Omega LVCN-51 Series Owner's manual

Brand: Omega

Model: LVCN-51 Series

Category: Security access control systems

Type: Owner's manual

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INTRODUCTION/TABLEOFCONTENTS StepOne

The LVCN‐51 Series Continuous Relay Controller is a general‐purpose level controller which provides single

tank level indication with dual relays and a repeater 4‐20 mA output.The LVCN‐51 Series features both a

single 10A SPDT and a  single 10A Latching  SPDT relay.This package allows for a system that can perform

automaticoperations(fillorempty)andanalarmoperation(high or low).The LVCN‐51Seriescanalsobea

controller that can perform dual alarms (2‐high, 2‐low or 1‐high, 1‐low).Package the controller with a

transmitterthatprovidesa4‐20mAoutputandanenclosuretoprotectthecontrollerfromtheelements.

Features



3.5digitLEDdisplayindicateslevelincustomerengineeringunits.

 Fail‐Saferelaycontrolofpumps,valvesoralarmswitha0to60seconddelay.

 PolypropyleneenclosurecanbeDINrailmountedorbackpanelmounted.

 Easysetupwithpushbuttoncalibrationfordisplayandrela

ysettings.

 ACpowered

TableofContents

Specifications:.........................................................................................................................................................3

Dimensions:.............................................................................................................................................................3

SafetyPrecautions:.................................................................................................................................................4

MakeaFail‐SafeSystem:............................................................................................................................5

Components:...............................................................................................................................................5

Installation:............................................................................................................................................................5

GettingStarted:.......................................................................................................................................................6

FeaturesoftheSingleInputHighorLowAlarmRelay:..............................................................................6

 FeaturesoftheLatchingRelay(AutomaticFillorEmpty):.........................................................................6

 GuidetoControls:.......................................................................................................................................7

Electrical:.................................................................................................................................................................8

 WiringtoInputTerminals:.........................................................................................................................8

 SettingInputPolarity:.................................................................................................................................9

 RepeaterOutput:........................................................................................................................................9

 VACPowerInputWiring:.........................................................................................................................10

 Changingfrom120to240VAC:...............................................................................................................10

 RelayInputWiring:...............................................................................................................................

....10

ApplicationExmaples:...........................................................................................................................................11

 LowLevelAlarm:.......................................................................................................................................11

 HighLevelAlarm:......................................................................................................................................11

 AutomaticFill:...........................................................................................................................................12

 AutomaticEmpty:.....................................................................................................................................12

Programming:......................................................................................................................................................13

Appendix:..............................................................................................................................................................14

 ControllerLogic:........................................................................................................................................14

 RelayLatchingLogicTab

le:.......................................................................................................................14

 FactoryReset:...........................................................................................................................................14

 LockoutFunction:.....................................................................................................................................16

 Troubleshooting:.......................................................................................................................................15

Exercise:...............................................................................................................................................................16

SPECIFICATIONS/DIMENSIONS StepTwo

Displaytype: LED,3.5digit

Displayunits: Engineering

Displayoutput: 0to999or0.0to199.9

LEDindicators: Powerandrelaystatus

Bargraphdisplay: 4‐20mAwithsetpoints

Configuration: Pushbutton

Alarmindication: Amber:<4mA

 Red:>20mA

Security: Lockoutmode

Sensorinput: (1)4‐20mAtransmitter

Supplyvoltage: Selectable120VAC/240VAC

 50‐60Hz.

Consumption: 5Wattmaximum

Sensorsupply: 24VDC@1.5Watts

Looppower: 4‐20mA,18VDC

Contacttype: (1)SPDT

 (1)LatchedSPDT

Contactrating: 250VAC,10A

Contactoutput: Selectable,NOorNC

Contactlatch: ONorOFF

Contactconfiguration: 1:Highorlowlevelalarm

 2:Highandlowlevelalarm

 3:Automaticfillorempty

 4:Automaticfilloremptywithalarm

Contactdelay: 0‐60seconds

Failsafety: Powerfail‐safe

Repeateroutput: 4‐20mA,12‐36VDC

Ambienttemperature: F:‐40°to158°

 C:‐40°to70°

Enclosuretype: 35mmDIN(EN50022)

Enclosurematerial: Polypropylene

 (U.L.94VO)

CECompliance: EN50082‐2immunity

 EN55011emission

 EN61010‐1Safety



TopView‐AllModels

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SideView‐AllModels

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InternalControllerLogic

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SAFETYPRECAUTIONS StepThree

AboutThisManual:PLEASEREADTHEENTIREMANUALPRIORTOINSTALLINGORUSINGTHISPRODUCT.

