203.743.6741 • 203.798.7313 www.preferred-mfg.com Instruments & Controls Catalog 25 Instruments & Controls 160 BURNERMATE UNIVERSAL BOILER CONTROLLER Overview The BurnerMate Universal offers complete boiler control in an economic, off-the-shelf, pre-programmed controller. Separate processors are used for flame safeguard and combustion control for NFPA 85 compliance. Configuration is done in the field using the LCD key pad, the optional touch screen, or our exclusive BMU_Edit software on your PC. BMU functions include: • Advanced flame safeguard control including first out annunciation, nuisance trip protection, and lockout snapshot • Combustion control (jackshaft, parallel positioning, with optional oxygen trim) using up to ten servos and up to four Variable Speed Drives (VSDs) • Draft control • Feedwater control: single, two-element, or three- element. • Large 10” color touch screen with pre-programmed graphic pages The BurnerMate Universal is available for immediate delivery, requires no programming, and is recognized by U.L. Advanced Flame Safeguard Control The BurnerMate Universal takes burner safety to a higher level. Instead of one digital input proving the boiler limits are made, the BMU accepts over forty boiler limits into separate digital inputs. This makes first out annunciation easy, as well as advanced diagnostics to quickly pinpoint why a boiler tripped and what needs to be done to bring it on line again. One or two flame scanners can be used for added reliability, or increased boiler safety. Flame safety control features include: • Support for up to three fuels (oil, natural gas, and a second gas fuel). • Fuel changeover can be initiated locally or remotely either shutting down the boiler during the fuel change, or changing fuel “on-the-fly”. Fuel change can be initiated manually, or remotely via contacts or Modbus • Monitors up to nine recycling limits, up to 33 shutdown limits and one or two flame scanners. • All limit inputs are 120 VAC, wired in parallel, and separately annunciated • During a shutdown, all major status bits are recorded and saved for up to the last 10 lockouts. • Adjustable time delays are available for many limits to avoid trips • Gas valve leak test logic can be configured (with or without a vent valve) • Automated daily low water cutout blowdown with level switch test can be configured to alarm or shut down the burner if a faulty low water cutout switch is detected. • Optional oil gun purge logic can be configured (blow-through into the furnace, or suctioned back out of the gun via scavenger pump) • High flue gas temperature shutdown is included for additional dry boiler protection • To reduce combustibles in the furnace, the burner can be driven to low fire before it is shut down Fuel Air Ratio Control The BMU supports single point positioning (jackshaft) combustion control and parallel positioning combustion control. Oxygen trim can be added to either control strategy by adding a Preferred ZP probe. A link trim actuator (LTA) can be used to vary the air output in a single point positioning system. Fuel valves and air dampers are controlled by high precision (0.1° accuracy) digital electric servos. Each digital servo includes a microprocessor and all servos are networked to the BMU chassis. BMU fuel-air ratio control functions include:
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BURNERMATE UNIVERSAL BOILER CONTROLLER Overview Instruments/Cont… · Boiler Control Functions Many of the most common boiler control functions are incorporated in the BMU. This
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203.743.6741 • 203.798.7313www.preferred-mfg.com
Instruments & Controls
Catalog 25
Inst
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ents
& C
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BURNERMATE UNIVERSAL BOILER CONTROLLER Overview
