Process control system using a two wire remote control system

Details Process control system using a two wire remote control system Process control system using a two wire remote control system

1974-05-13

1976-09-07

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318624, 318678, G05B 1128

Patent

active

039796540

ABSTRACT:
A process control system including a control station responds to the departure of a process variable from a set point to provide a direct current signal in a two-wire transmission line in a direction dependent upon the direction of such departure and time-proportioned in accordance with the magnitude of the departure. A solid state power relay that accepts the d-c signal at a single pair of input terminals includes high-current rating triacs that are adapted selectively to be fired by triggering pulses generated in response to the d-c signals alternating current power from a source of alternating current to a heavy-duty motorized valve for operation of the latter in one direction or the other and at a speed in accordance with the signals.

REFERENCES:
patent: 3483455 (1969-12-01), Klysa et al.
patent: 3487458 (1969-12-01), Martens et al.
patent: 3652912 (1972-03-01), Bordonavo
patent: 3686557 (1972-08-01), Futomura
patent: 3766409 (1973-10-01), Shuey

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