ThismanualincludesinformationonthecontinuousrelaycontrollerfromOMEGAENGINEERING:LVCN‐51

series.

User’s Responsibility for Safety:OMEGAENGINEERING manufactures several models of controller,with

differentmountingandswitchingconfigurations.Itistheuser’sresponsibilitytoselectacontrollermodel

that is appropriate for the application, install it properly, perform tests of the installed system, and

maintainallcomponents.

Electrical Shock Hazard:It is possible to contact components on the controller that carry high voltage,

causing seriousinjury or death.All power to the controllerand the relay circuit(s) it controls should be

turned OFF prior to working on the controller.If it is necessary to make adjustments during powered

operation,useextremecautionanduseonlyinsulatedtools.Makingadjustmentstopoweredcontrollers

isnotrecommended.Wiringshouldbeperformedbyqualifiedpersonnelinaccordancewithallapplicable

national,stateandlocalelectricalcodes.

FlammableorExplosiveApplications:TheLVCN‐51Seriescontinuousrelaycontrollersshouldnotbeused

withexplosiveorflammableliquids,whichrequireanintrinsicallysafeorexplosionproofrating.Ifyouare

unsure of the suitability of a controller for your installation, consult your Omega Engineering

representativeforfurtherinformation.

InstallInaDryLocation:Thecontrollerhousingisnotdesignedtobeimmersed.Wheninstalledproperly,

itshouldbemountedinsuchawaythat it doesnot normallycomeintocontact with liquid.Refertoan

industryreferencetoensure thatcompoundsthatmaysplashontothecontrollerhousingwill notdamage

it.Suchdamageisnotcoveredbythewarranty.

RelayContactRating:Therelayisratedfora10ampresistiveload.Manyloads(suchasamotorduring

start‐uporincandescentlights)arereactiveandmayhaveaninrushcurrentcharacteristicthatmaybe10

to 20 times their steady‐state load rating.The use of a contact protection circuit may be necessary for

yourinstallationifthe10ampratingdoesnotprovideanamplemarginforsuchinrushcurrents.Incritical

applications,redundantbackupsystemsandalarmsmustbeusedinadditiontotheprimarysystem.Such

backupsystemsshouldusedifferentsensortechnologieswherepossible.

SAFETYPRECAUTIONS/INSTALLATION StepThree

Make a Fail‐Safe System:  Design a fail‐safe system that accommodates the possibility of relay or power

failure.If power is cut off to the controller, it will de‐energize the relay.Make sure that the de‐energized

stateoftherelayisthesafestateinyourprocess.Forexample,ifcontrollerpowerislost,apumpfillingatank

willturnoffifitisconnectedtotheNormallyOpensideoftherelay.

While the internal relay is reliable, over the course of time relay failure is possible in two modes: under a

heavyloadthecontactsmaybe“welded”orstuckintotheenergizedposition, orcorrosionmaybuildupona

contact so that it will not complete the circuit when it should.In critical applications, redundant backup

systems and alarms must be used in addition to the primary system.Such backup systems should use

differentsensortechnologieswherepossible.

While this manual offers some examples and suggestions to help explain the operation of OMEGA

ENGINEERINGproducts,suchexamplesareforinformationonlyandarenotintendedasacompleteguideto

installinganyspecificsystem.

Components:

 LVCN‐51 ‐Singleinputwithdualrelays,3.5digitLEDdisplayandrepeateroutput.

 LVCN‐51‐CE ‐Singleinputwithdualrelays,3.5digitLEDdisplayandrepeateroutputwithCEapproval.

 Owner’sManual



PanelDIN Rail Mounting:The controllermay bemountedby either a back panelusing two screws through

mountingholeslocatedatthecornersofthecontrollerorbysnappingthecontrolleron35mmDINRail.

 

Note:Alwaysinstallthecontrollerinalocationwhereitdoesnotcomeintocontactwithliquid.





