gefran TPD32-EV-CU series - Page 307

—————— Instruction manual ——————
307
Analog input 2 / Select input 2 = PAD 0
SetDigital input 1 asenablinginputofthePIblockofthePID
Digital input 1 = Enable PI PID
SetDigital input 2 asenablinginputofthePIblockofthePID
Digital input 2 = Enable PD PID
Set Digital input 3 asenablinginputofthecalculationfunctionofinitialdiameter.
Digital input 3 = Diameter calc
Set Digital output 1 assignalling“phaseofcalculationofstartingdiameter“.
Digital output 1 = Diameter calc st
Parameters
SetSpeed base value equaltotheratedspeedofthemotor.
Speed base value =3000rpm
SetPID source asPAD 0.
(PAD 0 hasbeenusedassupportingparameterofthefeed-forwardreadingonAnalog input 2)
ForPID source, settheparameternumbertowhichitwillbeassociated,choosingitfromthelistofthepara-
graph10.2.“List of high-priority parameters”(PAD 0 hadthedecimalnumber503).Toobtainthecorrectvalue
itmustbeaddedthedecimalnumber8192(xedoffset):
PID source=(8192+503)=8695
SetGain source andPID out scale sothat,themax.analogvalueonAnalog input 2 andwithoutthePIDcor-
rection(Enable PI PID eEnable PD PID =Disable),theperipheralspeedoftherollinconditionsofminimum
diameter(core)isthesameofthemax.linespeed.
Calculationofthemotorspeedintheconditionabovementionned:
  Vp=πxΦminxωxR
where:
Vp=peripheralspeedofthecoil=linespeed
Φ
min
=min.diameterofthecoil[m]
ω=angularspeedofthemotor[rpm]
R=reductionratiomotor-coil
  ω=Vp/πxΦ
min
xR=400/(πx0.1x0.5)=2546rpm=about2550rpm
Mantaininga15%marginastothesaturationlimitoftheregulator(10000count),itisnecessarytosetPID
source Gain sothatFeed-fwd PID reaches,alongwiththemax.analogvalueonAnalog input 2,85%ofits
max.value.
WhenananaloginputissetonaPADparameter,thiswillhaveamax.value+/-2047.