Siemens SMART 7KT User manual

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SMART 7KT0308 Manual
MANUAL
SMART KT
Multifunction meter
7KT0308 (Multi Line LED Class 1)
SMART 7KT power monitoring devices

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SMART 7KT0308 Manual
1. Introduction 3
2. Safety precautions 4
3. Technicalspecication 5
4. Installation 7
5. Connection 9
6. Conguration 11
7. Communication 15
8. Maintenance 20
SMART 7KT
Multifunction meter
7KT0308 (Multi Line LED Class 1)
Manual
Index
09/2022
SME7KT030800

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SMART 7KT0308 Manual
Introduction 
1.1 Purpose of this document
This present manual describes the SMART 7KT multifunction meter.
It is intended for the use of:
• Planners
• Plantoperators
• Commissioningengineers
• Serviceandmaintenancepersonnel
1.2 Required basic knowledge
Ageneralknowledgeoftheeldofelectricalengineeringisrequiredtounderstandthismanual.
Knowledgeoftherelevantsafetyregulationsandstandardsisrequiredforinstallingandconnectingthedevice.
1.3 Components of the product
The carton for the products contain
1 SMART 7KT meter
1setofclamps(4clamps)formountingthemeteronthepaneldoor
1Gasket
1Operatinginstruction
Unit 1x nos. Gasket1xnos. SlidingClamp4xnos.

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SMART 7KT0308 Manual
Safety
precautions 
DANGER
Hazardous voltage will cause death or serious injury.Turnoffandlockoutall
powersupplybeforeworkingonthisdevice.
NOTICE
Installationandmaintenancemustbecarriedoutbyqualied
personnel.
ThisproducthasbeendesignedforenvironmentA.Use
ofthisproductinenvironmentBmaycauseunwanted
electromagneticdisturbancesinwhichcasetheusermay
requiretotakeadequatemitigationmeasures.
Risk of damage: Please ensure the proper isolation of meter
during the IR (Meggering) test.
Allsafetyrelatedcodications,symbolsandinstructionsthatappearinthisoperatingmanualorontheequipment
mustbestrictlyfollowedtoensurethesafetyoftheoperatingpersonnelaswellastheinstrument.Iftheequipmentis
notusedinamannerspeciedbythemanufactureritmightimpairtheprotectionprovidedbytheequipment.
Donotusetheequipmentifthereisanymechanicaldamage.
Ensurethattheequipmentissuppliedwithcorrectvoltage.
NOTICE:
ThisproducthasbeendesignedforenvironmentA.UseofthisproductinenvironmentBmaycauseunwanted
electromagneticdisturbancesinwhichcasetheusermayrequiretotakeadequatemitigationmeasures.
Riskofdamage:PleaseensuretheproperisolationofmeterduringtheIR(Meggering)test.
CAUTION:
1. Read complete instructions prior to installation and operation of the unit.
2. Riskofelectricshock.
3. Theequipmentinitsinstalledstatemustnotcomeincloseproximitytoanyheatingsources,oils,steam,
causticvaporsorotherunwantedprocessbyproducts.

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SMART 7KT0308 Manual
Technical
specification 
7KT0308 (Multi Line LED Class 1)
PowerMonitoringDevicePanelinstrumentforstdelectrical
valuesProtocol:ModbusRTU,MultilineLEDDisplayVaux:95V
to240VACx/1or5A,Class1
Measurements
measuringprocedure
•forvoltagemeasurement True RMS
•forcurrentmeasurement True RMS
typeofmeasuredvaluedetection complete
voltagecurve Sinusoidal or distorted
measurablelinefrequency
•initialvalue 45Hz
•full-scalevalue 65Hz
operatingmodeformeasuredvaluedetectionautomaticlinefrequency
detection
Yes
Supply voltage
designofthepowersupply SMPSpowersupply
typeofvoltageofthesupplyvoltage AC
Degree of protection class
protectionclassIPonthefront IP54
protectionclassIPoftheterminal IP20
Suitability
suitability for operation Installation in stationary panels in closed rooms
Product Functions
product function
•voltagemeasurement Yes
•currentmeasurement Yes
•activepowermeasurement Yes
•reactivepowermeasurement Yes
•apparentpowermeasurement Yes
•powerfactormeasurement Yes
•frequencymeasurement Yes
•apparentenergy/activeenergy/reactiveenergy Yes
•%TotalHarmonicsDistortion(THD) Yes
•Powerdemandmeasurement Yes
Display and operation
designofthedisplay LED
heightofthedisplay 48 mm
widthofthedisplay 62 mm
colorofthebackgroundofthedisplay Black
nationallanguageonthedisplayscreenissupported EN
numberofkeys 4
Fault limits
referenceconditionformeteringaccuracy InaccordancewithIEC61557-12,IEC62053-21,IEC62053-23
formulaforrelativetotalmeasurementinaccuracy
•formeasuredvariablevoltage Class0.5asperIEC61557-12
•formeasuredvariablecurrent Class0.5asperIEC61557-12
•formeasuredvariableapparentpower Class1asperIEC61557-12
•formeasuredvariableactivepower Class1asperIEC61557-12
•formeasuredvariablereactivepower Class2asperIEC61557-12
•formeasuredvariablepowerfactor Class1asperIEC61557-12
•formeasuredvariableactiveenergy Class1asperIEC61557-12andIEC62053-21
•formeasuredvariablereactiveenergy Class2asperIEC61557-12andIEC62053-23