 7

GETTINGSTARTED StepFour

FeaturesofaSingleInputHighorLowRelay:SingleInputRelays(Relay1orRelay2w/latchturnedOFF)are

designedtoswitchfromasingleset‐point.ItturnsitsinternalrelayONorOFF(assetbytheinvertswitch)in

responsetothepresenceofliquid,andchangestherelaystatusbackagainwhenthesensorisdry.

High Alarm:Invert is OFF.

Relay will energize when the

levelrisesabovethehighalarm

setting and will de‐energize

when it drops below the high

alarmsetting.

LowAlarm:InvertisON.Relay

will energize when the level

drops below the low alarm

setting and will de‐energize

when it rises above the low

alarmsetting.

Singleinputhighorlowrelaysmaybeusedwithanydevicethatoutputsa4‐20mAsignal.Therelayisasingle

pole, double throw type; the controlled device can be connected to either the normally open or normally

closedsideoftherelay.Atimedelayfrom0to60secondscanbesetbeforetherelayrespondstothesensor

input.Typicalapplicationsforsingleinputrelaysarehighlevelorlowlevelswitch/alarmoperations (opening

a drain valve whenever liquid level rises to a set‐point) and over‐flow protection (turning off a pump or

soundinganalarmwhenahighlevelisreached).

FeaturesofaLatchingRelay(automaticfillorempty):Thelatchingrelay(relay2only)isdesignedtoswitcha

relay on and off at two different levels.It turns its internal relay ON or OFF (as set by the invert switch) in

responsewhenthelevelisabovethehighsettingorbelowthelowsetting.Therelaywillnotchangeitsstate

whenthelevelisbetweenthehighandlowsetting.

AutomaticEmpty:

Latch is ON & Invert is OFF.Relay

will energize when level reaches

high setting (both settings are

submersed).Relaywillde‐energize

when level is below the bottom

setting(bothsettingsaredry).

AutomaticEmpty:

Latch is ON & Invert is ON.Relay

will energize when level is below

the bottom setting (both switches

are dry).Relay will de‐energize

when level is above the high

setting(bothsettingsarewet).



GETTINGSTARTED(continued) StepFour

The Latching Relay (Automatic Fill/Empty) may be used with any device that outputs a 4‐20 mA signal.The

relayisasingle pole,doublethrowtype;thecontrolleddevicecanbeconnectedtoeitherthenormallyopen

ornormallyclosedsideoftherelay.TypicalapplicationsforLatchingRelaysareautomaticfilling(startingfill

pump at a low level and stopping pump at a  high level) or automatic emptying operations (opening a drain

valveatahighlevelandclosingvalveatlowlevel).

GuidetoControls:Belowisalistingandthelocationofthedifferentcomponentsforthecontroller:



1. Powerindicator:ThisGreenLEDlightswhenACpowerisON.

2. Relay indicator:This Red LED will light whenever the controller energizes the relay, in response to the

transmitterinputandafterthetimedelay.

3. ACPowerterminals:Connectionof120VACpowertothecontroller.Thesettingmaybechangedto240

VAC if desired.This requires changing internal jumpers; this is covered in the Installation section of the

manual.Polarity(neutralandhot)doesnotmatter.

4. Relay terminals (NC, C, NO):Connect the device you wish to control (pump, alarm etc.) to these

terminals: supply to the COM terminal, and the device to the NO or NC terminal as required.The

switcheddeviceshouldbe anon‐inductiveloadof notmorethan10 amps;forreactiveloadsthecurrent

must be derated or protection circuits used.When the red LED is ON and the relay is in the energized

state,theNOterminalwillbeclosedandtheNCterminalwillbeopen.

5. Invertswitch:Thisswitchreversesthelogicoftherelaycontrolinresponsetotheswitch(es):conditions

thatusedtoenergizetherelaywillnowde‐energizetherelayandviceversa.

6. Timedelay:Setsdelayfrom0to60

seconds.HoldDelaybuttontoincreasedelayin5secondincrements.

7. Digitaldisplay:Showsthecurrent4‐20mAsignalinengineeringunits.

8. Input terminals:Connect the transmitter wires to these terminals:A 24 VDC power is provided for

currentloopwithanadditional28VDCpowerterminalifrequired.

9. Latchswitch(relay2):Thisswitchdetermineshowtherelaywillbeenergizedinresponsetothetwoset

points.WhenLATCHisOFF,therelayrespondstosetpointRLY2Aonly;whenLATCHisON,therelaywill

energiz

eorde‐energizeonlywhenbothsetpoints(RLY2AandRLY2B)areinthesamecondition(bothwet

orbothdry).Therelaywillremainlatcheduntilbothsetpointschangeconditions.