The BurnerMate Universal offerscompleteboilercontrolinaneconomic,off-the-shelf,pre-programmedcontroller.Separate processors are used for flame safeguard andcombustioncontrolforNFPA85compliance.ConfigurationisdoneinthefieldusingtheLCDkeypad,theoptionaltouchscreen,orourexclusiveBMU_EditsoftwareonyourPC.BMUfunctionsinclude:
• Advancedflamesafeguardcontrol includingfirstoutannunciation, nuisance trip protection, and lockoutsnapshot
FuelAirRatioControlTheBMU supports single point positioning (jackshaft)combustion control and parallel positioning combustioncontrol.OxygentrimcanbeaddedtoeithercontrolstrategybyaddingaPreferredZPprobe.Alinktrimactuator(LTA)canbeusedtovarytheairoutputinasinglepointpositioningsystem. Fuel valves and air dampers are controlled byhighprecision(0.1°accuracy)digitalelectricservos.EachdigitalservoincludesamicroprocessorandallservosarenetworkedtotheBMUchassis.BMUfuel-airratiocontrolfunctionsinclude:
• Atomizing (steam or air) pressure (or differentialpressure)controlsetpointscanbeinputasafunctionoffiringrate
• Windbox oxygen control (monitored by a separateoxygen analyzer) allows the technician to enter awindboxoxygenvs.firingratecurve.TheBMUtrimstheFGRdamper(orFGRfanVSD)tomaintainFGRflow(asmeasuredbywindboxoxygencontent)oncurveatallfiringrates
BoilerControlFunctionsMany of themost common boiler control functions areincorporatedintheBMU.Thissimplifiesthecontrolsystemandofteneliminatestheneedforadditionalrelays,timers,orothercontrolhardwaremountedintheburnermanagementsystemenclosure.Additionally,theBMUacceptshard-wiredinputsforburneroff/onandremotefiringratethatmakeiteasilyintegratedwiththePreferredChiefDispatcherlead/lagsequencer.Othercontrolfunctionsinclude:
BMU-SM-15 Servo Motor with optional ‘QD’electrical Quick-Connects.
HighPrecisionDigitalElectricServoMotors
The servomotors provided as part of theBurnerMateUniversalareuniquetoPreferred.TheBMUcommunicatesdigitallywith amicroprocessor controller board in eachservo.Thecontrollerboardpreciselypositions theservomotorandperformscontinuoussafetydiagnostics.Ahighprecision, sealed feedback potentiometer continuouslyreportstheservopositiontothecontrollerboardandbacktotheBMUchassis.ThecontrollerboardincludespushbuttonsforZERO,CW,andCCW“jogging”oftheservomotor.Inaddition, LEDsprovide important diagnostic informationfor each servomotor. Servos are availablewith quick-disconnectfittingstoreducewiringtime.Torqueratingsfortheservomotorsstartat3ft-lbforsmallcontrolvalvesandgoupto720ft-lbforlargeairdampersorstackdampers.
BMU“positionpacing”isfullyautomatic,providesforsafercombustion control and drastically improved firing rateresponsetimesandrequiresnoadjustmentsbytheuser.
FlameScannersTheBurnerMateUniversalsystemincludesalineofPreferredInstrumentsflamescanners.Digital,microprocessor-basedscannersareavailableinultraviolet(UV)infrared(IR)andself-checkingUVmodels. Flamedetector and amplifierareintegratedintothescannerheadtoeliminatetheneedforseparate(panel-mounted)scanneramplifiers.Scannerhousingsaremachinedfromanodizedaluminum.Scannermountsare1/2”NPTF for theUVand IRversions,and1”NPTF for theself-checkingUVmodel.Eachscannerincludes a cooling air port for hot or dirty applications.Scanners include two LEDs--one blinks intermittentlydependingontheintensityoftheflamesignal,theotherLEDilluminateswhenthescannerclosesthe“FlameDetected”relayoutput.Electricalconnectionisbyathreadedmilitary-style quick disconnect.The scanners output a contactclosure forflameprovinganda4-20mAflamestrengthsignalfortroubleshootingdiagnostics.OneortwoscannerscanbeconnectedtoasingleBMUcontroller.Allscannersincludethesamepinoutandmilitary-stylequickdisconnectallowingforscannerstobeeasilychanged.TheBMUcanbeusedwith any othermanufacturer’s flame relay thatproducesa120VACcontactclosurewhenflameisproven.
BMU scanners available in ultraviolet, infrared, and self-checking ultraviolet. All connect by military-style quick disconnect fittings.
