Control system for actuators which can be separately energized a

Details Control system for actuators which can be separately energized a Control system for actuators which can be separately energized a

1977-08-15

1980-04-22

Hix, L. T.

Electrical transmission or interconnection systems

Plural load circuit systems

Selectively connected or controlled load circuits

236 1E, 165 26, G05D 2300

Patent

active

041996909

ABSTRACT:
A control system for actuators which can be separately energized. The controller of the system has a two-position control unit and a three-position control unit and is followed by constant current source circuits, a stepping switch unit with threshold switches having a stepped reference voltage, as well as a logic circuitry interconnecting the stepping switch unit and the two-position control output. Prevention of overshoot or undershoot is achieved by means of additional logic circuitry interconnecting the switches at the positive and negative output of said three-position control unit, said two-position control output, and said first mentioned logic circuitry between the stepping switch unit and two-position control output. In this manner overshoot can be prevented by quickly de-energizing the actuator, which was last energized, when the actual value in the controlled system closely approaches the set-point or reference value.

REFERENCES:
patent: 3844425 (1974-10-01), Keterson et al.

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