10. BarGraph:Displays4‐20mAsignalasapercentageoftherange.

11. OP/SET:Usedtoscrollbetweensetpointsdurin

gprogramming.

12. 20/Down:UsedtodecreasedisplayvalueduringprogrammingandforEasyCal™Spansetup.

13. 4/Up:UsedtoincreasedisplayvalueduringprogrammingandforEasyCal™Offsetsetup.

14. RepeaterOutput:Isolatedterminalwhichreproducestheinput 4‐20mAsignal.Terminalrequires12

‐36

VDCpowerforoperation.



 9

ELECTRICAL StepFive

WiringtoInputTerminals:Signalinputisalwaysthroughthe24VDCterminal.The28VDC

terminal is used as an alternative power supply for three‐wire devices.Please note a

difference between 2‐wire and 3‐wire level transmitters and sourcing and sinking modes

below.Below is a quick review of wiring the LVCN‐51 Series to common 4‐20 mA

transmitters.



LVCN‐2700Series(LVU2710,LUV2718,LVU2726&

LVU2732)&LVCN414Series(LVCN414,LNCV414‐

I,LVCN210&LVCN318)

Sourcingmode(FactorySetting)

LVU800Series(LVU809,LVU816,LVU826&

LVU832)

SourcingMode(FactorySetting)



LVU‐300Series(LVU‐301only)

SourcingMode(FactorySetting)

LVU‐300Series(LVU‐303only)

Sinkingmode(internaljumpermustbechanged)



UltrasonicLevelTransmitter(IntrinsicallySafe)(LVU‐201Aonly)

Sinkingmode(internaljumpermustbechanged)





ELECTRICAL(continued) StepFive

Setting Input Polarity (Sourcing vs. Sinking modes):The LVCN‐51 Series can be set in one of two modes,

sourcingandsinking.TheLVCN‐51Seriesisshippedfromthefactoryinthesourcingmode.Thisiscompa tible

withanylooppoweredtransmittersuchastheLVCN‐2700Series(LVU2710,LUV2718,LVU2726&LVU2732),

LVU800 Series (LVU809, LVU816, LVU826 & LVU832), LVCN414 Series (LVCN414, LNCV414‐I, LVCN210 &

LVCN318)andthethree‐wireUltrasonicLVU‐300Series(LVU‐301only)withnoadjustmentrequired.Ifusing

aLVU‐300Series(LVU‐303only)orUltrasonic Level Transmitter (Intrinsically Safe)(LVU‐201Aonly),follow

theinstructionsbelow.

1. Removethebackpanelofthecontrollerandgentlyslidetheprinted

circuit

board(PCB)fromthehousing.UsecautionwhenremovingthePCB.

2. LocatejumpersJWAandJWBonthePCB.

3. Tochangefromsourcingtosinking,removejumperfromJWAandplaceon

JWB.TheLVCN‐51

Seriesisshippedfromthefactoryinthesourcingmode

(JWAactive).

4. GentlyreturnPCBintohousingandreplacebackpanel.

Note:Looppowereddevicescanoperateineitherthesouringorsinkingmodes.

SourcingMode

SinkingMode



NoChange

Required

LVCN‐2700Series(LVU2710,LUV2718,LVU2726&LVU2732),LVU800

Series(LVU809,LVU816,LVU826&LVU832),LVCN414Series

(LVCN414,LNCV414‐I,LVCN210&LVCN318)andthethree‐wire

UltrasonicLVU‐300Series(LVU‐301only)

Sinkingor

Loop

Devices

Change

Required

LVU‐300Series(LVU‐303only)or

UltrasonicLevelTransmitter(IntrinsicallySafe)(LVU‐201Aonly)

Sourcing

Devices



RepeaterOutput:Theisolatedrepeateroutputreproducesthe

input4‐20mAcurrentsignal.Thissignalcanberepeatedtoany

other device that accepts a 4‐20 mA input, such as a PLC, DCS,

SCADA, chart recorder or another display.The repeated 4‐20

mAsignalisnotanexcitedoutput.Anexternalpowersupplyis

required and should not exceed a maximum of 36 VDC.See

the wiring diagram to the right for instructions in wiri ng all

threecomponents(repeateroutput,powersupplyandthenew

device)inserieswitheachother.





