Omega LVCN-120, -130, and -140 Series Owner's manual

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

The LVCN‐120/‐130/‐140 Series Controllers are general‐purpose level controllers offered in three

configurationsforpumpandvalvecontrol.TheLVCN‐140Seriesfeaturesasingle10ASPDTrelayoutputand

canacceptonelevelsensorasaninput.TheLVCN‐130Seriesfeaturesasingle10ASPDTlatching relayoutput

and can accept one or two level sensor(s) as an input.This package is ideal for the automatic filling or

emptying of a tank.The LVCN‐120 Series features both a single 10A SPDT and a single 10A Latching SPDT

relay.This package allows for a three‐input

system that can perform aautomatic operations (fill or empty)

and an alarm operation (high or low).The LVCN‐120 series can also be a two‐input controller that can

performdualalarms(2‐high,2‐lowor1‐high,1‐low).Packageeithercontrollerserieswithlevelswitchsensors

and

fittings.

Features

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

 Optionalflashingalarmbringsimmediateattentiontolevelalarmconditions.

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

 EasysetupwithLEDindicatorsforsensor(s),powerandrelaystatus.

 InvertswitchchangesrelaystatefromNOtoNCwithoutrewiring.

 ACpowered

TableofContents

Specifications:.........................................................................................................................................................4

Dimensions:.............................................................................................................................................................4

SafetyPrecautions:.................................................................................................................................................5

MakeaFail‐SafeSystem:............................................................................................................................6

Components:...............................................................................................................................................6

GettingStarted:.......................................................................................................................................................7

FeaturesoftheSingleInputHighorLowRelay:.........................................................................................7

 FeaturesoftheDualInputAutomaticFill/EmptyRelay:............................................................................7

 GuidetoControls:.......................................................................................................................................8

Electrical..................................................................................................................................................................9

 ConnectingSwitchestoInputTerminals:...................................................................................................9

 VACPowerInputWiring:............................................................................................................................9

 RelayInputWiring:...................................................................................................................................10

 Changing

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

Installation............................................................................................................................................................11

ApplicationExmaples............................................................................................................................................12

 LowLevelAlarm:.......................................................................................................................................12

 HighLevelAlarm:......................................................................................................................................12

 LEDIndication:..........................................................................................................................................12

 AutomaticFill:...........................................................................................................................................13

 AutomaticEmpty:.....................................................................................................................................13

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

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

 RelayLatchingLogicTable(LVCN‐120&‐130Seriesonly).......................................................................14

 Troubleshooting........................................................................................................................................14

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SPECIFICATIONS/DIMENSIONS StepTwo

Supplyvoltage: 120/240VAC,50‐60Hz.

Consumption: 5Wattsmax.

Sensorinputs: (1)levelswitch

(LVCN‐130seriesonly) (1or2)levelswitches

(LVCN‐120seriesonly) (1,2or3)levelswitches

Sensorsupply: 13.5VDC@27mA

LEDindication: Sensor,relay&powerstatus

Contacttype: (1)SPDTRelay

(LVCN‐130seriesonly) (1)SPDTRelay,Latched

(LVCN‐120seriesonly) (2)SPDTRelays,only1Latched

Contactrating: 250VAC,10A

Contactoutput: SelectableNOorNC

Contactdelay: 0to60seconds

Contactlatch: SelectOn/Off

 (LVCN‐120&LVCN‐130seriesonly)

Electronicstemp.: F:‐40°to158°

 C:‐40°to70°

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

Enclosurematerial: PP(U.L.94VO)

Failsafety: Powerfail‐safe

CEcompliance: EN61326EMC

 EN61010‐1Safety

LVCN‐140seriesfaceplate:1sensorinput,1relayoutput.

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LVCN‐130series

faceplate:2sensorinputs,1relayoutput.

Therelayincludedisalatchingrelay.

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LVCN‐120seriesfaceplate:3sensorinput,2relayoutputs.

Onerelayislatchingandtheotherisasingleinputrelay.

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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INST ALLINGORUSINGTHISPRODUCT.

This manual includes information on three different models of Remote Relay Controllers from OMEGA

ENGINEERING:LVCN‐120,LVCN‐130andLVCN‐140series.Manyaspectsofinstallationandusearesimilar

betweenthethreemodels.Wheretheydiffer,themanualwillnoteit.Pleaserefertothepartnumberon

thecontrolleryouhavepurchasedasyouread.

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entireLVCN‐120/‐130/‐140seriesremotemount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,

the controller is not designed to be immersed.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.

