Omega LVCN-131 and LVCN-141 Owner's manual

Brand: Omega

Model: LVCN-131 and LVCN-141

Type: Owner's manual

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

The general‐purpose flow controller is offered in two configurations for low‐flow pump and process

protection.The LVCN‐141 Series accepts one flow sensor input and provides one 10A relay for low flow

control.The LVCN‐131Seriesacceptstwo flowsensorinputs and providestwo 10Arelays fordual lowflow

control.Packagethis flow controller withourliquidor gas flow switch sensors.Forfield mount installation,

addasingleordualcontrollerNEMAbox.

Features

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

 EasysetupwithLEDindicatorsforsensor(s),powerandrel

aystatus.

 35mmDINrailmountpolypropyleneenclosurewithremovableterminalstrips.

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

 ACpowered

TableofContents

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

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

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

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

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

ControllerLogic:..........................................................................................................................................6

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

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

Elect

rical..................................................................................................................................................................8

 VACPowerInputWiring:............................................................................................................................8

 RelayInputWiring:.....................................................................................................................................8

 Changingfrom120to240VAC...................................................................................................................8

Wiring:.....................................................................................................................................................................9

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

Installation..............................................................................................................................................................9

ApplicationExamples............................................................................................................................................10

 LEDIndication:..........................................................................................................................................10

 LowFlowAlarm:........................................................................................................................................11

 DualFlowAlarms:.....................................................................................................................................11

FlowSwitchCalibration:.......................................................................................................................................12

 SetPoints:.................................................................................................................................................12

Appendix...............................................................................................................................................................13

 ControllerLogic.........................................................................................................................................13

 Troubleshooting........................................................................................................................................13

 RelayLatchLogic(LVCN‐131Seriesonly).................................................................................................14

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 4

SPECIFICATIONS/DIMENSIONS StepTwo

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

Consumption: 5Wattsmax.

Sensorinputs: LVCN‐141:(1)flowswitch

 LVCN‐131:(2)flowswitches

Sensorsupply: 24VDC@100mA

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

Contacttype: LVCN‐141:(1)SPDTRelay

 LVCN‐131:(2)SPDTRelays

Contactrating: 250VAC@10A

Contactoutput: SelectableNOorNC

Contactdelay: 0to60seconds

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

Classification: Generalpurpose

Compliance: CE:EN61326EM/EN61010‐1

Safety

LVCN‐141seriesfaceplate:1sensorinput,1relayoutput.

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LVCN‐131seriesfaceplate:2sensorinput,2relayoutputs.

Onerelayforeachsensorinput.

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The LVCN‐131 Series can also be used as a level controller

with 3 sensor inputs and 2 relay outputs.One relay is

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

TopView

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SideView

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InternalControllerLogic

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 5

SAFETYPRECAUTIONS StepThree

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

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

OMEGA ENGINEERING: LVCN‐141 and LVCN‐131 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‐131/‐141 series remote mount flow controllers

should not be used with explosive or flammable liquids, which require an intrinsically safe or explosion

proof.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 ci

rcuit may be necessary for

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

Components:

 LVCN‐141‐SingleInput,SingleRelayOutput120VACFlow/No‐FlowController

 LVCN‐141‐CE‐SingleInput,SingleRelayOutput120VACFlow/No‐FlowControllerw/CECompliance

 LVCN‐131‐DualInput,DualRelayOutput120VACFlow/No‐FlowController

 LVCN‐131‐CE‐DualInput,DualRelayOutput120VACFlow/No‐FlowControllerw/CECompliance

 Owner’sManual



 6

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ENGINEERI NG

products, such examples are for information only and are not intended as a compl ete guide to installing any

specificsystem.

ControllerLogic:

LVCN‐141 Series:The LVCN‐141 series features a

singlesensorinput andasinglerelayoutput.Connect

theswitchinputtoInput1terminal.Wirethedevice

youwanttocontroltoRelay1terminal.

LVCN‐131 Series:The LVCN‐131 series features a

three(3)sensorinputsandatwo(2)relayoutput.In

amajorityofapplications,theLVCN‐131serieswillbe

used as a 2 input / 2 relay output controller.In this

case, Sensor Input 1 directly controls Relay 1 and

SensorInput2AdirectlycontrolsRelay2.



