gefran TPD32-EV-...-4B - Droop Function

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6.7.4 Droop function
-
+
low pass filter
Zero
T
To Speed
reference
From digital setting or
analog input
T current ref
Load comp
0%
Droop limit
1500 rpm
Droop filter
0ms
Droop gain
0%
Enable droop
Figure 6.7.4.1: Droop compensation
SPEED REGULAT
Droop function
[696] Droopgain[%]
[697] Drooplter[ms]
[698] Loadcomp[%]
[700] Drooplimit[FF]
[699] Enabledroop
Parameter description No.
Value
Standard
Conguration
min max
Factory
American
Factory
Standard
Droop gain [%]
696 0.00 100.00 0.00 0.00
Droop lter [ms]
697 0 1000 0 0
Load comp [%]
698 -200 +200 0 0 *
Droop limit [FF]
700 0 2*P45 1500 1500 **
Enable droop
Enabled(1)
Disabled(0)
699 0 1 Disabled(0) Disabled(0)
*Thisparametercanbeassignedtooneoftheprogrammableanaloginputs.
** Thisparametercanbeassignedtooneoftheprogrammabledigitalinputs.
TheDroopfunctionisusedwhenacurrentbalancingbetweentwodrivesisrequired.Atypicalsituationiswhen
twomotorsaremechanicallycoupledandhavetorunatthesamespeed.If,becauseofadifferentcharacteristic
ofthetwospeedregulators,oneofthemotorsisdriventorunatahigherspeed,itwillbeoverloadedandthe
secondmotorwillworkasabrake.TheDroopfunctionpermitstoavoidthisbadfunctioningbyaddingacom-
ponentintheinthespeedreferenceofthedrive,whichisproportionaltotheactualloaddifferenceofthedrives.
Theeffectisthebalancingofthetwomotorcurrent.
Droop gain Droopfunctiongain.ItisdenedasapercentageoftheratiobetweenSpeed base value
antthedifferenceLoad comp - T current ref.ThismeansthatwhenthedifferenceLoad
comp - T current refis100%andDroop gain=100%,thespeedreferencecorrection
signalisequaltoSpeed base value.
Droop lter Filtertimeconstant
Load comp Loadcompensationsignal.Itistypicallyequaltothe“master”drivecurrent,butitcan
alsobeassignedtoaprogrammableanalogoutput.ItisdenedasapercentageofIdn.
Enable droop Enabled Droopfunctionenabled.
Disabled Droopfunctiondisabled.
Droop limit Itdenesthespeedreferencecorrectionrangeinwhichthedroopfunctionisactive.
Thevaluetobeenteredisbasedonthefactorfunction.
(FormoredetailseeFigure6.7.1“Speedregulator”).