ground fault/leakage detector 2620 - aemc · 10 ground fault/leakage detector model 2620 chapter 4...

GROUND FAULT/LEAKAGE DETECTOR 2620

with the Artifical Neutral AN-1

CHAUVIN ARNOUX GROUP

®

E N G L I S H User Manual

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards.

We guarantee that at the time of shipping your instrument has met its published specifications.

An NIST traceable certificate may be requested at the time of purchase, or obtained by returning the instrument to our repair and calibration facility, for a nominal charge.

The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer. For recalibration, please use our calibration services. Refer to our repair and calibration section at www.aemc.com.

Serial #: ________________________________

Catalog #: 2125.52

Model #: 2620

Please fill in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due: _______________________

Chauvin Arnoux®, Inc.d.b.a AEMC® Instrumentswww.aemc.com

Table of Contents

1. INTRODUCTION ............................................................................... 31.1 International Electrical Symbols ................................................31.2 DefinitionofMeasurementCategories .....................................41.3 ReceivingYourShipment ..........................................................41.4 OrderingInformation .................................................................4

1.4.1 AccessoriesandReplacementParts ............................4

2. PRODUCT FEATURES ...................................................................... 52.1 Description ................................................................................52.2 Connections ..............................................................................6

3. SPECIFICATIONS............................................................................. 73.1 ReferenceConditions ...............................................................73.2 Electrical ...................................................................................73.3 Mechanical ................................................................................83.4 Environmental ...........................................................................93.5 Safety ........................................................................................9

4. OPERATION .................................................................................. 104.1 PrincipleofOperation .............................................................10

4.1.1 MeasuringCurrentLeakage .......................................104.1.2 InterpretingtheMeasurement .....................................10

4.2 EquipmentTroubleshooting ....................................................114.3 TestingVariousCableConfigurations .....................................12

4.3.1 MetalConduits ............................................................124.3.2 GroundedNeutral .......................................................144.3.3 NeutralGroundedThroughanImpedance .................154.3.4 UngroundedSystem ...................................................15

4.4 CommonlyAskedQuestions ...................................................15

5. ARTIFICIAL NEUTRAL .................................................................... 17Warning ...........................................................................................175.1 Description ..............................................................................17

5.2 Specifications ..........................................................................195.2.1 Electrical .....................................................................195.2.2 Mechanical ..................................................................195.2.3 Safety ..........................................................................19

5.3 PrincipleofOperation .............................................................205.4 TestingUngroundedSystems .................................................21

6. MAINTENANCE ............................................................................. 226.1 Cleaning ..................................................................................22

RepairandCalibration ...........................................................................23

TechnicalandSalesAssistance ............................................................23

Limited Warranty ...................................................................................24

WarrantyRepairs ...................................................................................24

GroundFault/LeakageDetectorModel2620 3

CHAPTER 1

INTRODUCTION

Warning Thesesafetywarningsareprovidedtoensurethesafetyofperson-nelandproperoperationoftheinstrument.

•Neverusethisclamponconductorswithavoltagepotentialabove600Vrms.

•Neverclamparoundaconductorunlesstheclampisterminatedtoameasuringinstrumentwithproperinputimpedance.

•Keep the jawmatingsurfacesclean. Ifnecessary,useaslightlyoiledclothtoremoveoxidation.

•Ensurethatthecablesorbusbarareproperlycenteredwithintheclampjaws.

•Stayawayfromotherconductorswhichmaycreateinterference.

•Avoidleavingtheclampindampplacesorexposingittorunningwater.

•Duetoshockorfirehazards,electricalconnectionsoftheinstrumentshouldbeperformedonlybyqualifiedpersonnelandinaccordancewithlocal,state,andfederalelectricalrequirements.

1.1 International Electrical Symbols

Thissymbolsignifiesthattheinstrumentisprotectedbydoubleorreinforced insulation.Useonlyspecified replacementpartswhenservicingtheinstrument.

