
210.11.23 en / 800A
ThedeviceissuppliedwithDCauxiliaryvoltageviaterminalsA1(+)/A2.
Switchingontheauxiliaryvoltage(Power-On)isfollowedbyaninternal
self-testfor12sec(see„Devicetestfunctions“).Thetestprocessisvisible
inthestatusLED.Afterthis,measurementoftheinsulationresistance
in the measuring circuits begins and the the colour of the status LED
changestogreen.
Measuring circuit
(Insulation measurement between terminals L(+) / L(-) and PE1/PE2)
TheterminalsL(+)andL(-)areconnecteddirectlytothevoltagesystem
tobemonitored.Abrokenwiredetectioncreatesafaultsignalifthereis
nolow-ohmicconnectionbetweenbothterminals.
Thetypeofnetwork(AC,DC,3NAC)hastobeselected.
AlsotheterminalsPE1andPE2havetobeconnectedwith2separate
wirestotheprotectiveearth.Aninterruptionofawirealsocausesafault
signal(seesection”Behavioronfaultyconnection”).Themonitoringof
thePEconnectioncannotbede-activated.
Tomeasuretheinsulationresistanceanactivemeasuringvoltagewith
changingpolarityisconnectedbetweenL(+)/L(-)andPE1/PE2.
Attheendofameasuringcycletheactualinsulationresistanceisproduced
and indicated. Therelaysforalarm K1andpre-alarmK2switchwhen
d r o p p i n g u n d e r t h e a d j u s t e d r e s p o n s e v a l u e s . I n a d d i t i o n t h e L E D c h a n g e s
toorangecoloronpre-alarmortoredcoloronalarm.
Manual reset of fault message
Therotaryswitch"UN"isdevidedin2sections.Soadditionaltothetypeof
voltagesystemalsomanualorautoresetcanbeselected.(Alarmstoring:
manualreset,noalarmstoring:autoreset).
Ifmanualresetisactivatedtheinsulationfaultsignalsofthemeasuring
circuit are stored when dropping under the adjusted response values
alsoiftheinsulationresistancegoesbacktohealthystate.Pressingthe
„Reset“buttononthefrontsidefor2s,thealarmsignalareresetifthe
actualinsulationresistanceisinhealthystate.
Indicator relay for insulation fault signal
FortheindicatorrelaysK1(contacts11-12-14,foralarm)andK2(contacts
21-22-24,forpre-alarm)thefunctionenergizedontriporde-energizedon
tripcanbesetviapre-alarmrotationalswitch"RpA"whentheinsulation
resistancedropsbelowtheadjustedresponsevalue.
Broken wire detection
A s d e s c r i b e d i n s e c t i o n " M e a s u r i n g c i r c u t ", t h e m e a s u r i n g c i r c u i t s L (+ ) / L ( - )
andtheprotectiveconductorsPE1/PE2areconstantlymonitoredforwire
b r e a k s – n o t o n l y a t P o w e r - O n o r a m a n u a l o r o c c a s i o n a l a u t o m a t i c t e s t . T h e
responsetimeofmonitoringisonlyafewseconds.Brokenwiredetection
betweenL(+)andL(-)isperformedviacoupledalternatingvoltage.This
alternatingvoltageisshort-circuitediftheterminalsareconnectedtothe
connectedmainsatlow-resistance.Thedevicedetectsthatthemainsto
bemonitoredisproperlyconnected.
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 do u t w i t h a l te r n a t i n g vo l t a g e , l ar g e
c a p a c i t a n c e s s h o u l d b e av 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(-).
Especiallyparallellinesshouldbeavoidedoverlargerdistances.
I fl ar g erc a pa c i ta n c esb et w e enL (+ ) / L( - )c a nn otb eavo i d e d o ri ft h e c o u p le d
alternatingvoltageinterfereswiththesystem,thebrokenwire detection
canbede-activatedusingalarmrotaryswitch"R
A
".Monitoringdeactivated
or continuous monitoring (every 2 minutes for 10 sec) are the possible
options. If the broken wire detection on L(+)/L(-) is de-activated no AC
voltageisinjected.
ThebrokenwiredetectiononPE1/PE2cannotbede-activated.
Device test functions
Principally,2differenttestfunctionsareimplemented:The"self-test"and
the"expandedtest":
Theself-testofthedeviceisperformedautomaticallyafterPower-Onand
eve r yf ul lo pera tin gh ours. It can al sob etr igger edm anu ally at an yt im eby
pressingthe"Test"buttonatthedevicefrontfor2sec.
W it hth es elf-test ,c o nt rar ytotheex p an d edte st ,t hest at usoft h eI ndi cator
relaysisnotaffected;thesequenceisasfollows:
Theself-testisindicatedviaLEDwithorangeashcode1.Forapprox.
5stonegativetestphase.Withinthese5stheinternalmeasuringcircuit
ischeckedforfailures.Thenthemeasuringpulseisswitchedforapprox.
5stopositivetestphaseandmoreinternalteststakeplace.Ifnofailures
turnedupandhadbeenrecognized,themeasurementcontinuous.The
extendedtestprocedureisstartedwhenduringorattheendoftheabove
describedself-test(12s)thetestbuttonispressedagainfor2s.
Thesequenceissimilartotheself-test(2measuringphasesof5seach)
but in addition the output relays go in alarm stated. The LED shows
orangeashcode2.Thetestphasesoftheextendedtestwillberepeated
continuously.Theextendedtestcanbenishedaftertherstcomplete
sequence(approx.10sec)bypressingthe"reset"buttonfor2seconds.
Thedevicestartstheinsulationmonitoringagain.
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.
Function