 11

ELECTRICAL(continued) StepFive

VACPowerInputWiri ng:ObservethePOWERSUPPLYlabel on the LVCN‐51Series. Thelabel identifies the

power requirement (120 or 240 VAC) and the terminal wiring.Note: Polarity does not matter with the AC

inputterminal.



Changing from 120 to 240 VAC:The LVCN‐51 Series is shipped from the factory configured as a 120 VAC

powereddevice.

Toswitchto240VAC,followtheinstructionsbelow.

1. Remove the back panel of the controller and gently  slide the printed

circuitboard (PCB)fromthehousing.Usecautionwhen removing the

PCB.

2. LocatejumpersJWAandJWBonthePCB.

3. To change from sourcing to sinking,  remove jumper from

 JWA and

place on JWB.The LVCN‐51 SERIES is shipped fromthe factory in the

sourcingmode(JWAactive).

4. GentlyreturnPCBintohousingandreplacebackpanel.

120VACJumperSetting

240VACJumperSetting



RelayInputWiring:Therelayisasinglepole,double

throwtyperatedat250VoltsAC,10Amps.Thetwo

terminal NO and NC (normally open and normally

closed) will be used in different applications. 

Remember that the "normal" state  is when the relay

coilisde‐energizedandtheRedre

layLEDisOff/de‐

energized.





APPLICATIONEXAMPLES StepSeven

LowLevelAlarm:Thegoalistomakesurethattheliquidleveldoesnotfallbelowacertainpoint.Ifitdoes,

analarmissupposedtosound,alertingtheoperatorofalowlevelcondition.

Ifpowerisaccidentallycuttothecontroller,thesensor'sabilitytonotifytheoperatorofalowlevelcondition

couldbelost.Thesystemmustalerttheoperatornotonlytolowliquidlevel,buttocontrollerpowerloss.

To do this, connect the hot lead of the alarm to the NC side of the relay

terminalofthecontroller.Ifpowerislost,therelaywillbede‐energized,and

the alarm will sound (if there is still power to the alarm circuit itself).The

alarm circuit should have a non‐interruptible power supply or some other

indicatororbackupalarmtowarnofapowerfailureinthealarmcircuit.

In this application, the normal status of the sensor at the bottom if the tank

will be wet, and the relay will  be energized holding the alarm circuit open.

Both the relay LED and the Input LED will  be on simultaneously,  so for this

application,InvertshouldbesettotheOFFposition.

HighLevelAlarm:Inthesamemanor,thissystemcanbeusedtosoundanalarmwhenfluidreachesahigh

level, with just a change  in the location of the sensor and the setting of the

Invertswitch.

The alarm is still connected to the  NC side of the relay to allow  for a power

failurealarm.

The sensor is normally dry.In this condition, we want the relay to be

energized so the alarm does not sound: i.e., the Red relay LED should be on

whenevertheInputLEDisAmber.SoweturnInvertOn.Ifthefluidlevelrises

tothehigh sensor point, thesensorgoeson,therelayde‐energizes,and the

alarmsounds.





 13

APPLICATIONEXAMPLES(cont.) StepSeven

Automatic Fill:This system consists of a tank with a valve controller by the

LVCN‐51 Series.At a low set point, the valve opens, filling the tank.At the

high set point, the valve closes.Part of a proper fail‐safe design for this

particularsystemis that if powerislost to thecontroller for any reason,the

valvefillingthe tank must close.Therefore, we connect the valvetotheNO

sideoftherelay.Whentherelayisenergized,thevalvewillopenandfillthe

tank.TherelayindicatorwillcorresponddirectlytotheOpen/Closestatusof

thevalve.

NOTE: If the  device’s load exceeds the rating of the controller’s relay, a

stepperrelayofhighercapacitymustbeusedaspartofthesystemdesign.

DeterminingthesettingsofLATCHandINVERT:Thisisthewaythesystemmustoperate:

 Whentheliquidlevelisbelowthelowsetpoint,thevalveshouldopen,startingtofillthetank.

 Whentheliquidisabovethelowsetpoint,thevalvewillremainopen.

 Whentheliquidreachesthehighsetpoint,thevalveshouldclose.

Latch:Inanytwo‐sensorcontrolsystem,LATCHmustbeON.