This symbol on the instrument indicates a WARNING and thattheoperatormustrefertotheusermanualforinstructionsbeforeoperating the instrument. In this manual, the symbol precedinginstructionsindicatesthatiftheinstructionsarenotfollowed,bodilyinjury,installation/sampleandproductdamagemayresult.

Riskof electric shock.The voltageat thepartsmarkedwith thissymbolmaybedangerous.

4 GroundFault/LeakageDetectorModel2620

1.2 Definition of Measurement CategoriesCAT II: Formeasurements performed on circuits directly connected to

theelectricaldistributionsystem.Examplesaremeasurementsonhouseholdappliancesorportabletools.

CAT III: For measurements performed in the building installation atthe distribution level such as on hardwired equipment in fixedinstallationandcircuitbreakers.

CAT IV: For measurements performed at the primary electrical supply(<1000V) such as on primary overcurrent protection devices,ripplecontrolunits,ormeters.

1.3 Receiving Your ShipmentUponreceivingyourshipment,makesurethatthecontentsareconsistentwiththepackinglist.Notifyyourdistributorofanymissingitems.Iftheequip-mentappearstobedamaged,fileaclaimimmediatelywiththecarrierandnotifyyourdistributoratonce,givingadetaileddescriptionofanydamage.Savethedamagedpackingcontainertosubstantiateyourclaim.

1.4 Ordering InformationGround Fault/Leakage Detector Model 2620...................Cat. #2125.52Includes user manual and warranty card.

1.4.1 Accessories and Replacement PartsAdapter–4mmNon-insulatedforSafetyLeads................. Cat. #1017.45(Converts male safety plugs to non-shielded male plugs)

ArtificialNeutralModelAN-1................................................ Cat. #1971.01Includes instrument with soft carrying case; eight 1.5 V “AA” batteries; four 5 ft (1.5 m) color -coded leads (green, red, black, blue) and user manual.

Bag–LargeClassicToolBag .............................................Cat. #2133.71

Bag–SmallClassicToolBag .............................................Cat. #2133.72Lead–Replacement ...........................................................Cat. #2950.29Set of 4 Color-coded 5 ft Safety Leads (4mm straight banana plugs on both ends) for use with the Artificial Neutral Model AN-1. Rated 600V CAT IV


CHAPTER 2

PRODUCT FEATURES

2.1 DescriptionTheModel2620measuresleakagecurrentshuntedtogroundcausedbyinsulationbreakdownor leaks. Itenables theoperator to locate failureswhenorbeforetheyoccur,withoutshuttingdownequipmentorspendinghourstrouble-shooting.It isdesignedspecifically for locating lowcurrent faultsonhighcurrentloads.ThedetectorisasensitiveACcurrenttransformercapableofmea-suring differential or leakage current from500µA, andmay be used tomeasurecurrentupto400Acontinuousduty.TheModel2620provides,ontworanges,1mV/mAACor1mV/AAC.Theoutputleadsareterminatedwithstandard4mmbananaplugscapableofinterfacingwithanystandardmultimeter.Useofadigitalmultimeterwithanalogbargraphisrecommended:Digitaltoprovidethepropervoltageinputimpedance,andananalogbargraphtotracktrends.Whenthe2620isusedasacurrentleakagedetector,itmakesnodifferenceifthesystemissingle-phaseorpoly-phase,orifthecurrentsarein-phaseoroutofphase,balancedorunbalanced.Thenetmagneticfieldatanyinstantintimewillbezeroifalltheconductorssurroundedbythecurrentleakagedetectoraresupplyingallthecurrentdeliveredtoandreceivedfromtheload.Ifanycurrent isdiverted throughanyalternatepath toground,suchasaninsulationbreakdown,thenetlosswillbedetectedproducingaoutputproportionaltotheamplitudeofthefaultcurrent.TheModel2620mayalsobeusedsimplyasahighlyaccurateclamp-oncurrentprobe.Withits4"jawopeningandrangeof500µAto400A,the2620providesaversatileway toanalyzeunbalancedcurrentmeasurements,leakagevaluesongroundingconductorsandgroundloopcurrents.