Up to four servos connect to each BMU-JBOX terminal. Each servo has a low voltage and high voltage quick connect cable. A single BMU-CABLE, and 120 VAC H, N, and G wires provide the
Digital CommunicationTheBurnerMateUniversal communicates via a secure,safetyrateddigitalprotocolwiththerequiredLCDkeypadandtheservonetwork.TheBMUchassiscommunicatesviaModbustotheoptionaltouchscreenOITandoptionalCommStationOIT-Bridge.BoththetouchscreenOITorOIT-BridgeactasprotocolconvertersandcanspeakModbus,ModbusoverEthernet,oranumberofotheropendigitalprotocolstoaBuildingAutomationSystem(BAS)orEnergyManagementSystem(EMS).BoththetouchscreenOITandtheOIT-Bridgearepre-loadedwithover75standardgraphicpages.Boiler overview screens canbe field-selected toresembletheboilerbeingfired.
Digital Inputs & OutputsAlldigital inputs to theBMUare120VAC from industrystandardswitchesandcontacts.Eachofthemostcommonboiler/burnerlimitswitchesispre-assignedtoaparticulardigitalinput.Sparelimitinputsareprovided.
Windbox Oxygen FGR ControlManymodern lowNOxandultra lowNOxburnershavechallenging limits of flammability.They require preciseamountsoffluegasrecirculation(FGR)forallfiringrates,despite changes in boiler load and ambient conditions.SincemeteringFGRflowratesisimpracticalwemeasurewindbox oxygen for closed loop control with a reliableprocess variablemeasurement.Automatic control ofwindboxoxygencontenthasprovenaneffectivemeansofconsistentFGRflow.
Atomizing Steam Pressure Control Traditionalatomizingsteampressurecontrol ishamperedby the limited turndowncapabilitiesof existingatomizingsteamdifferentialpressureregulatingvalves.Theoilflameisoftenover-atomizedat lowfire,under-atomizedathighfire,orboth.Thisproblemhasbeensolved,butbyusingveryexpensivecontrolvalveswithself-containedregulators/positioners.TheBurnerMateUniversalcontrollermonitorsatomizingsteampressure,andmodulatesaninexpensivequarterturnflowcontrolvalvetodelivervirtuallyanysteampressurerequiredatanyfiringrate.Alternately,anatomizingsteam/oildifferentialpressuretransmittercanbeusedandtheBurnerMateUniversalwillholdthesteam/oildifferentialpressure“oncurve”atallfiringrates.
Becausethissystemusesatightshut-offcharacterizedballvalveinsteadofaself-operatedpressureregulatingvalve,aseparateatomizingsteamshutoffvalve isnot required.Simply program the controller so that atomizing steampressureiszeroduringboilerstandby,andtheflowcontrolvalvewillbedrivenfullyclosed.Manyboilertechniciansliketoopentheatomizingsteamvalveduringpurgetoblowanywateroutofthelineandgetthelinehotpriortolightingofftheoilburner.TheBurnerMateUniversalprovidesseparate
FGR
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Boiler AE
Windbox Oxygen
VFD Motor
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BMU Controller
S
Fresh Air
Fixed PositionDamper
Gas FCV
Windbox oxygen FGR control schematic
BMUController
SOil
AtomizingSteamorAir
S Oil GunPT
OilServo
AtomizingPressureServo
AtomizingPressureXmtr
OilSSOV
OptionalShutoffValve
Atomizing steam pressure is monitored and held “on curve” at all boiler firing rates.
In this configuration, atomizing steam/oil differential pressure is monitored and held “on curve” at all boiler firing rates.
Fuel Flow Meter Display and Totalizing Tomonitor and track fuel usage (and savings) theBMUdisplaysandtotalizedfuelflowsforuptothreefuels.FuelflowsarealsoavailableonModbustocommunicatewithaplantEnergyManagementSystem(EMS)
Low Fire Fuel Transfer TheBurnerMateUniversalallowstheusertochangefuelswithoutshuttingdowntheboiler,inaccordancewithNFPA85Procedures for Single Burner Simultaneous Firing of Two Fuels for Fuel Transfer Only.Thefuelchangeoverisdoneatlowfire,butthelossofproductionismuchlessthanshuttingdowntheboiler,purging,andre-lighting.Thisprocedurecanbeveryconvenientforlightingoffdifficultoil-firedburners,orNo.6oilfiredburners.
