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4Central Unit
Thecentralunitperformsthemajorityofthesafetyand operationalfunctionsoftheMIREL
VZ1trainprotection system.
§Filteringand decodingtransmittedinformationfromtrackinfrastructure
§Filteringand evaluationofthesignalfromtheincrementalRPMsensoron thelocomotive
(measuringspeedtravelleddistanceand directionoftravel)
§Calculationofsafetyalgorithms
§Monitoringpressureinthemainbrakeline
§Monitoring inputs(controlswitches, dead man'sbuttonsand pedals,drivecontrollers,the
directacting brake,directioncontrollers,tractionsystemswitch, etc.)
§Sending outputs(controllingtheEPVvalve,horns,blueandredindicators,etc.)
§Communicationwiththesignalrepeaters
§Systemdiagnostics
§Systemfunctionaltest
§Indicators
8LEDindicatorsareinstalledon thefrontpanelof thecentralunit.Nocontrolelementsare
locatedon thecentralunitand thereisno needfortheoperatortointerferewiththecentral
unit during operationof thetrainprotectionsystem.
Thecentralunit ispoweredfromthelocomotive'sbatterysource.Powerisprovidedthrough
aseparatecircuitbreakerdedicatedforthetrainprotection systeminstalledwithother
breakersforthelocomotiveorinanotherspecificlocation depending on thespecifictypeof
locomotive.Thereisno operating situation whereswitchingoff thesystem'spowerbreaker
isrequired.OtherMIRELVZ1trainprotection systemperipheralsarepoweredbythecentral
unit.
ThecentralunitinBOXTUXversion isconstructedwitha19"widthtocomplywiththeIEC
60297 standardforrack-mountedequipment.Thedesign heightisaUmodule=44.5mm.
Centralunitmodulesareinstalledinan ALenclosure.Indicatorsareinstalledon thefront
panel. A72-pinDD-typeindustrialconnectorisinstalledon the rearpanel.
Mechanicaldesign ofcentralunitinBOXTUGversion havemodulesofcentralunitlocated
inaseparateAL-boxand isavailableintwodifferent modifications,depending on assembly
orientation.Indication elementsarelocatedatfrontpanel,37-pinconnectorofDBtype,25--
pinconnectorofDBtype,15--pinconnectorofDBtypeand two10-pinindustrialconnectors
oftypeHummelM16.
StructuraldesignofcentralunitinBOXKOGhascentralunitmoduleslocatedinaseparate
AL-boxofmodularBOXKOG-typestructuralsystem,foreasydevicefitting instandard19”
caseswithheight3U..Indicationelementsarelocatedatfrontpanel,37-pinconnectorof
DBtype,25--pinconnectorofDBtype,15--pinconnectorofDBtypeand two10-pinindus-
trialconnectorsoftypeHummelM16.
Thecentralunitwilloperateinanyposition.Thecentralunitisinstalledinsidethelocomotive
basedon thespecifictypeoflocomotive.Access tothefrontpanelwithoutrequiring any
disassemblyissufficientforordinaryoperating conditionsand whenmaintenanceisre-
quired.
