GB1267723A - Bumpless transfer control system - Google Patents

Bumpless transfer control system

Info

Publication number
GB1267723A
GB1267723A GB4888569A GB4888569A GB1267723A GB 1267723 A GB1267723 A GB 1267723A GB 4888569 A GB4888569 A GB 4888569A GB 4888569 A GB4888569 A GB 4888569A GB 1267723 A GB1267723 A GB 1267723A
Authority
GB
United Kingdom
Prior art keywords
bellows
controller
pressure
output
manual
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4888569A
Inventor
Earl Arnold Beardsley
Hoel Lawrence Bowditch
Robert Claude Prescott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Systems USA Inc
Original Assignee
Foxboro Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foxboro Co filed Critical Foxboro Co
Publication of GB1267723A publication Critical patent/GB1267723A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/44—Automatic controllers pneumatic only
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
    • A45C11/24—Etuis for purposes not covered by a single one of groups A45C11/02 - A45C11/22, A45C11/26, A45C11/32 - A45C11/38
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/44—Automatic controllers pneumatic only
    • G05B11/48—Automatic controllers pneumatic only with auxiliary power
    • G05B11/52—Automatic controllers pneumatic only with auxiliary power in which the output signal represents a discontinuous function of the deviation from the desired value, i.e. discontinuous controllers
    • G05B11/54—Two-step controllers, e.g. with on/off action
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B7/00—Arrangements for obtaining smooth engagement or disengagement of automatic control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B7/00—Arrangements for obtaining smooth engagement or disengagement of automatic control
    • G05B7/04—Arrangements for obtaining smooth engagement or disengagement of automatic control fluidic

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Feedback Control In General (AREA)
  • Paper (AREA)

Abstract

1,267,723. Fluid-pressure servomotor systems. FOXBORO CO. Oct.6, 1969 [Nov.1, 1968], No.48885/69. Heading G3P. An automatic bumpless transfer system for process control has a secondary controller 23 maintaining the output signal from a process controller 11 equal to a signal from a manual controller 25, the secondary controller comparing the manual signal and the output signal from the process controller and providing an output 31 to rebalance the latter. The process controller receives a measurement signal 12 and a set point pressure signal 14 and is provided with integrating and output bellows 18, 19, the bellows 19 during automatic operation providing an output pressure which is applied through a line 20 to the process to be controlled and through a line 44 to a bellows 41 in a manual controller 25 so that a pointer 42 follows and indicates the output pressure. In manual operation, a knob 37 and a sector gear 36 adjust the output pressure from a nozzle 39 and the bellows 41 to supply a control pressure for the process through the line 20 and a set point pressure to a bellows 26 in the secondary controller 23 which is opposed by a measurement bellows 34 connected with the bellows 19. Integrating bellows 33 in the secondary controller are inter-connected with the bellows 18 of the process controller and with a bellows 30 providing a proportional action so that the manually regulated pressure appears in the bellows 19. A switch 27 connects a supply 28 to the bellows 30 to activate the controller 23 during manual operation and operates further switches 35A, 35B and 35C on changeover from manual to automatic operation. A reset capacity 45 in the process controller is disconnected by the switch 35B during manual operation.
GB4888569A 1968-11-01 1969-10-06 Bumpless transfer control system Expired GB1267723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77259368A 1968-11-01 1968-11-01

Publications (1)

Publication Number Publication Date
GB1267723A true GB1267723A (en) 1972-03-22

Family

ID=25095581

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4888569A Expired GB1267723A (en) 1968-11-01 1969-10-06 Bumpless transfer control system

Country Status (4)

Country Link
DE (1) DE1944011B2 (en)
FR (1) FR2022390A1 (en)
GB (1) GB1267723A (en)
NL (1) NL147265B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2627591B2 (en) * 1976-06-19 1981-04-16 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Control device for turbines with speed and power control
JPS5359190A (en) * 1976-11-08 1978-05-27 Hokushin Electric Works Air type adjusting meter

Also Published As

Publication number Publication date
DE1944011A1 (en) 1970-05-21
NL6916167A (en) 1970-05-06
NL147265B (en) 1975-09-15
DE1944011B2 (en) 1972-10-19
FR2022390A1 (en) 1970-07-31

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