Proportional pressureregulators andvalves VPPM, VPPE, …

1 Proportional pressure regulators and valves VPPM, vppe , MPPE, MPPES, MPYEand the newVPPM-MPAFor correct pressure and precise regulationInfo 241 Precise, infinite regulationof pressure and flowInfo 241 Subject to change 2008/072 Internet: pressure correctly plus easy installation and precise regulationFast dynamic response, high repetition accuracy, short switching times, linearcharacteristics and stable regulation these features can significantly improveproduct quality by precise adjustment and control of the process variables. Theseproportional pressure regulators provide infinite adjustment of pressure andthereby the force or flow, enabling the user to preset pressures, piston speedsand rotational speeds at the press of a sturdy with 3 variable via fieldbusVPPM the new in Proportional pressure right parameters for each applica-tion simply choose the correct regu-lator characteristic from 3 presets atthe press of a button.

2 Specialists areno longer required. Reliable regula-tion due to two-stage control circuitwith multi-sensor individualityOurmodulesfortheVPPM arepre-cisely adjusted to your requirements for electronic, pneumatic andmechanical systems with or flanged version, current con-trolled, voltage controlled, connectionto fieldbus/Ethernet via CPX basic performance to high-techproduct something completely controlIntegrated sensors for optimumregulation results and , whichmeans no pressure drifting duringtemperature vppm reports the pressurereached as an electrical signal. It canalso diagnose a specified value thatcannot be reached. Almost all valuescan be remotely controlled and moni-tored via or LCD versions of proportionalpressure regulators1 Connector plugM12, 8-pin2 Status LEDsPower/Error33presetLEDsfast/universa l/precise43 pushbuttons for simpleoperation (choice of presets)5 Display of current pressure6 Presets can be selected viabuttons or digital inputs7 Adjustable pressure range8 Different switch modes for switchoutput (diagnostics function)9 Choice of units (bar, kPa or psi)aJBardisplayforidentifyingdynamic processes2008/07 Subject to change Info 2413 Internet: applicationCan be put to universal use.

3 WhetherAdvantages for commissioning andmaintenanceOnly from Festo reliable regulationwith multi-sensor controlpit is accuracy or speed that is requiredat the press of a button, or processeswhere force and pressure must beregulated precisely and flexibly,reliable regulation behaviourguarantees optimum results. Festo plug & work :noadjustmentof the control circuit required No need to store specialattachments Immediate commissioning Shorter retooling times Remote control regulationbehaviour (presets rapid,universal and precise) Can be adjusted to the applicationindividually via presets Choice of several pressure ranges Process-optimised cylinder speed Flexible, adjustable flow rates Special adaptationpossiblefastuniversalprecise SpecialadaptationpossibleWithout multi-sensor controlgenerally causes deviceI/O modulesdigital/analogueEnd plateFieldbus nodeTechnology moduleFront End ControlCompact vision systemSBOxInfo 241 Subject to change 2008/074 Internet.

4 On CPX/MPA Proportional technology in threefold linkingVersatile integration intoautomation systemsTheMPAvalveterminalwithfieldbusco nnection communicates in manydifferent languages and is able tocommunicate with the fieldbussystems and automation systems ofleading configuration using CPX macroSystematically more reliable andquicker planning and configurationwith CPX modules the CPX macrolibrary for the electrical CAE flexibility due to individualpressure zonesNew technologies and innovativeproducts enable many pressure control valve integratedin a valve terminal offers remote con-trolled pressure zone regulation andtherefore more flexibility in many pro-yypcesses. For example, a proportionalcontrol valve enables several staticpressures to be set with low airconsumption and by service and commissioningThe small, convenient handheld CPX-MMI facilitates data requisitions,configuration and diagnosticfunctions for CPX/MPA on-site inplain text, without interfaceManifoldblockIdentification platePush-in fittingSeparatingsealMPA1: Manifold blockfitted with 4 valvesIntegrated vppm proportionalpressure regulatorSupply plate with flat platesilencerMPA2: manifold blockfitted with 2 valvesIntegratedpressure sensorEnd plateElectricmoduleManual pressure regulatorwith manometerSub-base valveManual overrideBetter performancethanks to technology modulesCPX-FEC provides a programmablevalve terminal remote controller onthe fieldbus or Ethernet as a pre-processing unit for decentralised,autonomous subsystems.

5 The CPX-CPIinterface permits centralised anddecentralised pneumatic/electricalsystems side-by-side leading toshorter cycle times and lower integration of the latest SBOxvision system in IP65 on CPX/MPA simpler I/O operation, on CPI interfaceor via flexible and innovative M128-pinCageClamp M84-pinM125-pinmetalthreadInnovation thanks to functionintegrationThe serial linking within the MPAmakes this possible: vppm -MPA pressure control valve Pressure ranges .. 2 .. 6 .. 10 bar flow up to 1400 l/min 3 presets can be accessed programmable switching points pressure range can be set temperature compensation highly accurate cascade regulationthanks to multi-sensor technologyExtremely adaptable connectiontechnology2008/07 Subject to change Info 2415 Internet: 241 Subject to change 2008/076 Internet: pressure regulators VPPMG eneral informationVPPMA ssemblyrepositionable by 180 In-line valveH-rail mountingLED indicatorsDisplaySub-base valveManifold blockCompressed air supply at both endsWorking linesVenting at both endsPlug socket with cableControl elementsInnovativeVersatileReliableEasy to mount Multi-sensor control(cascade control) Diagnostics Choice of regulation characteristics Temperature compensated High dynamic response High repetition accuracy Modular product system Individual valves (in-line valve) Manifold valves (sub-base/flangevalve)

