207.07.23 en / 755A
ThedeviceissuppliedwithDCauxiliaryvoltageviaterminalsA1(+)/A2.
Switchingontheauxiliaryvoltage(Power-On)is followedbyaninternal
self-testfor12sec(see„Devicetestfunctions“).Thetestprocessisvisible
inthedisplay.Afterthis,measurementoftheinsulationresistanceinthe
measuring circuits begins and the the colour of the backlight changes
intogreen.
Measuring circuit
(Insulation measurement between terminals L(+) / L(-) and PE1/PE2)
TheinsulationmonitorRN5897/010canbeoperatedeitherwithorwithout
couplingdevice.Max.mainsvoltageandconnectiondiagramshaveto
beobserved!
Iftheinsulationmonitorisoperatedwithoutcouplingdevicetheterminals
L(+)andL(-)havetobeconnecteddirectlytothevoltagesystemtobe
monitored.andtheterminalsVSG1/L(+)andVSG2/L(-)eachhavetobe
bridged(seealsooperationwithcouplingdevice).
Abrokenwiredetectionthatcanbedisabledprovidesafaultsignalifboth
terminalsL(+)andL(-)arenotlinkedbytheconnectednetwork.
Thetypeofnetwork(AC,DC,3NAC)hastobeselected.
AlsotheterminalsPE1andPE2havetobeconnectedwith2separate
wirestotheprotectiveearth.Aninterruptionofawirealsocausesafault
signal(seesection”Behavioronfaultyconnection”).Themonitoringof
thePEconnectioncannotbede-activated.
Tomeasuretheinsulationresistanceanactivemeasuringvoltagewith
changing polarity is connected between L(+)/L(-) and PE1/PE2.The
momentarypolarityofthemeasuringcycleisshownonthedisplayby
2 c u r s e r s e g m e n t s ( „ M P +“ f o rp o s i t i v e p h a s e a n d„ M P - “ f o rn e g a t i v e p h a s e ) .
Thedurationofthepositiveandnegativemeasuringphasedependson
t he se t t in go ft h em a x .l ea ka ge ca pa c it y( „ CE[µF]“inprogrammingmode),
theactualleakagecapacityofthemonitoredsystemandinDCsystems
alsoonthelevelanddurationofpossiblevoltagevariations.Thisallows
acorrectandfastmeasurementindifferentnetworkconditions.
Attheendofameasuringcycletheactualinsulationresistanceisproduced
a n d i n d i c a t e d . T h e a c t u a l v a l u e i s s h o w n o n t h e d i s p l a y. T h e r e l a y s f o r a l a r m
K1andpre-alarmK2switchwhendroppingundertheadjustedresponse
values.Inadditionthebacklightofthedisplaychangestoorangecolor
onpre-alarmortoredcoloronalarm.Anasymmetricearthfaulteitherto
„+“or„-“isalsoindicatedonthedisplay(onlyinDC-systems,orwitha
faultontheDC-sideofasystem).
Manual reset of fault message
Usingthedisplaymenuinprogrammingmode,themanualresetfunction
forinsulationfailures canbe selected. If manual resetisactivatedthe
insulationfaultsignalsofthemeasuringcircuitarestoredwhendropping
undertheadjustedresponsevaluesalsoiftheinsulationresistancegoes
backtohealthystate.Theminimumvalueisstoredandcanbeshownon
thedisplay.Pressingthe„Reset“button(2s)onthefrontside,thealarm
signal and the stored minimum value are reset if the actual insulation
resistanceisinhealthystate.
Indicator relay for insulation fault signal
FortheindicatorrelaysK1(contacts11-12-14,foralarm)andK2(contacts
21-22-24,forpre-alarm)thefunctioncanbesetinprogrammingmodeto
energizedontriporde-energizedontripwhentheinsulationresistance
dropsbelowtheadjustedresponsevalue.
T h e s t a tu s o f t h e i n d i c a t o rr e l a y s i s s h ow n o n t h ed i s p l ay w i t h t h et w o c u r s o r
segments"K1"and"K2".Whentherelayisenergized,thecorresponding
curserlightsup.
Trigger output for insulation fault locating system
Thereisanadditionaltriggeroutputforaninsulationfaultdetectionsystem
ontheinsulationmonitorRN5897/010.
Thistriggeroutput(Y1-Y2)can becoupled withthetriggerinputY1-Y2
of RR 5886 to initiate automatic fault location with the insulation fault
locatingsystem,consistingofRR5886andRR5887.Thetriggeroutputis
activatedwhenthemeasuringvaluedropsunderthealarmresponsevalue
(RE<RA).Aslongasitstaysundertheresponsevalueoranalarmis
stored,thetriggeroutputY1-Y2remainsactive.