Note:IfthelatchswitchisturnedON,thenRelay2requiresbothInputs2A&2Btobeinthesamestatebeforeit

willswitch.Thisrelaylogicisidealforautomaticfillingoremptyingoftanksandisnotusedforflow/no‐flow

applications.If using the LVCN‐131 series as a flow / no‐flow controller, make sure the Latch switch is turned

OFF. 

 7

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

TheLVCN‐131/‐141SeriesmaybeusedwithalmostanyOmegaEngineeringflowwitharelayoutput(FST‐200

& FST‐300 Series).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 the LVCN‐131/‐141 Series are pump

protection,no‐flowindicationorchemicalinjection.

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

1. Powerindic ator: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): 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. 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FloworNo‐Flowstatusofswitch.WhenswitchisClosed,

LEDwillbe Amber.WhenswitchisOpen,LEDwilleitherbeOFF.Note:Consultthemanualfortheflow

switchtodetermineexactwiringaswellasswitchpolarity(OpenorClosedduringFlow).

7. Invertswitch:Thisswitchreversesthelogicoftherelaycontrolinresponsetotheswitch:conditionsthat

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

8. Latchswitch(LVCN‐131seriesonly):Thisswitchdetermineshowtherelaywillbeenergizedinresponse

toeitheroneinput(Input2A)ortwoinputs(Inputs2Aand2B).WhenLATCHisOFF,therelayrespondsto

sensorInput2A only; whenLATCHis ON, therelay willenergize or de‐energize onlywhen bothswitches

(2A and 2B) are in the same state (both open or both closed).Note:In a majority of flow / no‐flow

applications,thelatchwillbeturnedOFF.

9. Inputtermi

nals:Connecttheswitchwirestotheseterminals:(+)isa24VDC,100mApowersupply,(‐)is

thereturnpathfromthesensorand(S)isapoweredswitchinput(14VDC,25mA).Consulttheflowswitch

manualforswitchpolarity(Ex:OpenorClosedforFlow)aswellaswiringinformation.

 8

ELECTRICAL StepFive

VACPowerInputWiring:ObservethePOWERSUPPLYlabelontheLVCN‐131/‐141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.





RelayInputWiring:Therelayisadry‐contactsinglepole,doublethrow(SPDT)typeratedat250VAC,10Amps.

Therelayisdesignedtoswitchpoweronandofftoadevice.Thereisnoactivepowerwithintherelaycontacts

alone.Powermustbeintroducedfromsecondarysourceorfromthepowerbeingused bythecont roller.

Powerfromasecondarysource



Powerfromthesamesourceasthecontroller



The two terminal Normally Open (NO) and Normally Closed (NC) 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.Both terminals share  the

Common(C)terminal.Whenrelayisde‐energized,CtoNOwillbeopenandCtoNC

will be closed.When relay is energized, C to NO will be closed and C to NC willbe

open.Ifpower is removed tothe controller,therelay willreturn toa de‐energiz

ed

state.



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an

d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



 9

WIRING/INSTALLATION StepSix

Connecting flow switches to input terminals:The type of flow switch from Omega Engineering that is

compatible with the LVCN‐131/‐141 series of controller is either the FST‐200 or FST‐300 series.The flow

switches have a relay output and 4 wires as the output (Red, Black, Green and White).See the illustration

below toindicate wiring for your switchand the polarity oftheswitchoutput.Note:the Shield wire willbe

usedonlyforlongcablerunsorwhereexcessiveelectricalnoiseispresent.

StandardRelayOutputFlowSwitches

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.



 10

APPLICATIONEXAMPLES StepSeven

LEDIndication:UseLED'slocatedabovetheinputterminalstoindicatewhethertheswitchisinaFloworNo‐

Flow state. With the flow switch wired NC, the Amber LED indicates No‐Flow and no LED indicates flow.

WiringtheswitchNO(reversingtheRedandBlackwires),theAmberLEDindicatesFlowandnoLEDindicates

No‐Flow.