3. Thecurvedataforthenewfuelischeckedforerrors.4. TheBMUwaitsforthenewfuel’slimitstomake.5. Bothfuelactuatorsaresenttotheirignitionpositions.6. The controller ‘paces’ to the ignitionpositionwith all
combustionactuators/VSDs‘oncurve’.7. TheBMUwaits until both fuels reach their ignition
Tandem Oil/Gas Valve Servo Option For retrofitapplications, theBurnerMateUniversalallowsreplacementofthejackshaftactuatoronagasandoilfiredburnerwithasingleBMUservoandmaintainsthelinkagetotheoilandgasvalves.Theairdamperistakenoffthelinkageanddrivenbyasecondservoforparallelpositioningcontrolofbothfuels.AZPprobecanbeaddedtothesystemforparallelpositioningwithoxygentrimcontrol.Thisfeaturesreducesthenumberofservosrequiredforagas/oilburnerretrofit,andspeedsinstallation.
The“expanded”chassissupportsalloftheabovefunctionsplusdraft,feedwatercontrol,atomizingsteam/airpressurecontrol,FGRwindboxoxygencontrol,aswellasflowmetersignal display and totalizing. Physically, the expandedchassiscontainsanextraanalogI/Oboardmountedwithinthechassishousing.
BMU Standard Enclosure OptionsFourstandardenclosureoptionsareofferedfortheBMU.ThestandardenclosuresareNEMA12,hingedontheleft,includetwolockingmechanisms,andfeaturethefollowingcomponents,mountedandwired:
• The panel-mounted devices are factory-wired asshown.All other devices are field-wired directly totheBMU terminals.Standard drawings showing thepanelarrangementand the internalwiringschematicarepresentedintheBurnerMateUniversalInstructionManual.
BMU Digital Servo ActuatorsBMUservosare available in output torques from3 ft-lbto720ft-lbs.Eachincludesanactuatorpositionerboard,and integral feedback potentiometer. The feedbackpotentiometer is used to prove servo position therebyeliminatingtheneedforauxiliaryproofofpositionswitches.Servoscanbeusedforthefollowingcontrolfunctions:• Natural gas, fuel oil and/ or “other gas” flow control
ZPprobesshouldbefieldcalibratedwithtestgasesevery6-12months. However, a new probe includes factorycalibrationparametersthatcanbeenteredintotheBMULCDkeypad.Thiseliminatestheneedtohavecalibrationgasduringtheinitialstart-up.
BurnerMate Universal OIT Touch ScreenAll of the control functionsof theBurnerMateUniversalcan be accessed through the LCD key pad.TheBMU-OIT-10colortouchscreendisplayisavailableforenhancedgraphicsandcommunications.Supportedcommunicationprotocolsinclude:
• 10/100 Base Ethernet, Modbus TCP/IP, ModbusRTU,SCADA/BASconnection,BacNet IP, andBMUconnection
• OneRS-485port
Over 75 pre-programmedgraphics pages are included.Boiler overview screens are field-selectable to fit theapplication. Typical Boiler Overview Screen
Advanced DiagnosticsOn-boarddiagnostics in theflamescanners, andbuilt into theBMU,make trouble-shootingof a flamescanningproblemeasy.AllBMUscannerscontaintwoLEDsonthefrontofthescanner.The“flamestatus”(left)LEDblinksatarateproportionaltotheflamesignalstrength.The“flamerelay”LEDilluminatescontinuouslywhentheflamesignalissufficienttoclosetheflameprovenrelay.
Inaddition to the twoLEDs, thescannersoutputa4-20mAsignaltotheBMU,proportionaltotheflamesignal.TheflamesignalstrengthcanbeviewedfromseveralscreensontheBMU.