2.2 ConnectionsThe Model 2620 is compatible with most DMMs, voltmeters, or othervoltagemeasuringinstrumentswiththefollowingfeatures:

• Rangeandresolutioncapableofdisplaying1mVACofinput.• Voltmeteraccuracyof0.75%orbettertotakefulladvantageofthe

accuracyoftheprobe.• Minimuminputimpedanceof1MΩ.

Connecttheprobetothemultimeterorotherinstrument.

SelecttheappropriateACvoltagerangeonyourmultimeter.

TheModel2620hastwoselectableoutputranges.The4Arangewillpro-duceamV/mAwithanoutputof4VACat4A.The400Arangeproduces1mV/Awith400mVAC at 400A.

Warning: User SafetyAlwaysuseaDMM, voltmeter or other displayingdevice, appropriatelyratedfortheworkingvoltageandforsafety.


CHAPTER 3

SPECIFICATIONS

3.1 Reference Conditions

Ambient temperature: 23°C ± 3KRelative humidity: 20to75%RHPosition of the conductor: CenteredinthejawsCurrent frequency and form: Sinusoidal50/60Hz±0.2Hz,distortion<1%Superimposed DC current: NoDCcurrentContinuous magnetic field: Earthfield<40A/mAlternating magnetic field: NoexternalalternatingmagneticfieldProximity of external conductors: NoneMeasuring device’s impedance: ≥10MΩ/100pF

3.2 Electrical

4A Range

Nominal Current: 4AAC

Measurement Range: 0.5mA to 4AAC

Output Signal: 1mVAC/mAAC

4A Range 0.5 to 10mA 10 to 100mA 100mA to 4AAccuracy 3%ofR±1mV 0.5%ofR±0.5mV 0.5%ofR±0.5mVPhaseShift – < 15° < 10°

400A Range

Nominal Current: 400AAC

Measurement Range: 0.5A to 400AAC

Output Signal: 1mVAC/AAC

400A Range 0.5 to 10A 10 to 100A 100 to 400AAccuracy 0.5%ofR±0.5mV 0.35%ofR±0.5mV 0.35%ofR±1mVPhaseShift – < 1° < 0.6°


Overloads• Iplimitcurrent:permanent400ACRMS• Peakcurrent:<1000A• Permissibletransientdi/dt:≤30A/μs• Conductortemperature:≤70°Cwithamaximumpeakof90°C

Load Impedance (DMM):1MΩ min

Frequency:48to1000Hz

Errors caused by external influences:Ambient temperature <0.1%per10KPosition of the gripped conductor(maxwithnotcentredconductor)

0.1%typicofVOUT(non-differentialcurrent);0.2%max

Residual differential(maxwithnotcentredconductor)

0.1%typicofIP(differentialcurrent);0.2%max

External fields, 1V/A (1) <60mVofVsExternal fields, 1mV/mA (1) <100μVofVsCoupled DC current, 1V/A (2) <1mVforcontinuous1ACoupled DC current, 1mVm/A (2) <0.1mVforcontinuous1AFrequency, 1V/A (3) <1.5%from30Hzto1KHzFrequency, 1mV/mA (3) <0.5%from30Hzto1KHz

(1): 400 A/m 50Hz field perpendicular to the clamp opening(2): DC current coupled onto an AC current(3): Limited to 1KHz for 100A

3.3 MechanicalDimensions: 11.2x6.9x1.8"(285x175x45mm)

Weight:2.9lbs(1300g)approx

Jaw opening: 4.4"(112mm)

Maximum Jaw Gap:9.8"(250mm)

Maximum Clamping Capacity: Max4.5"(115mm)Øcable


3.4 EnvironmentalOperating Temperature:-14°to131°F(-10°to55°C);0to85%RH(non-condensing)

Storage Temperature:-40°to158°F(-40°to70°C);0to85%RH(non-condensing)

Operating Altitude: ≤2000monuninsulatedconductors

Transport Altitude: ≤12000m

3.5 SafetyElectrical Safety

EN61010,600VCATIIIPollutionDegree:2

Electromagnetc CompatibilityIndustrialEnvironment:CriterionBEmissivity(EN61326-1)Susceptibility(EN61326-1)

