Owner's manual

<4 ANALYZER COMPONENTS> 4-2
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
approx5”Wx4”H(130mmx100mm).Aclearlaminatedsafetyglasswindowismountedtotheinsideof
the door with stainless steel fasteners and a weather tight gasket. This allows for external viewing of the
actualdisplaywithoutopeningthedoor.Therighthandsideofthedooraccommodatesakeypad(30keys,
stainlesssteel)whichisalsooperatedexternallywithoutopeningthedoor.
Backplane Circuit Board
Large(approx.10”Hx15”W)printedcircuitboardthatmountsinsidetheenclosure.Theboardhas
several integral circuits and several connectors to accommodate various plug-in boards. The board is
designedsuchthatanyeldterminationsarelocatedalongtheloweredgeoftheboardviapluggable
terminalblocksforcustomeroreldcableinterface.
Allcomponentsanddevicesontheboardaredesignedforextendedtemperature(-10to+80ºC)andlow
drift operation.
TheBackplaneCircuitBoardcontainsthefollowingintegratedcircuits:
 •DCPowerInput
 •DCPowerDistribution
 •WatchdogCircuit
 •DisplayBacklightPowerInterrupt
 •AlarmRelays
 •RemoteCalibrationInitiation
 •CalibrationValveDriverRelays
 •LaserTemperatureandCurrentControl
 •Boardtemperature
DC Power Input.
TherearefourpluggablescrewterminalslocatedonthelowerrighthandsideoftheBackPlane.Theseare
usedforconnectingthe24VDCpowerinputsupply.Thesearefactoryconguredtoreceivepowerfrom
the adjacent power supply enclosure. Therefore, the analyzer power input requirement is AC voltage and a
24VDCpowersupplyisintegratedtotheanalyzer.
ThereisanadjacentOn/Offminiaturetoggleswitchandre-settablethermalfuse.
Thesingle24DVCpowersupplyisdistributedtovariousoutputpowerchannels.Eachoutputpower
channelhastheappropriateDC-DCconverter,regulator(s),lteringcapacitorsandstatusLEDs,etc.All
accessiblevoltagesintheControlmodulearebelow24V.A65V,10mApowersourceisprotectedbya
cover with a “High voltage” warning sign.
Watchdog Power Interrupts
Thepoweroutputchannelsformicroprocessorshavecontrollogiclines(TTLactivated).Theseallowfor
watchdoginterrupt/resetfunctionality.
Alarm Relays
Therearethreealarmrelaycircuitsontheboard.ThesearecapableofactuatingFormCSinglePole
DoubleThrow(SPDT)relays.Thethreeconnectionsofeachrelay(Common,NormallyOpenandNormally
Closed)areroutedthroughtheboardtoeldterminals.Thecontactsareratedforamaximumof1A@
24VDC.WedonotrecommendapplyingACvoltageacrosstheserelaycontact.
Thepluggableeldterminalsaremountedontheloweredgeoftheboard,justtotheleftsideoftheDC
powerinputterminals.Theappropriaterelay(s)isactuatedwhenthereisananalyzerWarning,Faultand/or
Level Alarm. The Power off condition is the same as alarm condition i.e. they are powered in ‘normal’
(or no alarm) condition.
Remote Calibration Initiation
Acalibrationroutinecanbeinitiatedfromaremotelocation(upto300maway)usingcontactclosures.
TheBackPlanehascircuitrysuchthatitcanmonitorforareturnvoltage.Thereturnvoltagecomesfrom
remoteVoltFreeContacts(VFCs)atthecustomerDCS(orothercontrolsystem).
Thecircuitsincludesuitableprotectionagainstinadvertentshorting/groundingofthesupply24VDCorthe
application of excess power to the monitoring circuit. There are three sets of remote contact monitoring
circuitsontheBackPlane.