Invert:ReferringtothelogicchartinStepNine,welookforthesettingthatwillde‐energizetherelay(valve

close)whenbothinputsarewet.Inthissystem,InvertshouldbeON.

AutomaticEmpty:Inthesamemanner,thecontrollercanbeusedtoautomaticallyemptyatankwithjusta

changetothesettingoftheINVERTswitch:

• ThevalveisstillconnectedtotheNOsideoftherelaytoallowforapowerfailurefail‐safecondition.

• Thenormalstateofthevalveisclosed.Inthisstate,wewanttherelaytobeenergizedatthehighset

point(openingvalvetodraintank).Therelaywillde‐energizeatthelowsetpoint(closingvalve).

Note:Afail‐safedesignisimportant.Ifthetankisbeingpassivelyfilled,andavalvemustbe usedtoactively

emptyit,apowerfailuretoeitherthecontrollerorthepumpcircuitswillcauseoverflow.





PROGRAMMING StepEight

OFFSET:Equivalenttothe4mAsetpointonthetransmitter.Enterthevalueyouwouldliketoseewhenthe

LVCN‐51Seriesreceives4mA.

SPAN:Equivalenttothe20mAsetpointonthetransmitter.Enterthevalueyouwouldliketoseewhenthe

LVCN‐51Seriesreceives20mA.

RLY1,RLY2A,RLY2B:Setpoints

forRelays.ValuesmustbebetweenOFFSETandSPAN.

Settingvalues:WiththeLatchOff,ignoresteps9and10.RLY2Bwillnotshowduringtheprogramming

sectionwithLatchOff.

1. PresstheSETbuttononce.Immediately,theLEDbargraphwillbegintoflashone

Greenbarnex

ttoOFFSET.

2. UseUP/DWNbuttonstochangedisplaytothedesiredOFFSETvalue.



3. PresstheSETbuttonagain.Immediately,theLEDbargraphwilljumponeGreenbarto

therightnexttoSPAN.

4. UseUP/DWNbuttonstochangedisplaytothedesiredSPANvalue.



5. PresstheSETbuttonagain.Immediately,theLEDbargraphwilljumponeGreenbarto

therightnexttoRLY1.

6. UseUP/DWNbuttonstochangedisplaytothedesiredRLY1value.



7. PresstheSETbuttonagain.Immediately,theLEDbargraphwilljumponeGreenbarto

therightnexttoRLY2A.

8. UseUP/DWNbuttonstochangedisplaytothedesiredRLY2Avalue.



9. PresstheSETbuttonagain.Immediately,theLEDbargraphwilljumponeGreenbarto

therightnexttoRLY2B.

10. UseUP/DWNbuttonstochangedisplaytothedesiredRLY2Bvalue.



11. PresstheSETbuttonagain.Immediately,theLEDbargraphwillreturnbacktoit

normaloperationofsolidbars.



EasyCalCalibration:TheOffsetandSpanpoints may be programmed directlytoaspecificleve

linthetank.

These are the EasyCal 4 (Empty tank) and EasyCal 20 (Full tank) values.Note: the level of the tank must

physicallybeatitsdesiredlevelwhenusingEasyCal.Ifnot,theEasyCalwillacceptthelevelandthevalueson

thedisplaywillbeincorrect.Usethefactoryresettostartoverifthisoccurs.

To calibrate EC4, set the tank to the new Offset level.Press [4]

buttononceand[E]willappearinthedisplay.Press[4]buttonagain

and[C]willappearinthedisplayandEC4isset.



To calibrate EC20, set the tank to the new Span level. Pr

ess [20]

buttononceand[E]willappearinthedisplay.Press[20]buttonagain

and[C]willappearinthedisplayandEC20isset.



 15

APPENDIX StepNine

ControllerLogic:Pleaseusethefollowingguidetounderstandtheoperationofthecontrollers.

1. PowerLED:MakesuretheGreenpowerLEDisONwhenpowerissuppliedtothecontroller.

2. BarGraphLED:ThebargraphLEDonthecontrollerwillalwaysindicate the proportional 4‐20mAinput

signalgoingtotheLVCN‐51Seriescontroller.i.e.:ifthetankis25%full,then25%ofthebargraphwill be

litGreen.IfasingleAmberbarappears,thisindicatesaninputcurrentoflessthan4mA.IfasingleRed

LED appears, this indicates an input current greater than 20 mA.Use this feature to confirm the input

signalfortheLVCN‐51Series.

