Iskra MC320 - Pulse (S0) Module; Relay (Alarm) Module (MC350, MC350 H and MC330 Only); Functions of Output Modules (Pulse and Relay)

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SETTINGS
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34 Measuringcentres– M
C
320,MC330,MC350&MC350H‐User’sManual
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Relayoutputandapulse outputcanalsobeselectedviaakeyboard.Whenselectingsettingsofenergy and
quadrantsforacertaincounter,onlypresentselectionispossible,whilemoredemandingsettingsareaccessible
viacommunication.
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MC320onlysupportspulseoutputandtariffinputmodules;PleaseseechapterTypedifferences,pages11.
Pulse(S0)module  
Itisasolidstate,optocoupleropencollectorswitch.Itsmainintentionistobeusedasapulseoutputforselected
energycounter,butcanalsobeusedasanalarmorgeneralpurposedigitaloutput.
FordescriptionofoutputfunctionalityseechapterFunctionsofDigitaloutput(PulseandRelay)modulesbelow.
Relay(alarm)module(MC350,MC350HandMC330only)  
Itisarelayswitch.Itsmainintentionistobeusedasanalarmoutput,butcanalsobeusedasapulseorgeneral
purposedigitaloutput.
AparallelRCfilterwithtimeconstantofatleast250μs(R∙C≥250μs)shouldbeusedincaseofasensitivepulse
counter.RCfilterattenuatesrelaytransientsignals.
FordescriptionofoutputfunctionalityseechapterFunctionsofDigitaloutput(PulseandRelay)modulesbelow.
Functionsofoutputmodules(PulseandRelay)  
ToDigitaloutputs,PulseandRelay,differentfunctionscanbeattached.AllcanbesetwithMiQensoftware.
PULSEOUTPUTOFENERGYCOUNTER
Acorrespondingenergycounterisdefinedtoapulseoutput.Anumberofpulsesperenergyunit,pulselength,
andatariffsinwhichoutputisactiveareset.
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WARNING!
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PulseparametersaredefinedbyEN62053−31standard.Inchapter Calculaon of
recommendedpulseparameters,belowasimplifiedruleisdescribedtoassistyouinsetting
thepulseoutputparameters.
MainmenuSettingsInputs/OutputsI/O1/2/3/4SettingofpulseoutputOK
Thepulsemodulecanalsofunctionasanalarmoutputwithmaximumcurrentload30mA.
CALCULATIONOFRECOMMENDEDPULSEPARAMETERS
Number of pulses per energy unit should be in certain limits accordingtoexpectedpower.Ifnotsothe
measurement from pulse output can be incorrect. Settings of current and voltage transformers can help in
estimationofexpectedpower.
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Principle described below for pulse setting, where e is prefix, satisfies EN 62053‐31: 2001 standards pulse
specifications:
eWh1p100eW155,1 
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Examples:
Expectedpower
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Pulseoutputsettings
150‐1500kW
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1p/1kWh
1.5‐15MW
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100p/1MWh
15‐150MW

10p/1MWh
150‐1500MW

1p/1MWh
CALCULATIONOFRECOMMENDEDPULSEPARAMETERS
IfDigitaloutputisdefinedasanAlarmoutput,itsactivity(trigger)isconnectedtoAlarmgroups.Multiplealarm
groupscanbeattachedtoitanddifferentsignalshapesdefined.Formoreinformationonhowtodefinealarm
groups,seechapterAlarmsonpage36.