basic position control system

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1 basic position control system 008 Enfield Technologies Enfield Technologies 3 Nutmeg Drive Trumbull CT USA toll-free North America fo@enfieldtech.com

2 Basic Position Control System Closed-loop Closed-loop Flow Position Control System (usg (usg LS-C10) Closed-loop Position Control System (usg LS-C1) LS-C1) position feedback signal command signal source position command signal (1) LS-C1 Controller valve command LS or Valve Lear Actuator with position feedback Legend : light blue, double le = Enfield Technologies components grey = other components green solid les = wirg dark blue les = plumbg yellow = ma objective components A-PS-VSB Vdc Power Supply 0-10 psig air supply load Notes: (1) Command signals should always be calibrated to actual feedback signal range * All grounds should be common to prevent system anomalies. Consider usg a power supply that separately regulates power to the device controller and the sensors 008 Enfield Technologies

3 ISO Valve Diagram Tutorial: Switchg Circuit Diagram Positiong systems are generally easy to understand Scenario 1: system at rest stable state with actuator extended /3 Scenario : shift valve to extended actuator further Scenario 3: shift valve to retract actuator extendg retractg position sensor double actg pneumatic actuator (air cylder) pneumatic connection dicator all blocked, no electrical connection dicator proportional pneumatic valve compressed air source port blocked exhaust to atmosphere exhaust to atmosphere 13 port blocked closed loop system controller valve controller amplifier (valve driver) Outside control loop same as Scenario 1 Outside control loop same as Scenario 1 set-pot controller ISO 119 symbols are often used fluid power circuit schematics, specialty design and simulation software, and as symbol libraries for CAD software When shown a simulation of a circuit, the symbol is shifted to dicate its active state as example Example above shows a basic pneumatic positiong system (electronics shown only itial scenario; unused paths grayed- for clarity) 008 Enfield Technologies 3

4 ISO Valve Diagram Tutorial: Symbol Description ISO 119 valve diagrams show how the valve functions its primary states of actuation. The location of the port labels dicates the valve s natural neutral state (un-actuated or restg state). (Port labels are typically numbers, but prior dustry practice was to use letters that assume use of the valve for a positiong system usg a double actg air cylder.) ISO diagrams do not necessarily represent actual construction which may be too complex for logic circuit design purposes. (But many cases, the ISO diagrams for Enfield Technologies valves are good approximations of actual construction). Flow paths when shifted away from motor Flow paths at restg state which is dicated by port numberg shown this box B A Flow paths when shifted toward motor Rectangle with ternal cross dicates external feedback and control occurs externally Long slopg le with arrow dicates facility for variability or adjustability (variability this case to dicate a proportional lear force motor which describes an electronically proportional valve this case) Sprg (sprg centered this case) Internal les with arrows dicate which ports are connected to create paths; double T symbol dicates that port is closed this condition arrows this case dicate that can be either direction Horizontal les runng length of boxes dicates contuously variable (fite termediate positions) which describes a mechanically proportional valve this case EB P EA Double horizontal le dicates directly connected shaft; arrows show direction of shaft motion (lear this case) Port identification (typically numbers, but letters also shown because of prior tradition still used by some); Restg state dicated by port labelg and extension of port tails to the side of the diagram for external terface; T s on all ports dicates closed center with all ports closed and no any direction when neutral position Circle with dicates an electric motor as a prime mover (lear force motor this case) [also defed IEC 617] 008 Enfield Technologies

5 Contact Information Enfield Technologies 3 Nutmeg Drive Trumbull, CT USA tel tel toll-free North America fo@enfieldtech.com General Information fo@enfieldtech.com Sales Group sales@enfieldtech.com Customer Service & Technical Service custserv@enfieldtech.com 008 Enfield Technologies

Mechatronics Engineering and Automation Faculty of Engineering, Ain Shams University MCT-151, Spring 2015 Lab-4: Electric Actuators

Mechatronics Engineering and Automation Faculty of Engineering, Ain Shams University MCT-151, Spring 2015 Lab-4: Electric Actuators Ahmed Okasha, Assistant Lecturer okasha1st@gmail.com Objective Have a