gefran TPD32-EV-500 series - Manual Tuning of Field Current Regulator

—————— TPD32-EV ——————
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Manual tuning of field current regulator
note! Inthemajorityofthecasesthedcmotorswithanindependentexcitationoperatewitha
directeld(Flux reg mode=Constantcurrent).Inthiscaseitisnotnecessarytooptimize
theregulatoroftheeldcurrentandtheregulatorofthearmaturevoltage.
Theoptimizationshowedbelow,referstodrivesoperatingwithconstantpowerrange(armatureandeld
mixedregulation).Inthesecasesitisnecessarytoconguratetheeldconverterforthisparticularuse.Seebelow.
note! Duringtheoptimizationoftheregulatoroftheeldcurrent,theconvertermustnotreceive
aStartcommand.
- Converterdisabled(novoltageonterminal12)
- MenuLIMITS/Fluxlimits:Flux current max =100%equaltotheratedeldcurrentofthemotor.
Flux current min =0
- Setat0.00theFlux IandFlux PparametersintheREGPARAMETERS/...menu.
- Measuretheeldcurrentviaananalogoutput.Tothispurposethevariable“Fluxcurrent”hastobeparam-
eterizedononeoutputandthevariable“Fluxreference”onanother(see“Input/Outputprogramming”).
- SelecttheFLUXREGULATIONmenu.
- Enable ux reg=Enabled(default)
- Flux reg mode=Voltagecontrol
- Enable ux weak =Enabled
- SetGen access=FluxreferenceandGen amplitude to70%oftheratedeldmotorcurrent(thistoallow
theovershootofthesystem).
-
IncreasethevalueoftheFlux Pparametertilltheovershootoftheeldcurrentislowerthan4%(Field curr).
- IncreasethevalueofFlux Iuntilltheovershootishigherthan4%,thenreduceitslightlylowerthan4%.
note! Becauseofthehightimeconstant,therateofriseoftheeldcurrentislimited.Theincrease
timewithoptimalscaleconditionscanbelastseveralhundredsofmilliseconds.
- Gen access =Disconnected
- Enable ux weak=Disabled
- SetFlux current min atthedesiredvalue
- Conguretheanalogoutputsonthebasisofyourneeds.
- Savethesettings.
Figures5.3.6.5...5.3.6.7showsomeexamplesoftuningoftheFluxregulator.
Figure 5.3.6.5: Above: Flux reference; Below: Flux current. The regulator
behavior is not good. Jumps are due to field changing.
Figure 5.3.6.6: Above: Flux reference; Below: Flux current. The reduction of
the field current depends on the field time constant. The reg has no influence.