ScannerApplicationConsult the burnermanufacturer to determine themosteffectiveflamescanner type for yourburnerapplication.However, typicallyultraviolet(UV)scannersareusedforgasflamesandinfrared(IR)scannersareusedforheavyoil,orsteam-atomizedlightoilflames.Preferred’sUVflamescannersaretraditionalUVtubescanners.TheIRscannerusesaleadsulfidedetector.
BMU_EditIn the tradition of PCC-III_Edit and PWC_Edit, theBurnerMateUniversalisavailablewithBMU_Editsoftwarethat runs on yourWindows-basedPC and allows youto set the parameters of the BMU from your laptop.CommunicationbetweentheBMUandyourPCisdoneviaastandardUSBA/B(printer)cable.
Easy pull-downmenusand text boxes allowparameterselectionsinyourofficetobewrittenintotheBMUchassiseither before installationor during commissioning.Oncecommissioningiscomplete,BMU_Editallowsyoutoreadfrom the BMU chassis and save the latest parametersettingsandcurvedatainthePC.ThissettinginformationcanbeusedtosetupadditionalBMUsorusedasanarchiveiftheBMUconfigurationbecomescorrupted.
BMU_Edit includestoolsthatallowtheperformanceofaparameterchecktomakesureparametershaven’tbeensettoincompatiblevalues.ThesoftwarewillalsoconvertsettingdatafromoneBMUversiontoanother.Inaddition,BMU_Edit can compare two BMU configurations andmakea detailed list of the differencesbetween the twoconfigurations.Thisfeatureisimportantwhenmorethanonetechnicianmayworkonthesameboiler.
The compare function tracks any changes made to a BMU configuration for easy trouble-shooting.
The curve viewer function allows a technician to quickly view all the combustion related curves input in a BMU. This can be useful when diagnosing a problem. It can also be used to archive curve information quickly and easily. Parameter settings and fuel-air curves can be written back to the BMU, but the points must be verified before leaving commissioning mode.
Digital Communication OptionsManyplantownersandengineersdesiretomonitorthestatusoftheboilerroomremotely.TheBMUhasModbusaddressesassignedforthestatusofmanydigitalandanaloginputsandoutputs.ThisdataisaccessiblebyModbususingtheRS485connectionontheBMUchassis.TheRS485connectioncan
This is the most common digital communication scenario used with the BMU. The OIT touch screen is supplied for its graphics capability, and is also used to convert the RS485 bus to Ethernet. There are many terms for the control system the BMU typically interfaces with, including: Distributed Control System (DCS), Building Automation System, (BAS) Energy Management System (EMS) or Preferred Supervisory Control and Data Acquisition System (SCADA). Most of these systems can communicate via Modbus over Ethernet or have converters that can communicate via Modbus.
As an economical alternative to the OIT touch screen, Preferred offers the OIT-Bridge that provides a pre-configured communication interface between the Modbus RS485 BMU chassis and Modbus over Ethernet. The OIT-Bridge is pre-configured to the Modbus addresses of the BMU. It offers the same communication capabilities as the OIT touch screen at a much lower price.
A l l o f the BMU chass is opt ions communicate using Modbus protocol on an RS485 bus without any additional equipment required.
This is the ultimate in-plant monitoring capability in an entirely pre-engineered package. Up to three boilers can be controlled and monitored using off-the-shelf BMU boiler masters, a Chief Dispatcher plant master, and the CommStation communication interface that provides a single Ethernet connection to the plant. Because the components of this system are completely pre-engineered, this is a very economic package that will typically be competing with a custom engineered PLC-based system.