Self-extinguishing CapabilityJawsandCasing:VO(UL94)


CHAPTER 4

OPERATION

4.1 Principle of Operation

4.1.1 Measuring Current Leakage

WhenageneratorsuppliesanACloadthroughapairofwiresinaninsulatedcable,thecurrentgoingoutononewireisequaltothecurrentreturning;their vector sumequalszero.Aground fault changes thisequality,andtheleakagecurrentdetectorpicksitup,measuresit,andprovidesanACvoltageoutputproportionaltotheseverityoffaultcausingtheunbalance.Thegroundconductormustnotpassthroughthedetector.

4.1.2 Interpreting the MeasurementFigure1isaschematicofasingle-phaseinstallationofamotorandanoven,bothgrounded.Thenumbersindicatetheamplitudesofthecurrentsin different conductors.This installation has no faults. If you clamp thedetectoraroundthecablesatpointsA,B,CorD,itwilloutputzero.

115V/230V 15A

15A

10A

10AA B

C D

5A 5A 10A 10A

10A5A

GND

MOTOR

ZEROAMPERE

ZEROAMPERE

OVEN

GND

Figure 1


InFigure2,thereisafaultintheinstallation.AtpointA,theModel2620detects 1A (the difference between 16A and 15A), indicating a faultdownstream.AtpointC, itdetectszero; therefore, thefault isnot in theoven.AtpointsBandD,thedetectorpicksup1A,showingthatthefaultisinthemotor.Ifitgetsworse,theleakagecurrentwillincreaseandthecircuitbreakerwill trip.Thismotorshouldbedisconnected immediatelyandrepaired.

115V/230V 15A

15A

10A

11AA B

C D

5A 5A 10A 11A

10A5A

GND

MOTOR

1A

1A

OVEN

GND

1A

RESIDUAL CURRENT: 1A

Figure 2

In a three-phase installation the principle is the same. But here it isnecessarytopassallactiveconductorsthroughthedetector,includingtheneutralifoneisused.Ifthisisdoneproperly,thedetectoroutputwillbezeroifthereisnocurrentleakingtoground.Ifitdetectssomethingotherthanzero,thereisagroundfaultthatshouldberepaired.

4.2 Equipment TroubleshootingTolocateafaultquickly,beginyourtroubleshootingattheincominglow-voltagedistributionheader.Successivelycheckeachfeeder.IftheModel2620 detects a ground fault, follow the feeder downstream, branch bybranch,totheequipmentwiththeproblem.

It isuseful to takemeasurementsperiodically tocreateahistoryof thequalityoftheinsulation.Thisisgoodpreventivemaintenancewhichcouldprovevaluable later. Ifyoudetectafaultcurrentthat isvery lowinitiallybut increasesfromdaytoday,thismeansthatelectrical failure is immi-nentandshouldbetakencareofduring thenextplannedmaintenanceshutdown.


Forbestresults,centertheconductorswithintheclampjaws.Checkthattheedgesofthejawsareperfectlycleanandthattheyclosetightly.Trytoavoidplacingtheconductorsnearthegaps,andgroupthemasmuchaspossible.

Ifyouarecareless,youcanaffectthemagnitudeofthereading,depend-ingon thecurrentbeingcarried in theconductors. Incertaincases thisrequiresan interpretation.Normally,however, theabsolutevalueof thegroundcurrentisnotimportant.Allyouneedtoknowiswhethertheread-ingiszero.

4.3 Testing Various Cable ConfigurationsOlder installationshaveawidevarietyofelectricaldistributionsystems.Cablesareclampedtowallsandpassthroughmetalconduits,andtherearemanycaseswhereashieldedcablewasinstalledduringrevampingofanareaoradditiontoabuilding.Ifacableisclampedtowalls,detachitandpullitawayfromthesurfaceatseveralpoints,sotheclampcansur-roundalltheconductors.

4.3.1 Metal Conduits

Cablesenclosedinmetalconduitswhicharegroundedarenotaproblem.Simplyapplytheclamparoundtheconduit;themetaltubewillnotblockthemeasurement.Cableswithametalshieldcanbehandledinthesamewayascableinmetalconduit.