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SAFETYPRECAUTIONS(cont.) 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‐140 ‐SingleInputHighorLowRelayController

 LVCN‐140‐CE ‐SingleInputHighorLowRelayControllerw/CE

 LVCN‐130 ‐DualInputAutomaticFill/EmptyRelayController

 LVCN‐130‐CE ‐DualInputAutomaticFill/EmptyRelayControllerw/CE

 LVCN‐120‐ThreeInputAutoFill/EmptyRelayControllerwithSingleInputHighorLowRelay

 LVCN‐120‐CE‐ThreeInputAutoFill/EmptyRelayControllerwithSingleInputHighorLowRelayw/CE

 Owner’sManual

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 7

GETTINGSTARTED StepFour

FeaturesofaSingleInputHighorLowRelay:SingleInputRelays(LVCN‐140series,LVCN‐130serieswithlatch

turned OFF and LVCN‐120 series) are designed to receive a signal from a single liquid sensor.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 switch

becomes Wet and will de‐

energize when the switch

becomesDry(outofliquid).

LowAlarm:

InvertisON.Relay

willenergize

when the switch becomes Dry

(out of liquid) and will de‐

energize when the switch

becomesWet.

SingleInputRelaysmaybeusedwithalmostanykindofsensorsignal:currentsensingorcontactclosure.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sensorpoint)andleakdetection(sounding

analarmwhenaleakisdetected,etc.).

FeaturesofaDualInputAutomatic  Fill/EmptyRelay:TheDualInputAutomaticFill/EmptyRelay(LVCN‐120

andLVCN‐130seriesonly)isdesignedtoreceivesignalsfromtwoliquidsensors.ItturnsitsinternalrelayON

or OFF (as set by the invert switch) in response to the presence of liquid on bothsensors, and changes the

relaystatusbackagainwhenbothsensorsaredry.

AutomaticEmpty:

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

will energize when level reaches

high switch (both switches are

wet).Relay will de‐energize when

level is below the bottom switch

(bothswitchesaredry).

AutomaticEmpty:

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

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

the bottom switch (both switches

are dry).Relay will de‐energize

when level reaches

 high switch

(bothswitchesarewet).



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

TheDualInputAutomaticFill/EmptyRelaymaybeusedwithalmostanykindofsensorsignal:currentsensing

orcontactclosure.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DualInput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

properconditionatthesensorinput(s)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):Conne ct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. Time delay: Use

 potentiometer  to set delay from 0.15 to 60 seconds.Delay occurs during switch make

andswitchbreak.

6. Inputindicators:UsetheseLEDsforindicatingWETorDRYstatusofswitch.WhenswitchisWET,LEDwill

beAmber.WhenswitchisDRY,LEDwilleitherbeGreenforpoweredswitchesorOFFforreedswitches.

Note:PoweredswitchesmaybereversedforWET/OFF,DRY/Amberindication.

7. 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.

8. Latch

 switch (LVCN‐120 and LVCN‐130 series only):This switch determines how the relay will be

energizedinresponsetothetwosensorinputs.WhenLATCHisOFF,therelayrespondstosensorInputA

only;whenLATCH is ON, the relay will energizeorde‐energizeonly when both switches(AandB)arein

the same condition (both wet or both dry).The relay will remain latched until both switches change

conditions.

9. Inputterminals:Connecttheswitchwirestotheseterminals:Notethepolarity:(+)isa13.5VDC,27mA

powersupply(connected totheredwire

ofaOMEGAENGINEERINGlevelswitch),and(‐)isthereturnpath

from the sensor (connected to the black wire of a OMEGA ENGINEERING level switch).If polarity is

reversed,thesensorswillnotwork.



 9

ELECTRICAL StepFive

Connecting switches to input terminals:Please note a

difference between OMEGA ENGINEERING powered level

switchesandreed switches.All poweredlevelswitches (series

LTU‐100, LVU‐150, LVP‐51, LVC‐152 & LVF‐210 series) will be

wired with the Red wire to the (+)terminal and the Blackwire

the(‐)terminal.OMEGAENGINEERINGreedswitches(series

LVV‐110 & LVH‐200 series) will have a particular wiring based

uponpartnumber.Seetheillustrationbelowtoindicatewiring

foryourswitch.Note:theShieldwirewillbeusedonlyforlong

cablerunsorwhereexcessiveelectricalnoiseispresent.



* LVV‐110 series can be wired using the

White andBlack wires for NO operations

or the Red and Black wires for NC

operations.



LED Indication:Use LED's located above the input

terminalstoindicatewhethertheswitchisinawetor

dry state.

With powered switches, Green indicates

dry and Amber indicates wet.With reed switches,

AmberindicateswetandnoLEDindicatesdry.Note:

reed switches may be wired in reverse so that wet

indicatesdryandAmberindicatesdry.



PoweredSwitches ReedSwitches

VAC Power Input Wiring:Observe the POWER SUPPLY label on the LVCN‐120/‐130/‐140 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.



ELECTRICAL(continued) StepFive

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

throw type rated at 250 Volts AC, 10 Amps, 1/4 Hp.

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relayLEDisOff/de‐

energized.



Changingfrom120to240VAC:

1. Remove the back panel of the controller and

gently slide the printed circuit board from the

housing.UsecautionwhenremovingthePCB.