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SMART 7KT0308 Manual
IEC Standards
Description Standard
Accuracy IEC61557-12;
IEC62053-21|ActiveEnergy
EMCrequirements IEC61326-1
Degreeofprotectiontest(IP) IEC60529
Safetyrequirements IEC61010-1and
IEC61010-2-030
7KT0308 (Multi Line LED Class 1)
Inputs Outputs
numberofdigitalinputs 1
typeofelectricalconnectionatthedigitalinputs screw-typeterminals
operatingconditionsfordigitalinputsexternalvoltagesupply Yes
inputvoltageatdigitalinputatDCmaximum 30V
inputcurrentatdigitalinputinitialvalueforsignal<1>-recognition 10 mA
Measuring inputs
measurablesupplyvoltagebetweenLandNatACmaximumratedvalue 240V
measurablesupplyvoltagebetweenLandNatAC
•minimum 11V
•maximum 300V
measurablesupplyvoltagebetweenthelineconductorsatACmaximum
ratedvalue
415V
measurablesupplyvoltagebetweenthelineconductorsatAC
•minimum 19V
•maximum 519V
voltagemeasuringrangeextensionwithexternalvoltagetransformers upto500kV
lineconductorsandneutralconductorsinternalresistanceforvoltage
measurement
1.12MΩ
measuringcategoryforvoltagemeasurement CAT III
measurable current 1A/5A
relativemeasurablecurrentatAC
•minimum 1%
•maximum 120%
currentmeasuringrangeextensionwithexternalcurrenttransformers upto10kA
measuringcategoryforcurrentmeasurement CAT III
Connections
type of electrical connection
•atthemeasurementinputsforvoltage screw-typeterminals
•atthemeasurementinputsforcurrent screw-typeterminals
Mechanical Design
mounting ushpanel-doormounted
sizeofPowerMonitoringDevice size96
height 99mm
width 99mm
cutout dimension 91.5x91.5mm
depth 52mm
installation depth 49mm
netweight 247g
mountingposition Vertical
Environmental conditions
ambienttemperatureduringoperation
•minimum -10°C
•maximum 55°C
ambienttemperatureduringstorage
•minimum -20°C
•maximum 75°C
relativehumidityat25°Cwithoutcondensationduringoperation
maximum
85%
installationaltitudeatheightabovesealevelmaximum 2 000 m
degreeofpollution 2
Certications
SMART 7KT multifunction meter conforms to IEC
standards,IPCelectronicsassemblystandardand RoHS

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SMART 7KT0308 Manual
Assembly 
Installation
For installing the meter
Preparethepanelcutoutwithproperdimensionsasshownbelow.
OUTLINE
Dimensions (in mm)
PANEL CUTOUT
Dimensions (in mm)

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SMART 7KT0308 Manual
Installation Guidelines
1. Thisequipment,beingbuilt-in-type,normallybecomesapartofmaincontrolpanelandinsuchcasetheterminals
donotremainaccessibletotheenduserafterinstallationandinternalwiring.
2. Conductorsmustnotcomeincontactwiththeinternalcircuitryoftheequipmentorelseitmayleadtoasafety
hazardthatmayinturnendangerlifeorcauseelectricalshocktotheoperator.
3. Circuitbreakerormainsswitchmustbeinstalledbetweenpowersourceandsupplyterminalstofacilitate
power‘ON’or‘OFF’function.Howeverthisswitchorbreakermustbeinstalledinaconvenientpositionnormally
accessible to the operator.
4. Beforedisconnectingthesecondaryoftheexternalcurrenttransformerfromtheequipment,makesurethatthe
currenttransformerisshortcircuitedtoavoidriskofelectricalshockandinjury.
5. Theequipmentshallnotbeinstalledinenvironmentalconditionsotherthanthosementionedinthismanual.
6. Theequipmentdoesnothaveabuilt-in-typefuse.Installationofexternalfuseof0.5A,ClassgGtypeforelectrical
circuitryishighlyrecommended.
7. Removethescratch-guardfromthemeterdisplayduringcommissioningofthepanel.
Wiring Guidelines
1. Topreventtheriskofelectricshock,powersupplytotheequipmentmustbekeptOFFwhiledoingthewiring
arrangement.
2. Wiringshallbedonestrictlyaccordingtotheterminallayout.Conrmthatallconnectionsarecorrect.
3. Useluggedterminals.
4. Toreduceelectromagneticinterferenceuseofwireswithadequateratingsandtwistsofthesameinequalsize
shallbemadewithshortestconnections.
5. LayoutofconnectingcablesshallbeawayfromanyinternalEMIsource.
6. Cableusedforconnectiontopowersource,musthaveacross-sectionof1mm2to2.5mm2.Thesewiresshallhave
currentcarryingcapacityof6A.
7. Coppercableshouldbeused(StrandedorSinglecorecable).
For demounting the meter

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SMART 7KT0308 Manual
Connection 
3 Phase - 4 Wire
3Ø-4Wire,3CT’sand3PT’s
2 Phase - 3 Wire
2Ø-3Wire,2CT’sand2PT’s
3 Phase - 4 Wire (commonly used)
3Ø-4Wire,3CT’S
3 Phase - 3 Wire
3Ø-3Wire,2CT’sand2PT’s
Typical Wiring Diagram

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SMART 7KT0308 Manual
Terminal Connections
1 Phase - 2 Wire
1Ø-2Wire,1CT
Typical Wiring Diagram (Continued)