Agroundedshieldmaypresentaproblem.Ifitisasimplemetalshield,likeathinmetalwrapping,itcanbeconsideredinthesamewayasthemetalconduit. If thearmor isgroundedbyaconductor, itmaybeaninconve-nience,dependingontheterminalconnections,aswellasonthenumberandtypeofgroundconnectionsalongthecable.

InFigure3 thedetectorsensesthefaultbecausetheshield isnotcon-nected to the motor frame and the leakage current cannot flow backthroughthedetector.

InFigure4,however, the instrumentcannot“see” thefaultbecausetheshield is connected to the motor frame, letting the fault current returnthrough thedetector and causing it to read zero. If possible, take yourmeasurementwhereyoucanavoidclosingtheshieldintheclamp,suchasthenearestcontrolpanelorinsidetheconnectingboxofthemotor.


Figure 3 Figure 4

OnewaytocircumventthisshieldedcableproblemisshowninFigures5and6.Heretheshieldisloopedthroughthedetectortwice,sothatthereadingwillbethatofthefaultcurrent.

Figure 5 Figure 6


4.3.2 Grounded NeutralIt is easy to takemeasurements on this type of network, wheremajorfaults trip thecircuitbreaker.Here, thedetectorcansenseminor faults,sorepairscanbemadebefore theproblemgetsworse.The inspectionmethodisthesameasforasingle-phaseinstallation.Rememberthatonathree-phasenetwork,thecurrentsaddaccordingtothevectorsumlaw.TheModel2620measuresthevectorsumoftheenclosedcurrents.Ifyouhave,forexample,a400mAfaultanda250mAfaultonthesamephase,theModel2620willdetect650mA.But if the two faultsareondifferentphases,theyaddvectoriallyandmayevensumuptozero.Figure7showsanexampleinwhichtherearetwoseparatefaults:400mAonamachine inoneshop,250mAonamachine inanothershop.Thevectorsumisnot650mA,but350mA.Ifyouswitchoffthemachinewiththe250mAfault,thereadingincreases,indicatingfaultsondifferentphases.

Shop 2

Shop 1Fault on Phase 1

400mA

Fault on Phase 2250mA

Figure 7


4.3.3 Neutral Grounded Through an ImpedanceFollowtheprocedurethesamewayasforagroundedneutralinstallation,butwithcare.Whentheneutralisgroundedthroughanimpedance,afault(evenaseriousone)maynottripthecircuitbreaker,andthecircuitwillstay live.

4.3.4 Ungrounded SystemIn order to measure on an ungrounded system, the optional ArtificialNeutralModelAN-1mustbeusedinconjunctionwiththeModel2620.For measurement procedures, see the information in this manual inChapter5.

4.4 Commonly Asked Questions

Q. I have found an indication of 40 to 50mA on one of the main feed-ers with 300A on the line. Is this value a fault?

A. With300Aontheline,itispossibletofindanundesiredcurrentofthatmagnitude.Different cables in the installationmay not have equivalentcapacitanceand resistance.Thesecablesprovide forhighcurrentand,ofcourse,weapplyahighcurrent.Therefore,wemayhaveacapacitiveinfluencewhichcorrespondsto45mA.

Q. Must the conductors be centered within the jaws?

A. Youshouldavoidplacingtheconductorscloseagainstthemagneticcircuit near the gaps, and should group the conductors as much aspossible. Best results are obtained while centering the conductor. Youmustalsoensurethatthejawmatingsurfaceareperfectlycleanandthatnothingpreventsthemfromclosingtightly.

Q. Is it possible when checking cables which run parallel, yet supply the same load, to clamp the detector over each cable separately?

A. Whenthereareparallelcables, themeasurement isvalidonly if thedetectorincludesthecablestogether.Infact,ifyoutakeeachonesepa-rately, it ishighlyprobable that thedistributionofcurrent in theparallelcablesisnoteven.Thesedifferencescanbecausedbythefactthatthecablesmaynothaveexactlythesameimpedance.


