User Manual

DIR 1000587R0002 (L3821)
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3.4.4 Settings Menu
ThecongurationparametersintheSettingsmenuarepassword-protected. Amongthemost
signicantvalues that can be selected,note the neutral threshold (values 50%,100%, 150%,
200%),mainsfrequencyofinstallation(values50Hz,60Hz).Foramoredetaileddescriptionof
thesettingsforthemodules,refertothedocumentationonthemodules(ch.4).
1/5
Protections settings
Measurements
Settings
Protections
Menu
1/9
Circuit breaker settings
Main Frequency
Modules
Circuit Breaker
Settings
1/3
Neutral settings
Neutral Protection
Unit installation
Ground protection
Circuit Breaker
On
Neutral threshold
Enable
Neutral protection
21/2
Enter↵
Enter↵
Enter↵+PWD
3.4.4.1 Settings Menu table
Parameter/Function Values Notes
Circuit (*) Neutralprotection
breaker  Enable ON/OFF
   Neutralthreshold 50%-100%-150%-200%
Mains frequency 50Hz-60Hz
Modules Module
   Communicationmodule ifinstalled seepar.3.4.4.4.2
   LocalBusunit Installed-Notinstalled
(*)Withthethree-polecircuitbreaker,the“3P+N”optionisdisplayedandmustbeenablediftheoutsideneutralisinstalled.
Parameter/Function Values Notes
Data Logger Enable ON/OFF SeeAnnexpar.5.1    
   Samplingfrequency      
   Trigger      
   Stoppingdelay      
   Restart      
   Stop
Measurement interval  from5to120min,step5min  
Harmonic distortion  ON/OFF Thewarningindicatesthatthedistortionexceeds 
   factor2.1
System Date
  Time
  Language English/Italiano/Français/Deutsch/Español
  Newpassword 
Display Contrast 
3.4.4.2 Adjusting the neutral
Neutralprotectionisnormallysettoacurrentvalue50%oftheadjustmentmadeonthephases.
Insomeinstallations,whereparticularlyhighharmonicsoccur,thecurrentrunningonneutralmaybehigherthanthatofphases.
IntheLSIG-MMreleases,thisprotectioncanbesetforthefollowingvalues:I
n
N=50%-100%-150%-200%*I
n
.
Thevaluesthatcanbeusedtoadjusttheneutralaregiveninthetablebelowforthevariouspossiblecombinationsbetweentypesofcircuit-
breakerandadjustmentofthresholdI
n
.
Neutralvalue(InN)adjustmentwillmeetthefollowingformula:I
1
xI
n
N ≤Iu
Whena4-poleCBisavailable,thissettingiscontrolledbytherelaywhichsignalsthefaultthroughaLED(seepar.3.5.1),andautomatically
adjuststheparameter,withintheacceptedlimits.
Whena3-poleCBwithexternalneutralisavailable,therelaydoesnotperformanycontrolandsettingsaretobeadjustedbyuser.
E.g.: With140G-N1200withRatingPlugat400A,Iu=1200AandI1=1In,adjustmentofI
n
Nmaybe50-100-200%
 With140G-N1200withRatingPlugat800A,Iu=1200AandI1=1In,adjustmentofI
n
Nmaybe50-100%
Note 1: I
1
=1I
n
setting is intended as maximum adjustment of protection against overloads. Actual maximum allowable adjustment must take into account any temperature
derating, terminals used and altitude, or In (rating plug)
≤ 50% of circuit breaker size.