Siemens RAJA+ 3TE7421 User Manual

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Installation:
• Openthedoorbyrotatingthedoorlocksanticlockwise.
• Mountthestarteronaverticalwall/platefreefrom
vibrationswithpropernutsandbolts.ReferFig.10for
mountingdimensions.
• Removetherubbergrommetsfortheincomingand
outgoingcableconnections.(ReferFig.2).
• Connectincomingandoutgoingcablesasfollows
(ReferFig.2):
- Usepropercableglandstoensuredustproong.For
conduitentryusepackedwashers.
- SelectcorrectsizeofcablesfromTable1.
- Connectlineandmotorcablesexactlyasperwiring
diagrampastedinsidethecoverofthestarter.
- Terminatetheincomingsupplycablesonterminal
blockTB1&outgoingcablestomotoronterminal
blockTB2,TB3(Tighteningtorque-Refertable2).
- ThisisNotapplicableforFASD3,sinceallconnections
areterminatedonincoming&outgoinglinks.
NOTE:LMRAissetinManualmode(Factorysetting)
- Connecttheearthingconductortoterminalsmarked
(earth)onthestarterbodywithtorque1.2to1.6Nm.
 TheStarterisnowreadyforcommissioning.
• Initiallysettheoverloadrelayto0.58timestherated
motorcurrent.
• Setthetimerdialtothenearestvalueofstartingtime
availableonmotornameplate.Ifitisnotavailable,then
setthedialtoapproximately6-8secs.
• Closethedoorbyrotatingthedoorlocksclockwise.
Commissioning :
Forexactsettingoftimerandoverloadrelay,followthe
instructiongivenbelow:
Before switching ON recheck all external connections.
• Star-DeltaTimersettingforFASD:
- FirstSwitchONtheRockerswitch(ControlOn/Off).
- Startthemotorbypressingthe‘ON’buttonshownin
Fig.1.
- Measurethetimetakenbythemotortonearly
reachratedspeedorsteadystatecurrentcondition
(indicatedwhenthemotorreachesasteadyhum).
- StopthemotorbyOFFbuttonshowning1.
- Openthedoor&Setthetimertothismeasuredvalue
byrotatingthedialshowninFig.3.
• Overloadrelaysetting:
- Forcloserprotectionsettheoverloadrelaytoactual
phasecurrentasmeasuredbyanammeter.Inthe
absenceofanammeter,usetheproceduregiven
below:
- Startthemotorandletitrunfor30mins.Then
graduallyreducetherelaysettingstillittrips.Setthe
relayataslightlyhighervaluethanthissetting.
 Overloadrelaycharacteristics(Referservicemanual
A5E50797230A)canbeusedtoestimatetheaverage
trippingtimeatdifferentmultiplesofsetcurrent.
- Allowaresettimeofapprox.4min.beforepressing
theblueknobontherelaytoresetit.
- Restartthemotoraftersometime.Iftherelaydoes
nottripthenconsiderittobeproperlyset.Ifthe
relaytrips,setatalittlehighervaluethanbeforeand
recheck.
• Closethefrontdoor.
Caution
• During commissioning or maintenance always ensure
that the main supply is disconnected by switching off
the main switch & Rocker switch.
• In the case of FASD starters under no circumstances
should the relay be set higher than the phase
current i.e. 0.58 times the rated current on the motor
nameplate.
• Iftherelaytripsevenwhensetatratedmotorcurrentthe
suitabilityofthestarter/relayfortheparticularapplication
shouldbecheckedwiththenearestSiemensofce.
Operation:
• Ensurethedoorislocked.
• RotatetheMechanicalLatchawayfromOFFpushbutton.
• SwitchOntherockerswitch.
• CheckthestatusofamberLED.WaittillamberLEDis
continuouslyONthenonlyproceed.
• DependinguponSelectorswitchknobpositionforphase
selection,Indicationofincomingpowersupplyvoltage
canbeseenonDualVAmeter.
• Forstartingthemotor,pressGreenpushbuttonmarked
‘I’(Fig.1).
• LinecurrentofRphaseisindicatedbyDualVAmeter.
• MotorisONwhengreenLEDisON.
• ForstoppingthemotorpressRedpushbuttonmarked‘O’
(Fig.1).
• ForLMRAAuto/Bypassmodesrefertroubleshooting
guideA5E50797230A.
ResetOperation
– Iftheoverloadrelaytrips,Resetmanually.(Allowa
resettimeofapprox.4min.)
Fig. 3: Timer Adjustment
Dial

Siemens RAJA+ 3TE7421 Specifications

General

Brand	Siemens
Model	RAJA+ 3TE7421
Category	Industrial Electrical
Language	English