2. LocatedjumpersJW1,JW2andJW3onthePCB.

3. Tochangeto240VAC,removejumpersfromJW1

andJW2andplaceasinglejumperacrossJW3.To

changeto120VAC,removejumperJW3andplace

jumpersacrossJW1andJW2.

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

panel.



 120VAC 240VAC

 Configuration Configuration





 11

INSTALLATION StepSix

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.







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 if 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.

LEDIndication:Todeterminewhethertheswitchisinawetordrystate,observetheLED'sloc a tedabovethe

inputterminals.Withpoweredswitches,GreenindicatesdryandAmber

indicateswet.Withreedswitches,

Amber indicates wet and no LED indicates dry.Note: reed switches maybe wired in reverse so that wet

indicatesdryandAmberindicatesdry.





 13

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

AutomaticFill:This systemconsistsofatank withahighlevelsensor,alow

levelsensor,andapumpthatiscontrolledbythecontroller.Partofaproper

fail‐safe design for this particular system is that if power is lost to the

controller for any reason, the pump filling the tank must be turned off.

Therefore,weconnectthepumptotheNOsideoftherelay.Whentherelay

isenergized,thepumpwillturnonand fill  the tank.The relay indicatorwill

corresponddirectlytotheON/OFFstatusofthepump.

NOTE:Ifthepump motor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boththehighandlowsensorsaredry,thepumpshouldturnon,startingtofillthetank.

 Whenthelowsensorgetswet,thepumpshouldstayon.

 Whenthehighsensorgetswet,thepumpshouldturnoff.

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(start

thepump)whenbothinputsarewet(AmberLEDs).Inthissystem,InvertshouldbeON.

DeterminingAorBinputconnections:WhenLATCHisON,thereisnoeffectivedifferencebetweenInputA

andB,sincebothsensorsmusthavethesamesignalinorderforstatustochange.Whenwiringanytwo‐input

relaysection,theonlyconsiderationforhookingaparticularsensortoAorBisifLATCHwillbeOFF.

Automatic Empty:Note that similar system logic can be used for an

automaticemptyoperationsimplybycontrollinga pumpthatpumpsfluidout

of the tank instead of into it.However, note the importance of fail‐safe

design.If the tank is being passively filled, and a pump must be used to

activelyemptyit,apowerfailuretoeitherthecontrollerorthepumpcircuits

willcauseoverflow.

Alternatively,anelectrically‐controlleddrainvalvecouldbeused.Inthiscase,

the valve should be a type that will automatically open if power is lost; in

other words, power must be used to hold it closed.The valve would be

connectedto

theNOsideofthe relay—ifpowerislosttothecontroller,therelayde‐energizes,thevalveloses

thepowerthatwasholdingitshut,andfluidwilldrainfromthetankintosomeothersafecontainmentuntil

power is restored. In this system, whenever the red relay LED of the controller is ON, the drain is closed,

allowingfluidtorise.

Inthiscase,InvertshouldbeON:whenbothsensorsarewet,therelayde‐energizes,theswitchtothevalve

opens,andthetankwilldrain. 

APPENDIX StepEight

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. InputLED(s):TheinputLED(s)onthecontrollerwillbeAmberwhentheswitch(es)is/arewetandGreen

orOFFwhentheswitch(es)is/aredry.IftheLED'sarenotswitchingtheinputLED,testthelevelswitch.

3. Single‐InputRelays:WhentheinputLEDturnOFFandON,therelayLEDwillalsoswitch.WithinvertOFF, 

therelayLEDwillbeONwhentheinputLEDisONandOFFwhentheinputLEDisOFF.WithinvertON,the

relayLEDwillbeOFFwhentheinputLEDisONandONwhentheinputLEDisOFF.

4. Dual‐Input (latching) Relays:When both inputs are wet (Amber LED's ON), the relay will be energized

(Red LED ON).After that, if one switch becomes dry, the relay will remain energized.Only when both

switches are dry (both amber LED's OFF) will the controller de‐energize the relay.The relay will not

energizeagainuntilbothswitchesarewet.SeetheRelayLatchLogicChartbelowforfurtherexplanation.

RelayLatchLogicTable(latchingrelays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INPUTAsetting.INPUTBwillbeignored.

With Latch ON, the relay will

actuate when INPUT A and INPUT

B are in the same condition.The

relay will  not change its condition

until both inputs reverse their

state.

Caution:Some sensors

(particularly buoyancy sensors)

may have their own inverting

capability (wired NO or NC).This

will change the logic of the invert

switch.Checkyoursystemdesign.

Troubleshooting

PROBLEM SOLUTION

Relayswitchesonlyfrom

inputA(ignoresinputB)

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inputLEDsarebothinthe

satestate(bothONorbothOFF).Ifnot,checkwiringto

sensoreachsensor.

Second, 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overthe6‐pins.

 15





Omega LVCN-120, -130, and -140 Series Owner's manual

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