Broken wire detection
Asdescribedinsection"Measuringcircut",themeasuringcircuitsL(+)/L(-)
andtheprotectiveconductorsPE1/PE2areconstantlymonitoredforwire
breaks–notonlyatPower-Onoramanualoroccasionalautomatictest.
The response time of monitoring is only a few seconds. Broken wire
detection between L(+) and L(-) is performed via coupled alternating
voltage. This alternating voltage is short-circuited if the terminals are
connectedtotheconnectedmainsatlow-resistance.Thedevicedetects
thatthemainstobemonitoredisproperlyconnected.
S i n c e t h i s b r o k e n w i r e d e t e c t i o n i s c a r r i e d o u t w i t h a l t e r n a t i n g v o l t a g e , l a r g e
c a p a c i t a n c e s s h o u l d b e a v o i d e d b e t w e e n L( +) a n d L ( - ) , s i n c e t h e c a p a c i t i v e
reactanceofthesecapacitancesalsoshort-circuitsthisalternatingvoltage.
ThedevicewouldnolongerdetectaconnectionfaultonL(+)/L(-).
Especiallyparallellinesshouldbepreventedoverlargerdistances.
I fl a r g er c a pa c i t a nc e s b et w e e nL (+ ) / L ( - ) c an n o tb e av o i d e do ri f t he c o u pl e d
alternatingvoltageinterfereswiththesystem,thebrokenwiredetectioncan
bede-activatedusingthedisplaymenuinprogrammingmode.Monitoring
deactivated,monitoringonlyduringdevicetestorcontinuousmonitoring
(every2minutesfor10sec)arethepossibleoptions.Ifthebrokenwire
detectiononL(+)/L(-)isde-activatednoACvoltageisinjected.
ThebrokenwiredetectiononPE1/PE2cannotbede-activated.
Device test functions
Principally,2differenttestfunctionsareimplemented:The"self-test"and
the"expandedtest":
Theself-testofthedeviceisperfor medautomaticallyaf terPower-Onand
eve r yf ullo per at in gh ou rs.I tc an al so be tr ig ger ed man ua ll yata nyt im eb y
pressingthe"Test"buttonatthedevicefrontfor2sec.
W it ht hes el f-t es t,c on tr ar y tot he ex pa nd edt es t,t hes ta tu so ft h eI nd ic ato r
relaysisnotaffected;thesequenceisasfollows:
Thedisplaybacklightcolourchangesintoorange.Forapprox.2sallp ixels
andsegmentsoftheLCDareshown.Afterthatthetext“Test1”comesup
andthemeasuringpulseisswitchedforapprox.5stonegativetestphase.
Thepolarityofthetestvoltageisalsoindicatedonthedisplaybycurser
segments.Withinthese5stheinternalmeasuringcircuitischeckedfor
failures.Thenthemeasuringpulseisswitchedforapprox.5stopositive
testphaseandmoreinternalteststakeplace.Ifnofailuresturnedupand
hadbeenrecognized,themeasurementcontinuous.Theextendedtest
procedureisstartedwhenduringorattheendoftheabovedescribed
12sself-testthetestbuttonispressedagainfor2s.
Thesequenceissimilartotheself-test(2measuringphasesof5seach)
butinadditiontheoutputrelaysgoinalarmstated.Thedisplayshows
“ Te s t 2 ”. T h e ex t e n d e d t e s t c a n b e n i s h e d a f t e r t h e r s t c o m p l e t e s e q u e n c e
(approx.10sec)bypressingthe"reset"buttonfor2seconds.Thedevice
startstheinsulationmonitoringagain.
Test signal
1)
Reset signal
2)
Relay state K1 and K2
Measuring voltage
Positive
Alarm
No Alarm
Insulation
measurement
Insulation
measurement
Insulation
measurement
3)
4)
Self test (Test 1)
Duration: approx. 12s
Self test (Test 1)
Duration: approx. 12s
Duration: approx. 10s
Continuous extended
test (Test 2)
Negative
M12462
U
t
1)Testsignal:ButtonTest>2sorX1/X2<3s
2)Resetsignal:ButtonReset>2sorX1/X2>3s
3)Toinitiatetheextendedtest(Test2)thetestsignalmustbeoperated
withintheselftest(Test1)again.
4)Theresetsignalhasherenofunction,astherstcompletesequence
ofextendedtest(Test2)isnotnished.
FunctionFunction
