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

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INTRODUCTION/TABLEOFCONTENTS StepOne
The generalpurpose flow controller is offered in two configurations for lowflow pump and process
protection.The LVCN141 Series accepts one flow sensor input and provides one 10A relay for low flow
control.The LVCN131Seriesacceptstwo flowsensorinputs and providestwo 10Arelays fordual lowflow
control.Packagethis flow controller withourliquidor gas flow switch sensors.Forfield mount installation,
addasingleordualcontrollerNEMAbox.
Features
FailSaferelaycontrolofpumps,valvesoralarmswitha0to60seconddelay.
EasysetupwithLEDindicatorsforsensor(s),powerandrel
aystatus.
35mmDINrailmountpolypropyleneenclosurewithremovableterminalstrips.
InvertswitchchangesrelaystatefromNOtoNCwithoutrewiring.
ACpowered
TableofContents
Specifications:.........................................................................................................................................................4
Dimensions:.............................................................................................................................................................4
SafetyPrecautions:.................................................................................................................................................5
Components:...............................................................................................................................................5
MakeaFailSafeSystem:............................................................................................................................6
ControllerLogic:..........................................................................................................................................6
GettingStarted:.......................................................................................................................................................7
GuidetoControls:.......................................................................................................................................7
Elect
rical..................................................................................................................................................................8
VACPowerInputWiring:............................................................................................................................8
RelayInputWiring:.....................................................................................................................................8
Changingfrom120to240VAC...................................................................................................................8
Wiring:.....................................................................................................................................................................9
ConnectingSwitchestoInputTerminals:...................................................................................................9
Installation..............................................................................................................................................................9
ApplicationExamples............................................................................................................................................10
LEDIndication:..........................................................................................................................................10
LowFlowAlarm:........................................................................................................................................11
DualFlowAlarms:.....................................................................................................................................11
FlowSwitchCalibration:.......................................................................................................................................12
SetPoints:.................................................................................................................................................12
Appendix...............................................................................................................................................................13
ControllerLogic.........................................................................................................................................13
Troubleshooting........................................................................................................................................13
RelayLatchLogic(LVCN131Seriesonly).................................................................................................14

4
SPECIFICATIONS/DIMENSIONS StepTwo
Supplyvoltage: 120/240VAC,50‐60Hz.
Consumption: 5Wattsmax.
Sensorinputs: LVCN141:(1)flowswitch
LVCN131:(2)flowswitches
Sensorsupply: 24VDC@100mA
LEDindication: Sensor,power&relaystatus
Contacttype: LVCN141:(1)SPDTRelay
LVCN131:(2)SPDTRelays
Contactrating: 250VAC@10A
Contactoutput: SelectableNOorNC
Contactdelay: 0to60seconds
Electronicstemp.: F:‐40°to158°
C:‐40°to70°
Enclosurerating: 35mmDIN(EN50022)
Enclosurematerial: PP(U.L.94VO)
Failsafety: Powerfailsafe
Classification: Generalpurpose
Compliance: CE:EN61326EM/EN610101
Safety
LVCN141seriesfaceplate:1sensorinput,1relayoutput.
LVCN131seriesfaceplate:2sensorinput,2relayoutputs.
Onerelayforeachsensorinput.
The LVCN131 Series can also be used as a level controller
with 3 sensor inputs and 2 relay outputs.One relay is
latchingandtheotherisasingleinputrelay.
TopView
SideView
InternalControllerLogic

