Vital switch control circuit

Details Vital switch control circuit Vital switch control circuit

1986-02-06

1988-07-12

Reeves, Robert B.

Railway switches and signals

Electric actuation

Motor systems

318293, B61L 1906, B61L 506

Patent

active

047564946

ABSTRACT:
A vital switch control circuit for a railroad switch machine includes a permanent magnet motor which is immune to stray or induced a.c. currents, and which is operable to either of two directions depending on the polarity of energy applied thereto. Switch-normal and switch-reverse contacts of a switch request relay logic circuit establish alternate positive and negative-current paths which are connected over a minimum number of line wires to a motor control contact arrangement and to a mechanically-interlocked, dual-coil, reversing contactor. The reversing contact is operable only above a specific d.c. voltage, therefore providing low-level d.c. immunity in case of grounding or cross-over conditions arising in the line wires. A reverse motor contact and a normal motor contact are used to alternately establish negative-current paths to the permanent magnet motor. Other reverse and normal motor contacts allow energization of the coils of the reversing contactor which have associated normal and reverse contacts, and over which the positive-current paths are established to the permanent magnet motor.

REFERENCES:
patent: 1996198 (1935-04-01), Gilson
patent: 2852667 (1958-09-01), Haines
patent: 3453426 (1969-07-01), Prentice
patent: 3601603 (1971-08-01), Hughson
patent: 3696244 (1972-10-01), Hamley et al.
patent: 3857077 (1974-12-01), Kasmer
Standard Handbook for Electrical Engineers, McGraw-Hill Book Company, 1978, p. 28-8.

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