Q. I have detected faults of 400mA and 250mA on branch circuits being supplied by the feeder. But clamping onto the incoming feeder resulted in an indication of 350mA. Can you explain why 400mA + 250mA = 350mA?

A. Thedetectormeasuresresidualcurrent;inotherwords,thevectorialsumofthecurrents.Ifyouhavea400mAfaultanda250mAfaultonthesamephase,youhaveeverychanceoffinding650mA.But,ifyouhavetwofaultsondifferentphases,theyaddasvectorsactually,inaverytheo-reticalcasewecouldevenfindzero.

Q. The Model 2620 detects faults caused by insulation failures. How does detecting faults with the detector differ from information result-ing from megohmmeter insulation tests?

A. TheModel2620willdetectelectricalfaultswhiletheequipmentisstillinoperation.Thisofferstwodistinctadvantages.First,itisnotnecessarytoshut theequipmentdown,eliminatingcostlydown time;andsecond,you may detect faults that would not be evident under non-energizedconditions.

Q. Would it be possible to clamp the Model 2620 directly around the grounding detector?

A. Yes,insomeinstancesitmaybepossibletodetectfaultcurrentonaspecificmotorifthereisadedicatedgroundingpath.However,ifseveraldevicesaresharingacommonground, itshouldbenotedthat thefaultmaybeoccurringonanyone(ormultiple)ofthedevices.


CHAPTER 5

ARTIFICIAL NEUTRAL

Warning • Themeasurementofleakagecurrentisdonespecificallywithaclamp

designedforthispurpose.• TheArtificialNeutralmustbeconnected toaknown low resistance

ground.• Iffaultfindingexceeds15minutes,removetheArtificialNeutralfrom

itscarryingcase.• TheArtificialNeutralmustalwaysbeintheOFFpositionwhencon-

nectingtheleads.• Always make connections from the instrument to the circuit under

test.• Alwaysinspecttheinstrumentandaccessoryleadsforserviceability

priortouse.Replacedefectivepartsimmediately.• Neverusetheinstrumentonelectricalconductorsratedabove600V.

5.1 DescriptionTheArtificialNeutral isanaccessoryfortheAEMCModel2620GroundFault/LeakageDetector.Itgeneratesagroundedartificialneutraltoallowthemeasurementoffaultcurrentsonungrounded3phasesystems.Inanungroundedsystem,theimpedancebetweenthetransformer,neu-tral,andgroundisinfinity.Therefore,independentoftheloadcurrent,nogroundfaultcurrentshouldflow.TheArtificialNeutralcreatesanintermittentreturn path for the ground fault current enabling the troubleshooter todistinguishitfromloadcurrent.TheArtificialNeutralisgroundedintermittentlythrougharelaydrivenbyaninternalclock.Thisperiodicgroundingtechniqueperformsthreefunc-tions:

• Limitsthepossibilityofinsulationfaultswithinthecase.• Allowsbetterdiscriminationofactualfaultcurrent.• Limitsinstrumentoverheating


Relayclosuretimeisselectedexternally(FastorSlow)sothatthegroundfaultclampcanbeusedoneitherananalogordigitaldisplay.Whenusingondigitalmultimeter,placetheswitchintheslowposition;whenusingananalogmultimeter,settheswitchtothefastposition.An internal buzzer, also driven by the relay, is activated each time theneutralconnection isgrounded.Three lights,oneforeachphase,showthepresenceofeachofthethreephasesintheArtificialNeutralpriortomeasurement.Afourthgreenlightindicatestheinstrumentisoperating.