5
SAFETYPRECAUTIONS StepThree
AboutThisManual:PLEASEREADTHE ENTIREMANUALPRIORTOINSTALLINGORUSINGTHISPRODUCT.
This manual includes information on three different models of Remote Relay Flow Controllers from
OMEGA ENGINEERING: LVCN141 and LVCN131 series.Many aspectsof installation and use are similar
betweenthethreemodels.Wheretheydiffer,themanualwillnoteit.Pleaserefertothepartnumberon
thecontrolleryouhavepurchasedasyouread.
User’s Responsibilityfor Safety:OMEGA ENGINEERINGmanufactures several modelsof controller, with
differentmountingandswitchingconfigurations.Itistheuser’sresponsibilitytoselectacontrollermodel
that is appropriate for the application, install it properly, perform tests of the installed system, and
maintainallcomponents.
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,useextremecautionanduseonlyinsulatedtools.Makingadjustmentstopoweredcontrollers
isnotrecommended.Wiringshouldbeperformedbyqualifiedpersonnelinaccordancewithallapplicable
national,stateandlocalelectricalcodes.
Flammable or Explosive Applications: The entire LVCN131/141 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
Engineeringrepresentativeforfurtherinformation.
InstallInaDryLocation:Thecontrollerhousingisnotdesignedtobe immersed.Wheninstalledproperly,
itshould bemountedin suchaway thatit doesnotnormally comeintocontact withliquid.Refertoan
industryreferencetoensurethatcompoundsthatmaysplashontothecontrollerhousingwillnotdamage
it.Suchdamageisnotcoveredbythewarranty.
RelayContactRating:Therelayisratedfora10ampresistiveload.Manyloads(suchasamotorduring
startuporincandescentlights)arereactiveandmayhaveaninrush currentcharacteristicthatmaybe10
to 20 times their steadystate load rating.The use of a contact protection ci
rcuit may be necessary for
yourinstallationifthe10ampratingdoesnotprovideanamplemarginforsuchinrushcurrents.
Components:
LVCN141‐SingleInput,SingleRelayOutput120VACFlow/NoFlowController
LVCN141CE‐SingleInput,SingleRelayOutput120VACFlow/NoFlowControllerw/CECompliance
LVCN131‐DualInput,DualRelayOutput120VACFlow/NoFlowController
LVCN131CE‐DualInput,DualRelayOutput120VACFlow/NoFlowControllerw/CECompliance
Owner’sManual

6
SAFETYPRECAUTIONS(cont.) StepThree
Make a FailSafe System: Design a failsafe system that accommodates the possibility of relay or power
failure.If power is cut off to the controller, it will deenergize the relay.Make sure that the deenergized
stateoftherelayisthesafestateinyourprocess.Forexample,ifcontrollerpowerislost,apumpfillingatank
willturnoffifitisconnectedtotheNormallyOpensideoftherelay.
While the internal relay is reliable, over the course of time relay failure is possible in two modes: under a
heavyloadthecontactsmaybe“welded”orstuckintotheenergizedposition,orcorrosionmaybuildupona
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
differentsensortechnologieswherepossible.
WhilethismanualofferssomeexamplesandsuggestionstohelpexplaintheoperationofOMEGAENGINEERI NG
products, such examples are for information only and are not intended as a compl ete guide to installing any
specificsystem.
ControllerLogic:
LVCN141 Series:The LVCN141 series features a
singlesensorinput andasinglerelayoutput.Connect
theswitchinputtoInput1terminal.Wirethedevice
youwanttocontroltoRelay1terminal.
LVCN131 Series:The LVCN131 series features a
three(3)sensorinputsandatwo(2)relayoutput.In
amajorityofapplications,theLVCN131serieswillbe
used as a 2 input / 2 relay output controller.In this
case, Sensor Input 1 directly controls Relay 1 and
SensorInput2AdirectlycontrolsRelay2.
Note:IfthelatchswitchisturnedON,thenRelay2requiresbothInputs2A&2Btobeinthesamestatebeforeit
willswitch.Thisrelaylogicisidealforautomaticfillingoremptyingoftanksandisnotusedforflow/noflow
applications.If using the LVCN131 series as a flow / noflow controller, make sure the Latch switch is turned
OFF.
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GETTINGSTARTED(continued) StepFour
TheLVCN131/141SeriesmaybeusedwithalmostanyOmegaEngineeringflowwitharelayoutput(FST200
& FST300 Series).The relay isasingle pole, double throw type; the controlled device can be connected to
eitherthenormallyopen ornormallyclosedsideof therelay.Atimedelayfrom0to60secondscanbeset
before the relay responds to the sensor input.Typical applications for the LVCN131/141 Series are pump
protection,noflowindicationorchemicalinjection.
GuidetoControls:Belowisalistingandthelocationofthedifferentcomponentsforthecontroller:
1. Powerindic ator:ThisgreenLEDlightswhenACpoweris
ON.
2. Relay indicator: This red LED will light whenever the
controllerenergizestherelay,inresponsetotheproper
conditionatthesensorinput(s)andafterthetimedelay.
3. AC Power terminals: Connection of 120 VAC power to
thecontroller.Thesetting maybechanged to240VAC
ifdesired.This requireschanging internal jumpers; this
is covered in the Installation section of the manual.
Polarity(neutralandhot)doesnotmatter.
4. Relay terminals (NC, C, NO): Connect the device you
wishtocontrol(pump,alarmetc.)totheseterminals:supplytotheCOMterminal,andthedevicetothe
NOorNCterminalasrequired.Theswitcheddeviceshouldbeanoninductiveloadofnotmore than10
amps;forreactiveloadsthecurrentmustbederatedorprotectioncircuitsused.WhentheredLEDisON
andtherelayisintheenergizedstate,theNOterminalwillbeclosedandtheNCterminalwillbeopen.
5. Time delay: Use potentiometer to set delay from 0.15 to 60 seconds.Delay occurs during switch make
andswitchbreak.
6. Inputindicators:UsetheseLEDsforindicatingFloworNoFlowstatusofswitch.WhenswitchisClosed,
LEDwillbe Amber.WhenswitchisOpen,LEDwilleitherbeOFF.Note:Consultthemanualfortheflow
switchtodetermineexactwiringaswellasswitchpolarity(OpenorClosedduringFlow).
7. Invertswitch:Thisswitchreversesthelogicoftherelaycontrolinresponsetotheswitch:conditionsthat
usedtoenergizetherelaywillnowdeenergizetherelayandviceversa.
8. Latchswitch(LVCN131seriesonly):Thisswitchdetermineshowtherelaywillbeenergizedinresponse
toeitheroneinput(Input2A)ortwoinputs(Inputs2Aand2B).WhenLATCHisOFF,therelayrespondsto
sensorInput2A only; whenLATCHis ON, therelay willenergize or deenergize onlywhen bothswitches
(2A and 2B) are in the same state (both open or both closed).Note:In a majority of flow / noflow
applications,thelatchwillbeturnedOFF.
9. Inputtermi
nals:Connecttheswitchwirestotheseterminals:(+)isa24VDC,100mApowersupply,()is
thereturnpathfromthesensorand(S)isapoweredswitchinput(14VDC,25mA).Consulttheflowswitch
manualforswitchpolarity(Ex:OpenorClosedforFlow)aswellaswiringinformation.
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ELECTRICAL StepFive
VACPowerInputWiring:ObservethePOWERSUPPLYlabelontheLVCN131/141series.Thelabelidentifies
thepowerrequirement(120or240VAC)andtheterminalwiring.Note:PolaritydoesnotmatterwiththeAC
inputterminal.

