gefran TPD32-EV-500 series - Page 314

—————— TPD32-EV ——————
314
Parameters
SetSpeed base value equaltothemotornominalspeed.
Speed base value =3000rpm
SetPID source asRamp output.
ForPID source settheparameternumbertowhichitwillbeassociated,choosingitfromthelistofsection10.2.
“List of high priority parameters”(Ramp output hasthedecimalnumber113).
Toobtainthecorrectvalueitmustbeaddedthedecimalvalue8192(xedoffset):
PID source=(8192+113)=8305
SetPID source Gain sothatFeed-fwd PID, alongwiththemaximumvalueofRamp output (corresponding
tothemaximumvalueoftheanaloginput2),reaches100%ofitsvalue=10000.
TherampreferenceanditsoutputautomaticallyacquiretheirmaximumvaluefromthesettingofSpeed base
value.Thereforeitmustbetakenintoconsiderationthateachwritingorreadingofanyparameterconcerning
thespeedisdenedasRPM x4.
So:PID source Gain =maxFeed-fwd PID /(Speed base value x4)=10000/(3000x4)=0.833
SetPID target asSpeed ref 1.
note: Whentherampfunctionisenabled,Speed ref 1 isnotavailable.Inordertomakeitavailable
itisnecessarytosettheparameterEnable ramp =Disable.(Thissettingallowstheworking
oftherampblock,butdisconnectsitsoutputfromthespeedreference1).
ForPID target, settheparameternumbertowhichitwillbeassociated,choosingitfromthelistofthesection
10.2.“List of high priority parameters”(Speed ref 1 hasthedecimalnumber42).Toobtainthecorrectvalueit
mustbeaddedthedecimalvalue8192(xedoffset):
PID target=8192+42=8234
SetPID out scale sothatthemaximumanalogvalueonAnalog input 2 (Feed-fwd PID =10000)andwith
Enable PI PID andEnable PD PID =Disable,Speed ref 1 wereequalto3000rpm.
TheSpeed ref 1 mustbesetasRPMx4,then:
PID out scale =(3000x4)/10000=1.2
SetPI central v sel =1.
SetPI central v 1 =1
InabsenceofcorrectionperformedbythePIblockoftheregulator,thelinereferencespeed(Feed-forward)must
bemultipliedx1andsentdirectlytothespeedregulatorofthedrive.
Inthisapplication,theregulatormakesaproportional-integralcontrol.
SetPI top limit andPI bottom limit inordertoobtainmaximumcorrectionofthePIblockequaltothe100%
ofthespeedreference.
Theparameters,PI top limit andPI bottom limit couldbeconsideredasthemultiplierfactorrespectively
maximumandminimumofthefeed-forward.
PI top limit =1
PI bottom limit =0