WARNINGConnect and disconnectonly in the OFF position

ARTIFICIAL NEUTRALMODEL AN-1

ONSlow

OFF

ONFast

SPECIFICATIONSWorking Voltage: 100 to 600VFrequency: 45 to 65HzBatteries: 8 x 1.5V AA (LR6)EN 61010, 600V, Cat. III, Pol. 2

600V max

ON

ON light(green)

Male-male safety leads,4 mm Ø, length 5 ft (1.5 m) double insulation

CarryingStrap

Ventilation holes3 position switch: • ON, Slow test • OFF • ON, Fast test

[Carrying case not shown]

Safety alligator clips

CV3

AV1

BV2

Red light, showingvoltage present and phase fault

Figure 8


5.2 Specifications

5.2.1 Electrical

Working Voltage:30to600V

Frequency: 45to65Hz

Resistance Per Phase: 3.9kΩ±5%

Relay Duty Time:Slowposition:0.5sFastposition:2.3s

Power Source: Eight1.5V“AA”batteries

Power Consumption:180mA(approx)

Average Battery Life:40hours

5.2.2 Mechanical

Reference Temperature: 23°C ± 3°C

Operating Temperature: 32°to122°F(0°to50°C);10to90%RH

Storage Temperature:-40°to158°F(-40°to70°C);10to90%RH

Case: FireresistantpolycarbonateUL94

Color: Yellow

Dimensions: 8.7x5.4x5.9"(220x136x150mm)

Weight: 2.9lbs(1.3kg)

5.2.3 Safety

Dielectric Strength Test: 6kVbetweenterminalandcase

600VCATIII


5.3 Principle of OperationIfthereisnotaninsulationfaultonthesystem,noleakagecurrentwillflowtoground.Thevectorsumofthecurrentsflowingthroughthethreecon-ductorsenclosedwithintheclampiszero.Thedisplaywill indicatezero(seeFigure9).

A B C N

AN1

M

Figure 9

Ifthereisafault,aleakagecurrentthenflowsbetweenthefaultyphaseandground.Thedetectionofthisfaultcurrentonanungroundedsystemwillbeintermittentasdeterminedbytherateofrelayclosure(Figure10).

Figure 10

Duetothefaultcurrent,thevectorialsumsofthecurrentwillnolongerbezero.Faultcurrentwillbe indicatedbytheselectionontheModel2620clampofeither1mVpermAor1mVperAAC.


5.4 Testing Ungrounded SystemsBefore starting, ensure that theArtificial Neutral batteries are in goodcondition.Switchontheinstrument(FastorSlow).Thegreenlightmustbeilluminated,andthebuzzermustbeactivatedattheselectedrate.Ifthegreenlightisout,orifthebuzzersoundsweak,replacethebatteries.Switch the instrument OFF (green light off). Connect the leads to theappropriatephasesofthesystemundertest.Atthispoint,do not connect the Artificial Neutral to ground.

• PhaseA:RED• PhaseB:BLACK• PhaseC:BLUE

Switch the instrumentON (Fast or Slow).The three phase lightsmustcome on at the same time, then periodically, at the same rate as thebuzzer.Ifoneormoredonotlight,stopthetestandverifyconnectionsortheexistenceofaphasefault.Note:Theremustbeatleast30Vbetweenphases.After verifying that all the lights have illuminated properly, turn theinstrumentOFFandconnecttheGROUNDleadtoaknowngoodground.Tomeasurethevalueofthefault,connecttheModel2620toamultimeterwith an appropriate measurement range. Enclose the three phaseconductorswithinthejaws.SwitchONtheArtificialNeutral(FastorSlow)dependingontheresponsetimeofthemeasuringinstrument.Theactualfaultmeasurementmust bemadewhen the instrument relay is closed(e.g.,when thebuzzersounds).Themeasuredvaluewhen the relay isclosedistheactualvalueofthefaultcurrent,dependingontheselectedoutputsignal.To disconnect theArtificial Neutral, reverse the procedure. Switch theArtificial Neutral OFF, disconnect the GROUND lead, then disconnecteachoneofthephaseleads.


CHAPTER 6

MAINTENANCE

WARNING:

• Formaintenanceuseonlyspecifiedfactoryreplacementparts.

• Toavoidelectricalshock,donotattempttoperformanyservicingunlessyouarequalifiedtodoso.

• Toavoidelectricalshockand/ordamagetotheinstrument,donotgetwaterorotherforeignagentsintothecase.TurntheinstrumentOFFanddisconnecttheunitfromallthecircuitsbeforeopeningthecase.