3. RelayLEDs:Thenormalstateofthe relayiswhentheLEDisOFF.Whentherelaybecomesenergized,the

RedLEDwilllight.Ifpowerisremovedfromthecontroller,therelaywillreturntothenormalstate(LED

OFF).

4. Display:Willindicatetheproportionalleveloftheliquidbaseduponthe4‐20mAinput.IfEasyCalisused

foreithertheemptytanklevel,fulltanklevelorboth,thedisplaywillignorethe4‐20mAinputsignaland

usetheEasyCalsettingasitsemptyand/orfullposition.

RelayLatchLogicTable(relay2only):

Therelaycaneitherbeanindependentrelay(highorlowlevelalarm)

orcanbealatchingrelay(automaticfillorempty)withlatchON.WithLatchOFF,therelaywillonlyrespond

totheRLY2Asetting.RLY2Bwillbeignored.

WithLatchOFF,thesettingforRLY

2Bwill be ignored.

Allchanges to

the relay’s state will occur from

theRLY2Asetting.

InvertOFF LatchOFF

RLY2A RLY2B Relay

ON

OFF

NoEffect

NoEffect

ON

OFF



InvertON LatchOFF

RLY2A RLY2B Relay

ON

OFF

NoEffect

NoEffect

OFF

ON



With Latch ON, the relay will

actuate when the level is above

RLY2AandRLY2B.Therelaywill

not change its condition if the

level is between RLY 2A and RLY

2B.Therelaywillreverseitsstate

when the level is below both RLY

2AandRLY2Bsettings.

InvertOFF LatchON

RLY2A RLY2B Relay

ON

OFF

ON

OFF

ON

OFF

ON

NoChange

OFF



InvertON LatchON

RLY2A RLY2B Relay

ON

OFF

ON

OFF

ON

OFF

NoChange

ON



Factory Reset:Returns the LVCN‐51 Series to its original factory settings,

includingsettingtheOFFSET to 4 mA and theSPANto20mA.Toperforma

FactoryReset,firstremovepowertothecontroller.Holdboththe4/UPand

20/DWN buttons while adding power to the LVCN‐51 Series.An “F” for

Factory Reset will appear in the display indication the Factory Reset was

achieved.If an “E” for Error appears, the Factory Reset was not performed

and you will need to try again.Note: make sure both buttons are pressed

whileaddingpower.The“E”willappearifonlyoneofthebuttonsispressed.



Factory

SettingsforLVCN‐51Series

OFFSET SPAN RLY1 RLY2A RLY2B

4.0 20.0 6.0 18.0 8.0



APPENDIX(continued) StepNine

LockOutFunction:ThebuttonsonthefaceoftheLVCN‐51Seriescanbedisengagedorlockedout.To

lockoutthebuttons,pressbothdelaybuttonsandtheDWNbuttonsimultaneously(seebelowleft).Thiswill

lockoutallofthebuttonsandpreventanaccidentalchangingofsettings.Tounlockthebuttons,pressboth

delaybuttonsandtheUPbuttonsimultaneously(seebelowright).

LockOutON

(LOCKED)

LockOutOFF

(UNLOCKED)



Troubleshooting

PROBLEM SOLUTION

Displayisnotreading

correctlevel.

First check the Bar Graph to make sure it is indicating

the correct level.If not, check transmitter.If so,

performafactoryresetontheLVCN‐51Seriesandreset

values.

BarGraphisnotindicating

thecorrectlevel.

Checkthetransmitter’s4‐20mAoutputmakingsureitis

spannedcorrectlyfortheapplication.

BarGraphshowsasingle

Amberbar.

This indicates acurrentinput less than 4mA.Checkfor

looseoropenwiresbetweenthetransmitterandLVCN‐

51Seriesandchecktheoutputofthetransmitter.

BarGraphshowsasingle

Redbar.

This indicates a current input greater than 20mA.

Remove power immediately.Check for a short in the

wiring between the transmitter and LVCN‐51 Series or

for some other power source that is affecting the input

loop.

RLY2Bdoesnotappear. FlipLatchswitchtoON.

Relayswitchesonlyfrom

RLY2A(ignoresRLY2B).

LatchisturnedOFF.FlipthelatchswitchtoturnON.

LevelreachesalarmON,

butrelayisOFF.