1. Quality AssuranceTheboilercontrolsystemshallbemanufacturedandsupportedintheUnitedStatesbyPreferredInstruments.Theburnerfuel-air-FGR ratio control systemand the burner flame safeguardsystemshallbemanufacturedand labelled inaccordancewithU.L.372,U.L.1998,andCSAC22.2#199.SimplysupplyingULrecognizedindividualcomponentsisnotsufficient.Theassembledcontrolcabinetasawholemustbeinspectedforproperwiringmethods, fusing, etc., andmust be labeled as conforming toUL508AandCSAC22.1#14.InspectionandlabelingshallbesupervisedanOSHAapprovedNationallyRecognizedTestLab(NRTL).ThesystemshallcomplywithNFPA85“RequirementforIndependence,” the flamesafeguard systemshall beprovidedwith independent hardware shall bephysically separated fromthecombustioncontrollogic.2. Parallel Positioning Combustion ControlAparallelpositioningcombustioncontrolsystemwithoxygentrimand(optional)VSDcontrolshallbeprovidedforeachboiler.Eachsystemshallbedesignedtoprovidecontinuousboileroperationwithinboilerdesignlimitswithahighlevelofsafetyandenergyefficiency. As required the system shall provide continuousmonitoringandcontrolofsteampressure(orwatertemperature),waterlevel,combustionairandfuelratio&fluegasrecirculation.Thesystemshallbefullyintegratedtotheburnermanagementsystemtoprovidefullyautomatic,safeandreliablestartupandshutdown.Positionpacingshallbeused toensureup toeightservoswillbecontinuallymonitoredandheld“oncurve”duringboilerloadchanges.3. Oxygen Trim SystemProvideaboilerbreechingmountedin-situ,zirconiumoxideoxygenanalyzer for eachboiler.Extractive typeoxygenanalyzersarenotacceptableforcombustioncontrol.Theprobeshallbeofasuitablelengthtosensetheoxygenlevelinthemiddlethirdofthebreeching.Allwettedpartsshallbestainlesssteel.Theoxygenanalyzershall:• Includecontinuousself-diagnosticswithdiagnosticcodesfor
atleast10commonfaults.• Automaticallysendthe trimcontrol to the ‘null’positionand
• Analyzercalibrationshallbepushbuttonsemi-automatic(notrim pots) with English language prompts and diagnosticmessages.Analyzeroutputshallbefieldselectableas0-10%or0-21%withoutfieldre-calibration.
4. Flame Safeguard System (FSG)Integral to the control system furnished shall be a BurnerManagementSystem (BMS) /FlameSafeguardSystem (FSG)controller.Thesystemshallbedesignedtoensurethesafestart-up, on-line operation, and shutdown of fuel firing equipment.Burnermanagement system components shall be located inthe combustion control cabinet and shall be fully integratedforautomaticsequencingof lightoffandshutdown.ForsafetytheBMSmicroprocessorandBMSVDshallbeonaphysicallyseparatecircuitboard.Microprocessor-basedFSGshallprovide:safetyinterlocks,flamemonitoringprotection, and timed sequences.Sequences shallincludeforceddraftfanstartandstop,furnacepurge,burnerlightoffandshutdownandpost-purge.TheFSGshallbecapableoffiringuptothreefuels(twogasfuels,oneoilfuel),onefuelatatime.Fuelchangeovershallfromoiltogas,orgastooilfiringshallbeaccomplished“onthefly”atlowfirewithoutboilershutdownperNFPA.A panel front-mounted English language, four line, twentycharacter LCDmessage display shall be provided to displayflamesignal strength, startup and shutdown sequence status,alarm,systemdiagnostic,first-outmessagesandburnerhistoricalinformation.Historicalinformationshallincludethestatusofalllimitsandservosforthelasttenlockouts.To ensure boiler lowwater cutouts areworking correctly, thecontrollershallbecapableofperformingadailyautomaticwatercolumnblow-downtest.Theusershallselectthetimeofdayanddurationofthewatercolumnblow-downtest.Thecontrollershallensure the lowwater cutoff switches are functioning correctly,andalarmtheoperatororlockouttheboilerifitdetectsaswitchmalfunction.To prevent nuisance trips, the flame safeguard system shallaccommodate two flame scannerswith one required to proveflame.Thecontrollershallprovide120VACor24VDCscannerpower,andaccept twoanalog inputs indicatingflamestrength.Flamesafeguardsystemshallincludeoilgunpostpurgeforoilfiring.Assuredlowfirecutoffshallbeprovided.Foradditionalnuisancetripprotection,fieldadjustabletimedelaysshallbeprovidedforF.D.fanstart,freshairdamper,minimumairflow,lowdraftcutout,andfuelpressurelimits.Fivefieldselectableauxiliaryrelaysshallbeincludedforcommonalarm,auxiliaryfanstart,blow-down,flameon,fuelvalveopen,hotwaterpumporvalve.Toprotectagainstdryfiring,anoptionshallbeavailableforhighfluegastemperaturelockout.Toensureairswitchesarefunctioning,aminimumairflowpressureswitchandpurgeairflowpressureswitchsafestartcheckshallbeincluded.5. Feedwater ControlProvideaboilerwaterlevelcontrollercapableofsingle-,two-,orthree-elementfeedwatercontrolwiththeabilitytoautomaticallyswitchbetweencontrolstrategiesdependentonsystemdemands.6. Draft ControlThecontrollershallprovidetwo-elementdraftcontrolutilizingaPreferredInstrumentsJC-22XMTRdrafttransmitter.Burnerfiringrateshallbeusedasafeedforwardforimprovedresponsetoloadchanges.Thecontrolshallprovidebothautomaticandmanualdampercontrol.Alladjustmentsshallbemadefromthefrontpaneldisplayinengineeringunits.