RelayInputWiring:Therelayisadrycontactsinglepole,doublethrow(SPDT)typeratedat250VAC,10Amps.
Therelayisdesignedtoswitchpoweronandofftoadevice.Thereisnoactivepowerwithintherelaycontacts
alone.Powermustbeintroducedfromsecondarysourceorfromthepowerbeingused bythecont roller.
Powerfromasecondarysource
Powerfromthesamesourceasthecontroller
The two terminal Normally Open (NO) and Normally Closed (NC) will be used in
differentapplications.Rememberthatthe"normal"stateiswhentherelaycoilisde
energized and the Red relay LED is Off / deenergized.Both terminals share the
Common(C)terminal.Whenrelayisdeenergized,CtoNOwillbeopenandCtoNC
will be closed.When relay is energized, C to NO will be closed and C to NC willbe
open.Ifpower is removed tothe controller,therelay willreturn toa deenergiz
ed
state.
Changingfrom120to240VAC:
1. Remove the back panel of the controller and
gently slide the printed circuit board from the
housing.UsecautionwhenremovingthePCB.
2. LocatedjumpersJW1,JW2andJW3onthePCB.
3. Tochangeto240VAC,removejumpersfromJW1
andJW2an
dplaceasinglejumperacrossJW3.To
changeto120VAC,removejumperJW3andplace
jumpersacrossJW1andJW2.
4. Gently return PCB into housing and replace back
panel.
120VAC 240VAC
Configuration Configuration

9
WIRING/INSTALLATION StepSix
Connecting flow switches to input terminals:The type of flow switch from Omega Engineering that is
compatible with the LVCN131/141 series of controller is either the FST200 or FST300 series.The flow
switches have a relay output and 4 wires as the output (Red, Black, Green and White).See the illustration
below toindicate wiring for your switchand the polarity oftheswitchoutput.Note:the Shield wire willbe
usedonlyforlongcablerunsorwhereexcessiveelectricalnoiseispresent.
StandardRelayOutputFlowSwitches
PanelDIN Rail Mounting:Thecontroller maybemounted byeitheraback panelusing twoscrews through
mountingholeslocatedatthecornersofthecontrollerorbysnappingthecontrolleron35mmDINRail.

