TheSmartstart6000
InstructionManual:Smartstart®6000IMI0042revK
Page3
BasicSoftStarterOperation
TheZenerSmartstart®6000isareducedvoltagecontroller
designedforstartingstandard3Phaseinductionmotors.
Theunitissolidstate,usingamicroprocessortocontrol
inverseparallel(backtoback)pairsofSCR’s.
AnSCR/thyristorisasemiconductordevicethatlatches
whentriggered.Oncetriggereditallowscurrenttoflow
inonedirectiononlyandturnsoffatzerocurrent.
ThefiringangleoftheSCR’sarecontrolledtoachievethe
desiredaccelerationofthemotor.
SoftStartersprovidethefollowingbenefits:
1. Reducedstressesandwearonthe
mechanicsofthesystem
2. Reducedstartingcurrents
3. Minimizevoltagedipsonthesupply
4. LoweredPeakdemandcharges
5. Eliminatebeltslippageonfans
6. Smoothaccelerationofmotor/load
SMART‐TORQ®TorqueControl
TheZenerSmartstart®6000incorporatesaclosedloop
torquecontrolsystemtoprovidebettercontrolover
starting&stopping3phaseinductionmotors.
Conventionalvoltagerampcontrolsystemstypically
producelowtorqueatlowspeeds.Whenstarting&
stoppingvariabletorqueloads(e.gPumps)thiscan
resultsinaveryrapidaccelerationordecelerationwitha
nonlinearchangeinmotorspeed.
TheSmartstart®6000seriesovercomestheseissuesby
regulatingthetorqueinthemotortomatchtheload
typeduringtheacceleration&deceleration.This
essentiallyallowsaconstanttorquetobeproducedin
themotor.Thecontinualmonitoringofthemotor
characteristicsduringtherampalsoallowsinstantaneous
adjustmentofthestarteroutputtoallowforchangesin
loadconditions.
The‘SMART‐TORQ®’controlsystemprovidessmooth
starting&stopping,allowingrampprofilingtoproducea
linearaccelerationanddecelerationofthemotorspeed.
Therearemanybenefitswithvariabletorqueloads(such
aspumpsandfans)byachievingalinearrampprofileand
greatercontroloverdeceleration.Withpump
applicationsthisprovidesbettercontroltominimize
waterhammerproblems.
SMART‐TORQBenefitsinclude:
1. Atruelinearaccelerationoftheloadandmotor
forallloadtypes.
2. Reducedpeakinrushstartingcurrents.
3. Reducedstressesandwearonthemechanicsof
thesystem
4. Rampprofilingtobettermatchtypeofloadsuch
asvariabletorqueloads.Bettercontrolof
pumpsandfans,withoutrapidinitialrampbut
linearramp.
5. Reducedheatinginmotoratlowspeeds.
6. Noinstabilityduetochangingpowerfactor.
Closedloopsystemtomonitorandreactto
changingpowerfactor.
7. Noinstabilityduetoslotripplein3wireand6
wireoperation.
8. Bettercontrolofdecelerationthroughclosed
looptorquecontrolsystem.
TheSmartstart®6000offersuseraccesstorampprofiling
parameterstofinetunetheTorqueControlSystemto
achievemoreapplicationspecificperformance
requirements.SeePage44formoreinformation.