Omega LVCN11 and 12 Series Owner's manual

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

Offeredinsmallandlargesizes,thecompactjunctionboxisidealforsensorwiringandconduittermination.

The junction box isuniversally compatiblewith our level switch, flow switch and fitting products.The small

enclosure(LVCN‐12series)has6polesandistypicallyusedwithasinglelevelorflowswitchsensor.Thelarge

enclosure(LVCN‐11series)has12polesformultiplelevelswitchesandistypicallyusedwithSmartTrak.

Features

 PolypropyleneenclosureratedNEMA4Xwith300°conduitswivelbase.

 CompatiblewithOmegaEngineeringsensors,installationfittingsandalarms.

 Removableterminalstripswithupperandlowerscrewpoles.

 Offeredinlargeandsmallsizesforsingleormulti‐pointinstallations.

TableofContents

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

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

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

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

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

Installation..............................................................................................................................................................7

MountingtoaSensor:...............................................................................................................................7

MountingtoaLVM‐10seriesorLVM‐51series:.......................................................................................8

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SPECIFICATIONS/DIMENSIONS StepTwo

Sensorinput: LVCN‐11:1‐4sensors

 LVCN‐12:1‐2sensors

Terminalstrip: LVCN‐11:12polesocket

 LVCN‐12:6polesocket

Max.currentcapacity: 26Amps

Max.voltage: 380V

Wirestripping: 0.5mmor0.2”

Terminalscrewtorque:3.5in‐lbs.

Wiregauge: 22‐14AWGCu(copper)

Enclosurerating: NEMA4X(IP65)

Enclosurematerial: Polypropylene(U.L.94VO)

Enclosurerotation: 300°swivelbase

Temperaturerange.: F:‐40°to158°

 C:‐40°to70°

Conduitentrance: Single,½”NPT

Mountingconnection: Single,¾”NPT

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TopVieww/oCap

LVCN‐11Series

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TopVieww/oCap

LVCN‐12Series

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SideView

LVCN‐11Series

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SideView

LVCN‐12Series

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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 theCompactJunctionBoxes fromOmegaEngineering:LVCN‐11and

LVCN‐12Series.Pleaserefertothepartnumberlocatedonthelabeltoverifytheexactmodelwhichyou

havepurchased.Manyaspectsofinstallationandusearesimilarbetweenmodels.

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 junction box 

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junctionboxthatcarryhighvoltage,

causingseriousinjuryordeath.Allpowertothecircuitsintheterminalstrip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:  Sensor 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:Whilethecompact junctionbox isliquid‐resistantwheninstalledproperly, itis

not designed to be immersed.Itshould be mounted in such a waythat it does not normally comeinto

contactwithfluid.ItshousingismadeoutofPP(propylene).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.

Application:The LVCN‐11 series junction box is commonly used for the local termination of multiple

switches installed on a LVM‐10 series mounting system.The LVCN‐12 series junction box is commonly

used for the local termination of a single  level or flow switch.Combine these junction boxes with any

switchorfittingassemblytocompleteyourapplication.

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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.

Allpowertothesystemmustbeturnedoffbeforeinstallingthehousing.

Important:Donotstripmorethat0.25”ofinsulationfromany wirethatwillbeconnectedtotheterminal

strip.Longer un‐insulated wire may contact the terminal strip panel, causing a short circuit leading to a

systemfailure.

All wiring between a controller  and sensor(s) should be in conduit.The power entrance of the terminal

strip housing  is a stand a rd ½” NPT female fitting that will attach to a standard electrical conduit, either

plastic or metal, as specified by local codes.Keep in mind that the housing may have to be unscrewed

fromthesens

orforperiodiccleaningofthesensor.Forthisreasontheuseofflexibleconduit,providing

enoughslackforeasyaccessisrecommended.

Usecaution wheninstalling theconduit.Excessivetightening maybreak thefitting.Suchdamage  isnot

coveredbythewarranty.

In some cases, additional user‐provided components may need to be attached to the terminals.If so,

make sure that both wires and/or components entering the  terminal are secure after the screws are

tightened.

Components:

 LVCN‐11 ‐Multi‐Input(12‐pole)JunctionBox,NPTThread

 LVCN‐12 ‐Single‐Input(6‐pole)JunctionBox,NPTThread

 Owner’sManual

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 7

INSTALLATION StepFour

MountingonaSensor:Thefollowingprocedureshouldbeusedwhenmountingthejunctionboxdirectlyona

sensor.Allpowertothesystemmustbeoffbeforeinstallingthejunctionbox.

