Profilmatic Advanced profile control strategies - Voith

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ProfilmaticFor superior profile control resultsModuleJetModuleStepCD DeviationScanner PathResponseFunctionEdge LogicAutoMappingActuatorSplitting LogicModemSupportCompromiseControl LogicTemp DeviationCD ActuatorsTransport Delay+Scanning TimeProfileMeasurementRawProfilesSPC/SQC LogicControlProfileProfile ControlActuatorSetpointsMD DeviationScannerPaper Direction+/- 1sProfilmatic Control SoftwareMeanValueTimeProfilmatic functional control diagramProfilmatic StrategiesDistinguishing random noise from true profile variationBenefitsStatistical measurement techniquesProfilmatic® cross direction controlContinuous dynamic profileThese new control techniques haveUnique, continuous dynamicActuator splitting strategy providesOptional redundant Profilmaticsoftware comprises a family ofmapping ensures accurate align-revolutionized the speed andmapping eliminates alignmentoptimum control for a single qualitycomputers provide high reliabilityadvanced control strategies thatment of each actuator against eachperformance of Profilmatic profileerrors for optimum controlvariable using multiple CDand additional incremental results.deliver fast response and flatmeasurement zone. This eliminatescontrol and provide the foundationperformance.actuators.profiles.the effect of web wander orfor superior control results.The redundant computer mirrors thedifferential shrinkage that occurs atAdaptive tuning algorithms provideControl weighting strategy providestuning and setup factors of theProfilmatic sets new standardsgrade change or furnish change.Profilmatic control integrates withflat profiles with a fast response,the ability to factor a secondaryprinciple computer.in profile quality by employingthe OnQ Quality Control Systemwhile eliminating the need for gradequality variable into a primarystatistical process and qualityControl tuning is simplified withor other compliant QCS measure-grouping the control tuningquality variable.control (SPC & SQC) techniques.Profilmaticʼs adaptive tuningment platforms to control eitherparameters.The profile shape is quickly andalgorithms. These help eliminateVoithʼs Module actuators or actua-Fast, aggressive caliper profileaccurately determined fromthe need for complex grade-tors from third party suppliers.CD control modelling techniquesrecovery strategy following breaksunfiltered, high-resolution profiledependent tuning.eliminates traditional “saw-tooth”minimizes quality losses.measurements. By distinguishingactuator output array tendencies.random noise from true CDProfilmaticʼs control modellingSimple, efficient initial set-up andvariation, it eliminates slowtechniques help avoid “saw-tooth”Configurable set-up options aretuning takes less than one hour.traditional filtering methods of datacontrol tendencies, where adjacentincluded for controlling actuatorsacquisition.actuator outputs are runningthat are outside the measuredcounter to each other.profile.23

ProfilmaticAdvanced profile control strategiesModuleSteam DirectModuleSprayCD ActuatorsCD ActuatorsCD ActuatorsActuator OutputWeb WanderNon-Linear ShrinkageNon-LinearActuator SpacingExpected ResponseScannerScannerScannerActual ResponseData BoxesMeasurement Mapping ErrorData BoxesEdge Measurement Mapping ErrorData BoxesEdge Measurement Mapping ErrorNew Response ModeMapping errors: actuator position and data box measurementProfilmatic dynamic profile mappingControl Strategy OverviewFast Profile AcquisitionDynamic Profile MappingElimination of Saw-Tooth EffectsAutomatic ControlProfilmatic cross direction controlProfilmatic CD control analyzesA dynamic on-line mappingSaw-toothing can be eliminated inProfilmatic control recognizes theseProfilmatic CD Control provides ansoftware combines a family ofunfiltered, high-resolution profilealgorithm continuously determinestwo ways:patterns and optimizes the outputintegrated automatic tuning functionadvanced control strategies thatdeliver superior performance.The underlying strategies include:■■■■■■Fast control implementationRobust control designSimplified tuningFlexible applications modulesMinimum maintenanceSuperior resultsdata captured from the QCSsystem. A proprietary statisticalanalysis technique separatesrandom process noise from true CDprofile deviations. As no filtering isinvolved, the profile shape can bedetermined accurately and quickly.The OnQ QCS system with lownoisemeasurement contributestoward responsive control and flatand corrects mapping differencesbetween the measured profiledata boxes and actuator zones byanalyzing all the responses.Dynamic mapping compensates foruneven control zone spacing;nonlinear CD web shrinkage andCD web wander.This eliminates off-line mapping■■Correct mapping of the measurementzones to the actuatorcontrol zones.Employing control algorithms thataccurately model the process.The Profilmatic dynamic mappingalgorithm ensures that the correctprofile error is assigned to eachactuator zone.array to the actuators based onmechanical considerations andadjacent zone decoupling. Thisresults in adjacent actuator movementsbeing minimized, whilesafeguarding the machinery formaximum paper quality.that dynamically retunes its controlparameters based on processresponse feedback. It is a globalcontrol strategy that does notrequire set-up on a grade-by-gradebasis. This eliminates maintenanceand delivers consistent profilecontrol performance across thegrade range.Intuitive set-up procedures reduceCD profiles.utilities, added service expertiseProfilmatic process algorithmscommissioning time and eliminatecosts and compromised qualityaccurately model each CD actuatorthe need for grade dependentthrough incorrect mapping.in terms of its mechanical operationtuning and maintenance.and any process interaction (i.e.headbox slice beam mechanics andadjacent quality zone convolution).45

ProfilmaticAdvanced profile control strategiesModuleProModuleCoatActuators1 2 3Control Response ArraySheet PositionSheetEdgeMachineDirectionEdge Control OptionsSupervisory ControlManual ControlFixed OutputRatioed OutputAbsolute OutputSupervisory ControlManual ControlFixed OutputRatioed OutputAbsolute OutputSupervisory ControlManual ControlFixed OutputRatioed OutputAbsolute OutputEdge Actuator ControlModuleIRModuleThermActuator Splitting LogicCompromise Control LogicEdge Actuator Control TuningOptimized Actuator SetpointFast Caliper Profile ControlMaximum quality and productionProfilmatic control is capable ofThe following options are availableDepending on the application, itThe Profilmatic CD caliper profilebenefits can be achieved from twoweighting a secondary qualityfor those actuators that are outsidemay be required to operate actuatorcontrol provides unique capabilitiesactuators by using multiple CDprofile into the primary profile. Forthe sheet width:arrays at either a minimum orto improve quality and maximizeactuator control.Profilmatic decomposes a singlequality profile into short term andlong-term cross direction disturbancesbased on actuator spacing.These arrays are fed forward tocontrol each actuator system andexample, it might be desirableto take the moisture profile intoaccount when controlling the basisweight profile. The factoring canbe done for the total profile or forindividual control zones.■■■■Manual controlControlled to a fixed valueRelative control ratioed againstthe last measured zone insidethe sheetAbsolute offset against the lastmeasured zone inside the sheetmaximum value.This generally applies to steamboxesin order to maintain maximumproduction and remoisturizers toapply minimum re-wetting.Profilmatic set-up tables arecontrol response.ModuleTherm with Profilmaticcontrol incorporates a model-basedheat control algorithm. It initiallyapplies full heating power or coolinguntil desired zone temperature isreached. This significantly reducesdecoupled upstream. For example,provided for this purpose.the profile settling time followingif the first actuator is at a limit, ita break, grade change or processautomatically transfers the correc-disturbance.tion to the next upstream actuator.67