, H02H 708

Patent

active

042176220

ABSTRACT:
Mining equipment of the type operably dependent on the voltage and/or the phase of electric current is isolated from electric supply mains by an OFF switch in a control circuit before a current supply relay drops out. The OFF switch and an ON switch are coupled in a monitoring conductor which supplies current to a photo-electronic coupler. An output signal from the coupler is delivered to a battery fed integrator to provide a control signal to an output relay for a switch in the current supply line on mining equipment. The ON switch is bridged by a normally closed switch coupled to a relay which is responsive to operating current fed to the machine. In a second embodiment, thermal sensing elements for motor windings on the machine provide a signal to battery fed relays to open a normally closed switch in a circuit bridging the photo-electronic coupler.

REFERENCES:
patent: 3136926 (1964-06-01), Smith
patent: 3196316 (1965-07-01), Crom
patent: 3335324 (1967-08-01), Buckeridge
patent: 3555356 (1971-01-01), Kaiser
patent: 3665251 (1972-05-01), Buckeridge
patent: 3771020 (1973-11-01), Smith
patent: 4011483 (1977-03-01), Meadows
patent: 4143287 (1979-03-01), Biggs

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