NCWiring

AmberLED

NCWiring

LEDOFF

NOWiring

AmberLED

NOWiring

LEDOFF







 11

APPLICATIONEXAMPLES StepSeven

LowFlowAlarm:Thegoalistoindicatewhentheflowratefallsbelowacertainpoint.Ifitdoes,analarmis

supposedtosound,alertingtheoperatorofalowflowcondition.TheflowswitchiswiredtoInput1andthe

alarmiswiredthroughRelay1.

Ifpowerisaccidentallycuttothecontroller,thesensor'sabilitytonotify

the operator of a low flow condition could be lost.The system must

alerttheoperatornotonlytolowflow,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 is when the sensor is in the flow

condition, and the relay will  be energized holding the alarm circuit

Open.

 IftheswitchiswiredNC,theinputLEDwillbeOFFandtherelay

LEDwillbeON.Soforthiswiringconfiguration,Invertshouldbe

settotheONposition.

 IftheswitchiswiredNO,theinputLEDandtherelayLEDwillbe

ON simultaneously.So for this wiring configuration, Invert

shouldbesettotheOFF(‐)position.



DualFlowAlarm:Thegoalistoindicatewhentheflowratefallsbelow

acertainpointontwodifferentlines.Ifitdoes,analarmissupposedto

sound,alertingtheoperatorofalowflowconditionforthespecificline.

For Line #1,the flow switch is wired to Input 1 and the al

arm is wired

through Relay1.For Line #2, the flow switch is wired to Input 2A and

thealarmiswiredthroughRelay2.

Accidentalpowercuttothecontrollermustbetakenintoaccountasin

theLowFlowAlarmexampleseenabove.FollowthesamelogicforLow

FlowAlarmaswithDualFlowAlarm.

In this application, the normal status is when the sensor is in the flow

condition, and the relay will  be energized holding the alarm circuit

Open.

 If the switches are wired NC, theinput LED will be OFF an

d the

relay LED will be ON.So for this wiring configuration, Invert

shouldbesettotheONposition.

 IftheswitchesarewiredNO,theinputLEDandtherelayLEDwill

be ON simultaneously.So for this wiring configuration, Invert

shouldbesettotheOFF(‐)position.

 12

FLOWSWITCHCALIBRATION StepEight

Set Points:If the preset factory calibration is not adequate for your application, follow the calibration steps

listedbelow.Note:theswitch'sinternalLEDwillbeonwhentheswitchdetectsno‐flowandwilloffwhenthe

switchdetectsflow.

1. Install the fitting and flow switch as described in the  Installation section of this manual.Turn the flow

switchandcontrollerpower on and adjust the flow rateto the application setting.Ifthe mediumto be

sensedislikelytobesubjecttohightemperaturevariations,theflowswitchshouldbesetat thehighest

normaltemperaturelikelytobeencountered.

2. Locate the potentiometer knob at the top of the flow switch.The red LED  is

visible through the potentiometer.(If the LED is on, slowly  adjust the 

potentiometer counterclockwise, with a small flat head screwdriver until the 

LEDturnsoff.)Theadjustmentisasingleturn270°potentiometer.Theinitial 

response time of the flow switch after adjustment is 1 to 10 seconds.Adjust

thepotentiometer inslow incrementsandwait forther espon se.If  theLED is

off, slowly adjust the potentiometer clockwise until the light turns on.Then

turn the potentiometer counterclockwise to bring the LED off at a reliable 

setting.Remember,adjustthepotentiometerin slowincrementsandwait for

there sponse.

3. Verifythatthenewcalibrationiscorrect bylo w e rin g thesystemflowratebelowthe

setpointand checktosee thatthe redLEDturns on.Then increasethe flowrate

abovethesetpointandverifyth attheredLEDturnsoffaccordingly.

LiquidSwitch

FST‐200Series

GasSwitch

FST‐300Series







 13

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. InputLED:ForNCswitchwiring,theinputLEDonthecontrollerwillbeAmberwhentheswitchreadsno‐

flowandOFFwhentheswitchreadsflow.

3. InvertOperation: 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

rela

yLEDwillbeOFFwhentheinputLEDisONandONwhentheinputLEDisOFF

.