1. Preparethesensor:Thefollowinginstructionsassumethesensorisalreadymountedinapositionon

itstank orfitting (asdescribed inthe sensormanual).Note thatbecause theinsulation jacketof the

sensorislessflexiblethanmost(toensurechemicalcompatibility),itisimportantthatyoufollowthe

instructionsexactly.

a. Cutthewire4‐1/4”fromthetopofthesensor.

b. Usinga10gaugewirestripper,stripthewhiteouterlayerofinsulationfromthelast1‐1/4”of

thesensorwire.Trimoffanddiscardtheexposedfoilshieldflushwiththeinsulationjacket.In

longcableruns,donotcutoffthedrainwire.

c. Usinga20gaugewirestripper,stripthelast¼”ofinsulationfromthesignalwires.

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Important:Donotstripmorethan0.2”(5mm)ofinsulationfromanywirethatwillbeconnectedto the

terminal strip.Longer insulated wire may contact the terminal strip panel, causing a short circuit

leadingtoasystemfailure.

2. Position the junction box on the sensor:To make the mounting and wiring easier, you must first

removetheterminalstripfromthejunctionbox.

a. Unscrewthelidofthejunctionbox.

b. Gentlytipthejunctionboxtoslideouttheterminalstrippanel,andplace

itaside.

c. Threadthepre ‐trimmedsensorwiresthroughthe¾”NPTentrancetothe

junctionbox,andplacethejunctionboxinpositionoverthesensor.

d. Being careful not to cross the threads, screw the junction box on the

sensor.Stopwhenthecapofthesensorbecomesflushwiththebottom

wallofthejunctionbox,orwhenthe½”powerconduit entranceisinthe 

desiredlocation.

3. Connectthesensorinputwires:

a. Routethesensor‐wiresoit staysasclose tothehousingaspossible,but

donotbendthewiresharplyatthecapofthesensor.(Iftheinstallation

allows,youmayrotatethejunction boxand/or thesensoruntil thewire

outletofthesensorisinthebestposition.)

b. Position the terminal strip panel in the housing aligned with the two

channelsdesignedtoholdit.Donotinsertthepanelalltheway intothe

housing,butletitrestonthetopofthehousingtofacilitatethewiring.

c. Usinga smallscrewdriver,loosen theterminalscrews.Insert thesensor

wiresintotheholeonthelowersideoftheterminalstrip,andtightenthe

terminalscrews.

4. Mechanicalconnectiontoconduit:Allwiringbetweenacontrollerandsensors

should be in conduit.The power entrance of the junction box is a standard ½”

NPTfemalefittingthatwillattachtostandardelectricalconduit,eitherplasticor

metal,asspecifiedbylocalcodes.Keepinmindthatthehousingmayhavetobe

unscrewed from the sensor for periodic cleaning of the sensor.

For this reason the use of flexible

conduit,providingenoughslackforeasyaccessisrecommended.

INSTALLATION(continued) StepFour

5. Connecttheextensionwiring:

Beforemakingconnections,makesureallpowertothesystem(controller,motor,valve,alarm,etc.)

isOFFwithasafetylockoutonthecircuitbreaker.

a. Theextensionwiringtosensorsshouldbeofthesametypeasthesensors.Iftherunislong,it

mayneedtobeaslightlythickergaugesotheseriesresistanceiskelpwithinallowablelimits.

b. Threadtheextensionwiringthroughthepowerconduitentranceofthehousing.

c. Strip¼”oftheinsulationfromtheendsofthewires.

d. Loosentheupperterminalscrews.Inserttheextensionwiresintothecorrespondingterminals,

matchingthesensorwires.

e. Tightentheterminalscrews.

f. Slidetheterminalstrippanelbackintothehousing,makingsureitisinthegroveprovidedon

eachsideofthehousing.Thepanel“floats”inthehousing,heldinpositionbythewiring.

g. Screwthelidofthehousingbackon.

Note:In somecases,additional user‐providedcomponentsmayneed tobe attachedtothe terminals.If

so, make sure that both wires and/or components entering the terminal are secure after the screws are

tightened.

MountingonaLVM‐10seriesorLVM‐51series:AterminalstripmaybemounteddirectlyonaLVM‐10series

or LVM‐51 series mounting system.The only differenc

e between mounting on a LVM‐10 series, a LVM‐51

seriesor directly on asensor is inthe length ofthe  wiring from the sensor(s).Assumingthat eachsensor is

already mounted in position, cut the sensor wires to the length approximately 1‐1/2” above the top of the

housing.However,besuretomake allowanceswhencuttingthe sensorleadsfor futureadjustmentstothe

sensorposition.

MountingtoLVM‐10Series

MountingSystem

MountingtoLVM‐51Series

MountingSystem



Note:Alwaystightenthecontrollerfromthe wrenchflatlocatedonthe

swivelbase.Nevertightenfromthebodyofthecontroller.



 9







 11





Omega LVCN11 and 12 Series Owner's manual

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