Servo drive operated by a pressure medium

Details Servo drive operated by a pressure medium Servo drive operated by a pressure medium

1995-08-09

1997-07-29

Hepperle, Stephen M.

Fluid handling

Pressure modulating relays or followers

Jet control type

1374875, 13762561, F16K 3142

Patent

active

056513852

ABSTRACT:
A device for operating a servo drive having a positioning element controlled by a pressure medium. The device includes an electrical control unit generating a control signal based upon the position of the positioning element, a pre-control system connected to receive the control signal through an electrical control path and a main control system controlled by the pre-control system to operate the servo drive by moving the positioning element. A switching element is positioned between the electrical control unit and the pre-control system and opens the electrical control path prohibiting the transmission of the control signal upon detecting operation malfunction. Upon opening of the control path, the pre-control system acts to switch the main control system into a deventilation mode and said positioning element is moved into a predetermined "fail safe" position deventilating the positioning volume of the drive.

REFERENCES:
patent: 4855659 (1989-08-01), Riensche
patent: 5126934 (1992-06-01), MacFadyen
patent: 5197328 (1993-03-01), Fitzgerald
patent: 5431182 (1995-07-01), Brown

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