4. RelayOperation:TherelaymaybewiredeitherNOorNC.Thenormalstate oftherelayiswhenitsLEDis

OFF.WiththeLEDON,therelayisintheenergizedmodeandallterminalconnectionsarereversed.



Troubleshooting:

PROBLEM SOLUTION

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.

A Flow or No‐Flow condition is

metbuttherelaydidnotswitch.

Check the relay by switching the invert switch.Confirm that

relayclickonandoffaswellastherelayLED.

The Flow or No‐Flow is not

switchingatthecorrectflowrate.

The flow switch may need to be adjusted.Review the Flow

SwitchCalibrationsectiononthepreviouspageforinstructions

on setting the actual flow switch.Note: access to the flow

switch adjustment is difficult and requires the removal of the

PCBassembly.Usecautionwhenperformingthisstep.

Trying to start the flow but the

controller keeps turning the flow

off.

Torestartaflowcondition,thesensorneedstosenseanactual

flow condition before changing the relay in the controller.A

flow switch over‐ride may need to be added across the relay

contacts that allows for a true flow to occur before switching

back to the controller.The use of a moment switch is

recommendedfortheover‐rideswitch.

RelayLEDdoesnotmatchmyflow

condition.

TherelayLEDcanbeswitchedbyeitherthereversingthewiring

of the sensor tothe controller or by flipping the invert switch.

This means that the relay LED can either be set to turn on

during a flow condition or to tu

rn off during a no‐flow

condition.This is all dependent on the wiring and the invert

position.

Relay LED does not match the

sensor’sLEDindicator.

Thesensor’sLEDwillalwaysbeONduringaNo‐Flowstateand

OFF during a Flow state, regardless of the switches wiring.As

per above the input LED can be inverted to any condition.In 

some applications, they will match and in others they will be

opposite.This is all dependent on the application

parameter/setup.

 14

APPENDIX StepNine

RelayLatchLogic(Relay2,LVCN‐131Seriesonly):Therelaycaneither

be an independent relay (high or low level alarm) or a latching relay

(automatic fill or empty) withlatch ON.With LatchOFF, therelaywill

only respond to the Input 2A.Input 2B will be ignored.This

configurationisidealforalarming,suchasflow,no‐flow,leakdetection,

highlevelorlowlevel.

Whenthe LatchswitchisON,Relay2 requiresthat bothInputs 2Aand

2Btobeinthesamestatebeforetherelaywillswitch.

Inan auto fillapplication, when thebottom switchis dry(top switchis

also dry) the relay will energize.The relay will remain in an energized

stateuntilthetopswitch becomeswet(bottomswitchisalsowet).At

this point, the relaywillde‐energize and remain de‐energized until the

bottomswitchbecomesdryagain.

Thesamelogicappliesforautoemptyapplications.Theonlychangeis

thatthe relaywillenergizewhenthetopiswet(bottomisalsowet)and

de‐energizewhenthebottomisdry(topisalsodry).

Inbothscenarios,whenthelevelisbetweenthetwosensors,therelay

willnot changestate, regardlessof isthe liquidis risingor falling.This

logicisidealforthecontrollingofliquidbetweentounique/differentset

points.Thedifferentialiscontrolledbythelocationofthetwosensors.

With Latch ON, the relay will

actuate when Input 2A and Input

2Bareinthesamecondition.The

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

until both inputs reverse their

state.

InvertOFF LatchOFF

Input2A Input2B Relay

ON

OFF

NoEffect

NoEffect

ON

OFF



InvertOFF LatchOFF

Input2A Input2B Relay

ON

OFF

NoEffect

NoEffect

OFF

ON



Caution:Some sensors may have

their own inverting capability

(wiredNOorNC).Thiswillchange

the logic of the invert switch.

Checkyoursystemdesign.

InvertOFF LatchON

Input2A Input2B Relay

ON

OFF

ON

OFF

ON

OFF

ON

NoChange

OFF



InvertON LatchON

Input2A Input2B Relay

ON

OFF

ON

OFF

ON

OFF

NoChange

ON





 15



 16



Omega LVCN-131 and LVCN-141 Owner's manual

Omega LVCN-131 and LVCN-141 Owner's manual

Omega LVCN-131 and LVCN-141 Owner's manual

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