7. Flue Gas Recirculation Valve ControlThecontrollershallhaveacharacterizablesetpointcurveoutputsignal for the fan to vary or damper its speed.All the logicrequired to automatically signal pre-purge, postpurge, light-off,andburnermodulatecyclesshallbeprovidedwithinthecontroller.Alternatively,thecontrolwillregulateFGRaccordingtoapresetwindboxoxygensetpointcurve.8. Windbox Oxygen FGR ControlThecontrollershallacceptananalog input forburnerwindboxoxygentobeusedasameasureoffluegasrecirculationrate.During commissioning, awindboxoxygen vs. firing rate curveshallbeestablished.Thecontrollershallmodulatethefluegasrecirculationvalve (or fluegasblowermotorVSD) tomaintainwindboxoxygenonthepre-establishedcurvedespitechangesinambientconditions.9. Atomizing Media Pressure ControlThecontrollershallacceptaninputforatomizingsteampressureoratomizingsteam/oildifferentialpressure.Duringcommissioning,anatomizingsteampressure(oratomizingsteam/oildifferentialpressure)curveshallbeestablished.Thecontrollerwillmodulateanatomizingsteamflowcontrolvalvetokeeptheatomizingsteampressureoncurveatallfiringrates.10. Additional Control Requirements:• Minimumnumberoff(x)Curvestobeprovidedperservo:6• Minimumnumberofpointsperf(x)Curvetobeprovided:11• ColdFGR lowfirecutbackshallbeprovidedwhenFGR is
11. OIT Color Touch ScreenProvideasanoptionaten(10)inchOperatorInterfaceTerminal(OIT) designed to provide local operation, graphic display ofinformation, alarmmessage display, historical and real timetrending,remotecontroltuning,x/yplotsoffuel-aircurvedatafor intuitivecommissioning,Ethernetconnectivityandstandardinternetbrowserremotecommunication.TheOITshallcontainaminimum of 75 graphic pages and be networked to theboilercontrolandburnermanagementsystems.TheOITshallprovidegraphicpagesallowing step-by-step commissioningofthecontrollerparametersusingEnglish languagepromptsandselections.The systemshall bean industrial hardenedoperator interfaceterminal.The terminal shall be enabledby thewebandallowremotemonitoringviaastandardinternetbrowserandsupportModbusTCP/IPMaster,TCP/IPSlave,RS-485ModbusMaster,andEthernetcommunications.12. High Torque Servo Features:• Easypushbuttonset-up,notrequiringtheadjustmentofinternal
• No servo feedback adjustments shall be required withpushbuttonzerosetup.Adjustabletravellimitswitchesshallbeintegral,withre-adjustmentnotrequiringnewfuelairratiocurvere-entry.
• Servos shall be cycledduringeach light-off cycle, and thefeedbackfromeachservomonitoredtoensuresafeactuatoroperation.