User Manual

DIR 1000587R0002 (L3821)
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2.6.2 Troubleshooting
Thefollowingtablelistsaseriesoftypicalserviceconditions,tohelpyouunderstandandsolvehypotheticalfaultsormalfunctions.
N.B.:
1. Before consulting the following table, check for a few seconds for any optical signals provided by the LEDs.
2. FN indicates normal operation of the LSIG unit.
3. When the suggestions proposed do not lead to a solution of the problem, please contact AB assistance service.
No. Situation Possible causes Suggestions
 1 Triptestcannotberun 1.Busbarcurrentis>0. 1.FN
  2.TheTCisnotconnected 2.CheckTCconnection
(seepar.2.3.2)
  3.Batteryunitisdisconnected 3.Connectbatteryunit.
 2 Triptimeslower 1.Thresholdtoolow 1.Correctthreshold
 thanexpected 2.Curvetoolow 2.Correctcurve
  3.Incorrectneutralselection 3.CorrectNeutraladjustment
 3 Triptimeshigher 1.Thresholdtoohigh 1.Correctthreshold
 thanexpected 2.Curvetoohigh 2.Correctcurve
  3.Curvetype“t=k/I
2”
 3.Selectcurvetype“t=k”
  4.Incorrectneutralselection 4.CorrectNeutraladjustment
 4 Rapidtrip,withI3=Off Iinsttripped FNshort-circuitwithhighI
 5 Earthfaultcurrentbeyondthreshold, Gfunctionautomaticallyinhibited FN    
  butnotripoccurs
 6 Noexpectedtrip FunctionOFF FNenableprotectionfunctionif 
   necessary
 7 AbnormalLEDswitch-on  Seepar.2.6.1
 8 Unexpectedtrip  Seepar.2.6.1
 9 LLED(orange)ashing  FN
2.6.3 In case of a fault
If the LSIG is suspected of being faulty, there are signs of malfunctions or it has generated an unexpected trip, we advise you
to strictly follow the recommendations below:
1. Press“iTest”button(within48hoursofopeningtheCB)andmakeanoteofwhichLEDison,alsorecordingtypeofCB,numberofpoles,
anyconnectedaccessories,In,andserialnumber(seepar.2.4).
2. Prepareabriefdescriptionofopening(whendidittakeplace?,howmanytimes?,wasitalwaysunderthesameconditions?whattypeofload?
whatcurrent?istheeventreproducible?)
3. Send/communicateallinformationcollected,togetherwithCBcircuitdiagram,toyournearestABCustomerAssistanceservice.
Deliveringcomprehensive,accurateinformationtoABAssistanceservicewillfacilitatetechnicalanalysisoftheproblemencountered,andallow
ustopromptlycarryoutallactionsusefulfortheuser.
2.7Accessories
2.7.1 Battery unit
PR030/Bpowersupplyunitisaseparateunitforpoweringrelay,autotestandtriptest,andcheckingswithopenCB.