Note:Alwaysinstallthecontrollerinalocationwhereitdoesnotcomeintocontactwithliquid.

10
APPLICATIONEXAMPLES StepSeven
LEDIndication:UseLED'slocatedabovetheinputterminalstoindicatewhethertheswitchisinaFloworNo
Flow state. With the flow switch wired NC, the Amber LED indicates NoFlow and no LED indicates flow.
WiringtheswitchNO(reversingtheRedandBlackwires),theAmberLEDindicatesFlowandnoLEDindicates
NoFlow.
NCWiring
AmberLED
NCWiring
LEDOFF
NOWiring
AmberLED
NOWiring
LEDOFF


11
APPLICATIONEXAMPLES StepSeven
LowFlowAlarm:Thegoalistoindicatewhentheflowratefallsbelowacertainpoint.Ifitdoes,analarmis
supposedtosound,alertingtheoperatorofalowflowcondition.TheflowswitchiswiredtoInput1andthe
alarmiswiredthroughRelay1.
Ifpowerisaccidentallycuttothecontroller,thesensor'sabilitytonotify
the operator of a low flow condition could be lost.The system must
alerttheoperatornotonlytolowflow,buttocontroller powerloss.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 thealarm willsound (ifthere isstillpower tothe alarm
circuit itself).The alarm circuit should have a noninterruptible power
supply or some other indicator or backup alarm to warn of a power
failureinthealarmcircuit.
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.
IftheswitchiswiredNC,theinputLEDwillbeOFFandtherelay
LEDwillbeON.Soforthiswiringconfiguration,Invertshouldbe
settotheONposition.
IftheswitchiswiredNO,theinputLEDandtherelayLEDwillbe
ON simultaneously.So for this wiring configuration, Invert
shouldbesettotheOFF()position.
DualFlowAlarm:Thegoalistoindicatewhentheflowratefallsbelow
acertainpointontwodifferentlines.Ifitdoes,analarmissupposedto
sound,alertingtheoperatorofalowflowconditionforthespecificline.
For Line #1,the flow switch is wired to Input 1 and the al
arm is wired
through Relay1.For Line #2, the flow switch is wired to Input 2A and
thealarmiswiredthroughRelay2.
Accidentalpowercuttothecontrollermustbetakenintoaccountasin
theLowFlowAlarmexampleseenabove.FollowthesamelogicforLow
FlowAlarmaswithDualFlowAlarm.
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, theinput LED will be OFF an
d the
relay LED will be ON.So for this wiring configuration, Invert
shouldbesettotheONposition.
IftheswitchesarewiredNO,theinputLEDandtherelayLEDwill
be ON simultaneously.So for this wiring configuration, Invert
shouldbesettotheOFF()position.
12
FLOWSWITCHCALIBRATION StepEight
Set Points:If the preset factory calibration is not adequate for your application, follow the calibration steps
listedbelow.Note:theswitch'sinternalLEDwillbeonwhentheswitchdetectsnoflowandwilloffwhenthe
switchdetectsflow.
1. Install the fitting and flow switch as described in the Installation section of this manual.Turn the flow
switchandcontrollerpower on and adjust the flow rateto the application setting.Ifthe mediumto be
sensedislikelytobesubjecttohightemperaturevariations,theflowswitchshouldbesetat thehighest
normaltemperaturelikelytobeencountered.
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
LEDturnsoff.)Theadjustmentisasingleturn270°potentiometer.Theinitial
response time of the flow switch after adjustment is 1 to 10 seconds.Adjust
thepotentiometer inslow incrementsandwait forther espon se.If theLED 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,adjustthepotentiometerin slowincrementsandwait for
there sponse.
3. Verifythatthenewcalibrationiscorrect bylo w e rin g thesystemflowratebelowthe
setpointand checktosee thatthe redLEDturns on.Then increasethe flowrate
abovethesetpointandverifyth attheredLEDturnsoffaccordingly.
LiquidSwitch
FST200Series
GasSwitch
FST300Series