6.1 Cleaning• Wipethecaseandjawcoverswithalightlymoistenedclothand

milddetergent.

• Donotuseanyabrasivesorsolvents.

• Ifrusted,thejawmatingsurfacesoftheModel2620maybelightlysandedwithveryfinesandpaperandthenverylightlyoiled.Wipeoffexcessoilanddonotletitdripintothecase.


Repair and Calibration

Toensurethatyourinstrumentmeetsfactoryspecifications,werecommendthatitbescheduledbacktoourfactoryServiceCenteratone-yearintervalsforrecalibration,orasrequiredbyotherstandardsorinternalprocedures.

For instrument repair and calibration:Youmust contactourServiceCenter foraCustomerServiceAuthorizationNumber(CSA#).Thiswillensurethatwhenyourinstrumentarrives,itwillbetrackedandprocessedpromptly.PleasewritetheCSA#ontheoutsideoftheshipping container. If the instrument is returned for calibration,weneed toknowifyouwantastandardcalibration,oracalibrationtraceabletoN.I.S.T.(Includescalibrationcertificateplusrecordedcalibrationdata).

Ship To: ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments 15 Faraday Drive Dover,NH03820USA Phone:(800)945-2362(Ext.360) (603)749-6434(Ext.360) Fax: (603)742-2346or(603)749-6309 E-mail:[email protected]

(Orcontactyourauthorizeddistributor)Costsforrepair,standardcalibration,andcalibrationtraceabletoN.I.S.T.areavailable.NOTE: You must obtain a CSA# before returning any instrument.

Technical and Sales Assistance

Ifyouareexperiencinganytechnicalproblems,orrequireanyassistancewiththeproperoperationorapplicationofyourinstrument,pleasecall,mail,faxore-mailourtechnicalsupportteam:

ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments 200FoxboroughBoulevard Foxborough,MA02035USA Phone:(800)343-1391 (508)698-2115 Fax: (508)698-2118 E-mail:[email protected] www.aemc.com

NOTE: Do not ship Instruments to our Foxborough, MA address.


Limited Warranty

TheModel2620iswarrantedtotheownerforaperiodoftwoyearsfromthe date of original purchase against defects inmanufacture.This lim-itedwarrantyisgivenbyAEMC®Instruments,notbythedistributorfromwhomitwaspurchased.Thiswarranty isvoid if theunithasbeentam-peredwith,abusedorifthedefectisrelatedtoservicenotperformedbyAEMC® Instruments.

For full and detailed warranty coverage, please read the Warranty Coverage Information, which is attached to the Warranty Registration Card (if enclosed) or is available at www.aemc.com. Please keep the Warranty Coverage Information with your records.

What AEMC® Instruments will do:Ifamalfunctionoccurswithinthewarrantyperiod,youmayreturntheinstrumenttousforrepair,providedwehaveyourwarrantyregistrationinformationonfileoraproofofpurchase.AEMC®Instrumentswill,atitsoption,repairorreplacethefaultymaterial.

REGISTER ONLINE AT:www.aemc.com

Warranty Repairs

What you must do to return an Instrument for Warranty Repair: First, request aCustomerServiceAuthorizationNumber (CSA#) by phoneorbyfaxfromourServiceDepartment(seeaddressbelow),thenreturntheinstrumentalongwith thesignedCSAForm.Pleasewrite theCSA#on theoutsideoftheshippingcontainer.Returntheinstrument,postageorshipmentpre-paidto:

Ship To: ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments 15FaradayDrive•Dover,NH03820USA Phone:(800)945-2362(Ext.360) (603)749-6434(Ext.360) Fax: (603)742-2346or(603)749-6309 E-mail:[email protected]

Caution:Toprotectyourselfagainstin-transitloss,werecommendyouinsureyourreturnedmaterial.

NOTE: You must obtain a CSA# before returning any instrument.

CHAUVIN ARNOUX GROUP

®

05/17

99-MAN100292v8

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments15FaradayDrive•Dover,NH03820USA•Phone:(603)749-6434•Fax:(603)742-2346

www.aemc.com

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