gefran TPD32-EV-500 series - Page 305

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SetPID out scale sothat,alongwiththemax.analogvalueonAnalog input 2 (Feed-fwd PID =8500)and
withEnable PI PID eEnable PD PID =disable,Speed ref 1 isthesameat2550rpm.
Speed ref 1 willbesetinRPM x4,so:
PID out scale =(2550x4)/8500=1.2
SetPI central v sel =1.
SetPI central v 1 =1
IntheabsenceofacorrectioncarriedoutfromthePIblockoftheregulator,thelinespeedreference(Feed-
forward)mustbemultipliedby1andsentdirectlytothespeedregulatorofthedrive.
Thisapplicationoperatesbyusingproportionalcontrol.Thecorrectionwillbeindicatedinpercentageaccording
tothelinespeed,from0tothemaximum.
ProgramPI top limit andPI bottom limit sothatthemax.correctionofPIblockcorrespondsat20%ofline
speed.
PI top limit andPI bottom limit parametersarethemaximumandminimummultiplierfactorofFeedforward
value.
Atthemax.linespeeditwillcorrespond2550rpmofthemotor(max.feed-forward).
Max.correction=2550x20%=510rpm
2550+510=3060rpm ——>PI top limit =3060/2550=1.2
2550-510=2040rpm ——>PI bottom limit =2040/2550=0.80
whichwilltomultiplythesettingofPI central v 1(=1)by+20%(1.2)and-20%(0.80).
Withthisconguration,havingacorrectionproportionaltothelinespeed,thePIblockisnotabletoapplyten-
sionatspeed=0.Inordertoapplytensioninstopconditions,itisnecessarytouseonthePDblock.
Thegainsofthesinglecomponentshavetobesetwithloadedmachine;itispossibletostarttestswithvalues
belowindicated(defaultvalues):
SetPI P gain PID =10%
SetPI I gain PID =10%
SetPD P gain PID =10%
Incaseusethederivativecomponentforforcingtheregulatoroutputduringvelocitychangesofthesystem,
programmingforexample:
PD D gain PID =5%
PD D lter PID =20ms
Ifnotnecessary,keeptheseparameters=0.
Incaseitisnecessarytocarryoutareferencescascadeforanotherdrive,setPID output onananalogoutput,
forexample:
Analog output 1 / Select output 1= PID output
(withReal FF PID =10000count,Analog output 1 =10V).
note: Ifitisnecessary,asystemwiththeintegralregulationenabled,withfeed-forward=0,and
theneedtoapplytensionofthesystemwithnullerroralsowhenthemachineisstopped,
pleaserefertotheparagraph“GenericPID”.