First, check to make sure the input LED is ON.If not,

checkwiringtosensor.

Second, check status of Relay LED.If incorrect, flip the

Invertswitchtochangetherelaystate.

PumporValveissupposed

tostop,butitdoesnot.

First,checktomakesurethebar graphisindicatingthe

correct level.Next check the relay settings. Finally,

check status of Relay LED.If incorrect, flip the Invert

switchtochangetherelaystate.

Controllerispowered,but

nothinghappens.

First check the Power LED to make sure it is Green.If

not,checkthewiring,powerandmakesuretheterminal

isseatedcorrectly.



 17



EXERCISE StepTen

The following exercise demonstrates inventory

control with automatic filling and a high level alarm.

The usable range  is 60 inches of liquid.The pump

starts filling at 10 inches of liquid and stops filling  at

50 inches of liquid.A high level alarm occurs at 55

inchesofliquid.

EnterallvaluesintotheLVCN‐51Seriesininches.The

OFFSET is the corresponding 4 mA setting in inches.

The SPAN is the corresponding 20mA setting in

inches.RLY2AandRLY2Bisdedicatedtothefillingof

the tank because RELAY2 is a latching relay.RLY1 is

dedicatedtothehighlevelalarmbecauseitisasingle

set point relay.

Use the following values for

programmingtheLVCN‐51Series.



OFFSET

0.0

SPAN

60.0

RLY1

55.0

RLY2A

50.0

RLY2B

10.0



The next exercise demonstrates the same inventory

control with automatic filling and a high level alarm.

However,theunitshavebeenchangesfrominchesto

gallons.Within the tank, 1” = 50 gallons of liquid. 

The usable range is now 300 gallons of liquid.The

pump starts filling at 50 gallons of liquid and stops

filling at 250 gallons of liquid.A high level alarm

occursat275gallonsofliquid.

Enter all values into the LVCN‐51 Series in gallons.

The OFFSET is the corr esponding 4 mA setting in

gallons.TheSPANisthecorresponding20mAsetting

ingallons.RLY2AandRLY2Bisdedicatedtothefilling

ofthetankbecauseRELAY2isalatchingrelay.

RLY1is

dedicatedtothehighlevelalarmbecauseitisasingle

set point relay.Use the following values for

programmingtheLVCN‐51Series.



OFFSET

0

SPAN

300

RLY1

275

RLY2A

250

RLY2B

50





EXERCISE(continued) StepTen

The following exercise demonstrates inventory

control with a high and low level alarm.The usable

rangeisbetween16and56inchesofliquid.Thehigh

level alarm occurs at 50 inches of liquid and the low

levelalarmoccursat20"ofliquid.

EnterallvaluesintotheLVCN‐51Seriesininches.The

OFFSET is the corresponding 4mA setting in inches.

The SPAN is the corresponding 20mA setting in

inches.RLY1 is dedicated to the high level alarm

because it is a single set point relay.RLY2A is

dedicated to the low level alarm because the latch is

turned off on Relay 2.Use the  following valu

es for

programmingtheLVCN‐51Series.



OFFSET

0.0

SPAN

65.0

RLY1

50.0

RLY2A

20.0

RLY2B

N/A



The next exercise demonstrates the same inventory

controlwitha highandlowlevelalarm.However,the

units have been changes from inches to gallons.

Alongthe  straight sideofthetank,1”=50gallonsof

liquid.The usable range is now from 50 to 250

gallons of liquid.The high level alarm occurs at 220

gallons of liquid.The low level alarm occurs at 70

gallonsofliquid.

EnterallvaluesintotheLVCN‐51Seriesingallons.

TheOFFSETisthecorresponding4mAsettingin

gallons.TheSPANisthecorresponding20mAsetting

ingallons.RLY1isdedicatedtothehighlevelalarm



becauseitisasinglesetpointrelay.RLY2Ais

dedicatedtothelowlevelalarmbecausethelatchis

turnedoffonRelay2.Usethefollowingvaluesfor

programmingtheLC52‐1001.



OFFSET

0

SPAN

250

RLY1

220

RLY2A

70

RLY2B

N/A





 19



Omega LVCN-51 Series Owner's manual

Brand: Omega

Model: LVCN-51 Series

Category: Security access control systems

Type: Owner's manual

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Omega LVCN-51 Series Owner's manual

Omega LVCN-51 Series Owner's manual

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