13
APPENDIX StepNine
ControllerLogic:Pleaseusethefollowingguidetounderstandtheoperationofthecontrollers.
1. PowerLED:MakesuretheGreenpowerLEDisONwhenpowerissuppliedtothecontroller.
2. InputLED:ForNCswitchwiring,theinputLEDonthecontrollerwillbeAmberwhentheswitchreadsno
flowandOFFwhentheswitchreadsflow.
3. InvertOperation: Whenthe inputLEDturn OFFand ON,the relayLEDwillalso switch.WithinvertOFF,
therelayLEDwillbeONwhentheinputLEDisONandOFFwhentheinputLEDisOFF.WithinvertON,the
rela
yLEDwillbeOFFwhentheinputLEDisONandONwhentheinputLEDisOFF
.
4. RelayOperation:TherelaymaybewiredeitherNOorNC.Thenormalstate oftherelayiswhenitsLEDis
OFF.WiththeLEDON,therelayisintheenergizedmodeandallterminalconnectionsarereversed.
Troubleshooting:
PROBLEM SOLUTION
Controllerispowered,butnothing
happens.
FirstcheckthePowerLEDtomakesureitisGreen.Ifnot,check
the wiring, power and make sure the terminal is seated
correctlyoverthe6pins.
A Flow or NoFlow condition is
metbuttherelaydidnotswitch.
Check the relay by switching the invert switch.Confirm that
relayclickonandoffaswellastherelayLED.
The Flow or NoFlow is not
switchingatthecorrectflowrate.
The flow switch may need to be adjusted.Review the Flow
SwitchCalibrationsectiononthepreviouspageforinstructions
on setting the actual flow switch.Note: access to the flow
switch adjustment is difficult and requires the removal of the
PCBassembly.Usecautionwhenperformingthisstep.
Trying to start the flow but the
controller keeps turning the flow
off.
Torestartaflowcondition,thesensorneedstosenseanactual
flow condition before changing the relay in the controller.A
flow switch override 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
recommendedfortheoverrideswitch.
RelayLEDdoesnotmatchmyflow
condition.
TherelayLEDcanbeswitchedbyeitherthereversingthewiring
of the sensor tothe 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 noflow
condition.This is all dependent on the wiring and the invert
position.
Relay LED does not match the
sensor’sLEDindicator.
Thesensor’sLEDwillalwaysbeONduringaNoFlowstateand
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 StepNine
RelayLatchLogic(Relay2,LVCN131Seriesonly):Therelaycaneither
be an independent relay (high or low level alarm) or a latching relay
(automatic fill or empty) withlatch ON.With LatchOFF, therelaywill
only respond to the Input 2A.Input 2B will be ignored.This
configurationisidealforalarming,suchasflow,noflow,leakdetection,
highlevelorlowlevel.
Whenthe LatchswitchisON,Relay2 requiresthat bothInputs 2Aand
2Btobeinthesamestatebeforetherelaywillswitch.
Inan auto fillapplication, when thebottom switchis dry(top switchis
also dry) the relay will energize.The relay will remain in an energized
stateuntilthetopswitch becomeswet(bottomswitchisalsowet).At
this point, the relaywilldeenergize and remain deenergized until the
bottomswitchbecomesdryagain.
Thesamelogicappliesforautoemptyapplications.Theonlychangeis
thatthe relaywillenergizewhenthetopiswet(bottomisalsowet)and
deenergizewhenthebottomisdry(topisalsodry).
Inbothscenarios,whenthelevelisbetweenthetwosensors,therelay
willnot changestate, regardlessof isthe liquidis risingor falling.This
logicisidealforthecontrollingofliquidbetweentounique/differentset
points.Thedifferentialiscontrolledbythelocationofthetwosensors.
With Latch ON, the relay will
actuate when Input 2A and Input
2Bareinthesamecondition.The
relay will not change its condition
until both inputs reverse their
state.
InvertOFF LatchOFF
Input2A Input2B Relay
ON
OFF
NoEffect
NoEffect
ON
OFF
InvertOFF LatchOFF
Input2A Input2B Relay
ON
OFF
NoEffect
NoEffect
OFF
ON
Caution:Some sensors may have
their own inverting capability
(wiredNOorNC).Thiswillchange
the logic of the invert switch.
Checkyoursystemdesign.
InvertOFF LatchON
Input2A Input2B Relay
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
NoChange
NoChange
OFF
InvertON LatchON
Input2A Input2B Relay
ON
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
NoChange
NoChange
ON

15
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