6 Various user interfaces LEDindicators LCD display Adjustment/selection buttons A choice of valves with differentpressure ranges Pressure range can be modified onthe valve Choice of different setpointspecifications Current input Voltageinput Integrated pressure sensor with independent output Open circuit monitoring Pressure is maintained if thecontroller fails Manifold block H-rail mounting Individually via mounting bracket QS fittings-V-New2008/07 Subject to change Info 2417 Internet: pressure regulators VPPMG eneral informationVPPM on the valve terminal MPA24 VSerial dataInnovativeVersatileReliableEasy to mount Multi-sensor control Diagnostics via bus Choice of regulation characteristics High dynamic response 2 accuracy levels Pressure zone regulation Multiplexing For all common protocols As an individual pressure regulator As a pressure zone regulator Choice of 3 valves with differentpressure ranges 3 pressure ranges (presets) can beset via the bus Internal or external compressed airsupply possible Long service life LED display for the operating status Pressure is maintained if the supplyvoltage fails Fast troubleshooting thanks to LEDson the valves and diagnostics viafieldbus Ease of servicing throughreplaceable valves Simple replacement of the valves Tested units Easy extension of the valve terminal-V-NewInfo 241 Subject to change 2008/078 Internet.

7 Pressure regulators VPPMG eneral informationLayout of a control circuitClosed-loopcontrol elementFinal controlelementControlledsystemMeasuringd eviceClosed-loop controller (integrated electronics)Comparator(Valve piston)(Valve output and alldownstream components)Disturbance z( leakage)Controlled variablex (pressure)Referencevariable w(setpointvalue)Feedback signal rSystem deviation eLayoutMethod of operationThefigureshowsaclosed-loopcontr olcircuit. The reference variable w(setpoint value, 5 volts or 8 mA)initially acts on a comparator. Themeasuring device sends the controlledvariable x value (actual value, 3 bar) to the comparator as afeedback signal r. The closed-loopcontrol element detects the systemdeviation e and actuates the finalcontrol element. The output of thefinal control element acts on the con-trolled system. The closed-loop controlelement thus attempts to compensatefor the difference between the refer-ence variable w and the controlledvariable x by using the final process runs continuously sochanges in the reference variable arealways detected.

8 However, a systemdeviation will also appear if thereference variable is constant but thecontrolled variable changes. Thishappens when the flow through thevalve changes in response to aswitching action, a cylinder movementor a change in load. The disturbancevariable z will also cause a systemdeviation. An example of this is whenthe pressure drops in the air disturbance variable z acts on thecontrolled variable x all cases, the regulator attempts toreadjust the controlled variable x tothe reference variable control (cascade control) of the VPPMD iaphragmpressureregulatorPilot controlstageMain stageWorkingpressureregulatorWorkingvolu mePilot solenoidcoilsSetpointvalueActualvalueSen sor 1 Sensor 2 Cascade controlControl precisionUnlike conventional direct-actingregulators, with multi-sensor controlseveral control circuits are nested in-side each other. The overall controlledsystem is divided into smaller sub-controlled circuits that are easier tocontrol for the specific control significantly im-proves control precision and dynamicresponse in comparison with single-acting Subject to change Info 2419 Internet: pressure regulators VPPMG eneral informationTerms related to the Proportional pressure regulatorHysteresisLinearity errorThere is always a linear relationshipwithin a certain tolerance between thesetpoint value entered and the pres-sure output.

9 Nevertheless it makes adifference whether the setpoint valueis entered as rising or falling. Thedifference between the maximumdeviations is referred to as perfectly linear progression of thecontrol characteristic of the outputpressure is theoretical. The maximumpercentage deviation from this theor-etical control characteristic is referredto as the linearity error. The percen-tage value refers to the maximumoutput pressure (full scale).Response sensitivityRepetition accuracy (reproducibility) barThe response sensitivity of the devicedetermines how sensitively one canchange, adjust, a smallest setpoint value differencethat results in a change in the outputpressure is referred to as the responsesensitivity. In this case, repetition accuracy is the marginwithin which the fluid output vari-ables are scattered when the sameelectrical input signal coming fromthesamedirectionisrepeatedlyadjusted . The repetition accuracy isexpressed as a percentage of themaximum fluid output offsetPressure range adaptation1 3456789102012345678910If, for example, a vppm cannot bevented for safety reasons, the mini-mum pressure can be increased fromthe zero point.

10 The smallest setpointvalue is then assigned an outputpressure of 5 bar, for example, andthe largest setpoint value an outputpressure of 10 bar. Zero suppressionis automatically switched off if zerooffsetting is the delivery condition, 100% set-point value equals 100% fluid outputsignal. Pressure range adaptation oradjustment enables the fluid outputvariable to be matched to the point mAxmbarIn practice there exists the possibilityof residual voltage or residual currentat the setpoint input of the vppm viathe setpoint point suppression is used so thatthe valve is reliably vented at asetpoint value of 241 Subject to change 2008/0710 Internet: pressure regulators VPPMP roduct range overviewFunctionVersionConstruc-tionalPn eumaticconnectionNominaldiameterPressure regulationSetpoint value input Page/Internetdesign1, 2, 3pressurise/exhaustgrangeVoltage typeCurrent typeDigital[mm][bar] PressureWith LEDregulatorsPilot actuateddiaphragmvalveGx6.