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—————— Instruction manual ——————

299

6.16.3.9 Procedure of calculation for initial diameter

Thecalculationisbasedonthemeasurementofthedancermovementfromthelowerfullrangepositiontoits

centralworkingposition,andonthemeasurentoftheangularmovementofthecoilduringthedrawingphase.

Forthatreason,duringthisperiod,makesurethatthegearmantainingthematerialblocked.Forthisreasonit

isnecessarytoenabletheregulationofthenip-rolldrivewithspeedreference=0.

Iflinenip-rollsarecontrolledbydancersorloadcells,itisnecessarytocarryoutthediametercalculationofthe

winders/unwindersrst,thenthegear.

TheparameterPI central v sel mustbesetat0toavoidPI output PID beingsetautomaticallyatapredenedvalue.

BringingthedigitalinputprogrammedasDiameter calctoahighlogiclevel(+24V),ifthedriveisenabled,

willstarttheprocedures.Duringthisphase,theparametersEnable PI PID andEnable PD PID areautomati-

callydisabled.

Theregulationveriesthesignalcomingfromthedancerpotentiometer.Ifthisishigherthanwhatisalready

setinMax deviation,themotorbeginsfollowingthespeedreferencesetinPositioning speed inordertowind

thematerialandbringthedancertoitscentralpositionofworking.

ThepolarityofthereferenceassignedtoPositioning speed willbewinder/unwinderequaltotheoneworking

asawinder.

Iftheinitialregulationveriesthatthesignalcomingfromthepotentiometerofthedancerislowerthanwhat

alreadysetinMax deviation,themotorstartsrunningwithspeedreferencesetinPositioning speed inorderto

unwindthematerialandbringthedanceronthepointidentiedbyMax deviation,atthispointthereference

willbeinvertedtobringthedancertoitscentralposition.

Whenthedancerhasreachedthecentralposition,theparameterPI output PID willbesetatavalueinversely

proportionaltothediameterandthedigitaloutputDiameter calc st,thatindicatestheendofdiametercalcula-

tion,willbebroughttohighlogicallevel.

Atthispoint,ifEnable PI PID and/orEnable PD PID areenabled,thesystempassesautomaticallyinregulation.

ForthisreasongenerallythedigitalinputsprogrammedasDiameter calc andEnable PI PID and/orEnable

PD PID willbebroughttohighlogiclevelatthesametime.

TheoutputsignalDiametercalcstcanbeusedtoresetthecommandDiameter calc (thiscommandwillbe

activatedontherisingedgeofthedigitalinput).Forthatreason,itmustbebroughttohighlogicallevelafter

thesupplyoftheregulationpartofthedriveandresetoncetheinitialcalculationphasehasnished.

ThevalueofPI output PID willbecalculatedwiththefollowingformula:

PI output PID =(Min diameter x PI top lim)/Valueofthecalculateddiameter

TheparametersPI top limit andPI bottom limit inthemenuPI controls havetobesetaccordingtothemax.

andmin.diameteroftheroll.Forbetterexplanation,pleaserefertoparagraph6.16.3.10“Applicationexamples”.

gefran TPD32-EV-...-4B User Manual

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