Sea Tel Side Exit Manuel utilisateur

Procedure, Field Replacement, Level Cage Kit, Side Exit

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Document No

135265 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



1. BriefSummary:

Troubleshootingdocumentfordiagnosingafaultwithandreplacingthelevelcageassembly.

2. Checklist:

VerifyRemoteTilt

VerifyInitialization

VerifySensorOutputsusingDacRemP

AzimuthandRelativeTargeting

DriftandSensorMonitoring

3. TheoryofOperation:

Thelevelcagecontains4sensors,afluidfilledtiltsensorwhichisusedasthesystemshorizonreference(levelposition)

aswellaslongtermstabilizationreference,and3solidstateratesensors;oneforeachaxiswhichactastheantennas

shorttermstabilizationreference.Afaultysensorinsidethelevelcagewillcausetheantennatolosestabilityand

mispointfromthesatelliteunderdynamicconditions.However,thesystemmayappeartobeoperationalintheport

whenthereisnomotiontocounteract.Thisdocumentwillrunthroughtestingthesensorsinsidethelevelcage,

replacingthelevelcageassemblyandcalibratingthesystemsremotetiltsetting.

4. VerifyRemoteTilt:

Ifthepedestalishavingstabilityproblems,firstly,checktheremotetiltsettingbylookingatthelevelbubbleontopof

thelevelcage(note:oldersystemsdidn’thaveabubbleinstalledontopofthelevelcage).Itisonlypossibletodoso

whenthevesselisstationary.Ifthebubbleisn’tasclosetocentralaspossible,theremotetiltsettingisn’tcorrectly

calibratedmeaningtheratesensorswon’tbecorrectlyalignedwiththeiraxis.Thiswillcausetheratesensorstooutput

incorrectfeedbackintothePCU’scontrolloop,potentiallycausingastabilizationissue.Calibratetheremotetiltsetting

aspertheinstructionsattheendofthisdocumentandcontinuetotestthelevelcageusingthefollowprocedures.

5. VerifyInitialization:

Powercyclethepedestal

1. Brakesrelease(ifapplicable)

2. Levelcagedrivestoitsendstopandthenbacksoffexactly45degrees.Elistrackedbasedonstepsissued

bytransistorsinthePCU.

3. Elevationaxisdrivesto45degreesbasedonfeedbackfromthelevelcagestiltsensor.

4. Crosslevelaxisdrivestolevel,againbasedonfeedbackfromthetiltsensor.

5. Unlimitedazimuthsystemsdriveclockwiseuntilthehallaffectsensor/switchseesthehomeflag(magnet

ornotch)ontheAZdrivepulley.

6. Limitedazimuthsystemsdriveclockwiseintotheend‐stopthendrivesCCWawayfromthestop.Ifa

6003A/6004system,theRELwouldatthispointbe580.0degrees.

Ifanyofthesestepsfail,ortheACUreportsmodel"xx03/xx97",theantennasN0parameterneedscalibrating.Once

entered,verifythattheparameterhassavedcorrectlytothePCU’sNVRAM.Amotordriveissueorpedestalerror

requiresfurthertroubleshooting.

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Procedure, Field Replacement, Level Cage Kit, Side Exit

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Document No

135265 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



6. VerifyStabilization:

Usingthebelowprocedurewewillphysicallymovethesystemsaxisunderstaticconditions,thusintroducinganerror

intothePCU’scontrolloop.Thiswillallowustoverifythatthesystemisabletoreturntoitslevelposition(stabilizeitself)

efficiently.WeareabletomonitorthesensoroutputsonDacRemPtoobservewhatishappening,orwecanjustwatch

thepedestalandobservehowitresponds.

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1. Turndishscanandtrackingoff.SelecttheDISP_VchartofDacRemP;youwillseethecurrentoutputfromthetilt

sensoringraphform.Oncearemotetilthasbeensetandwheninstableconditions,thetraceshouldbestableand

nomorethan+/‐4divisionsfromtheredreferenceline.Ifoutsidethislimitthenre‐checktheremotetiltandthenif

necessary,replaceandre‐calibratethelevelcage.

2. VerifyCrossLevelresponse:

Pushthecrosslevelbeamdowntotheleft(CCW)andholditinposition.VerifythattheCLtraceonDacRemP

movesdownanequalamounttothemovementexertedontheaxis.ReleasetheCLbeamandverifythatthe

DacRemPtracereturnsbacktoitsoriginalposition,withoutdeviatingortakingtimetosettle.Nowpushthecross

levelbeamdowntotherightandholditinposition.ThistimeverifythattheCLtraceonDacRemPmovesupan

equalamounttothemovementexertedontheaxis.ReleasetheAxisandverifytheDacRemPtraceandcrosslevel

beamreturnbacktotheiroriginalpositions,withoutdeviatingortakingtimetosettle.

3. VerifyLevel(Elevation)response:

PushthereflectorupinElevationandholditinposition.VerifythattheLVtraceonDacRemPmovesdownanequal

amounttothemovementexertedontheaxis.ReleasetheaxisandverifytheDacRemPtracereturns(orthe

systemsaxisreturns)backtoitsoriginalposition,withoutdeviatingortakingtimetosettle.Pushthereflectordown

inelevationandholditinposition.VerifythattheLVtraceonDacRemPmovesupanequalamounttothe

movementexertedontheaxis.ReleasetheaxisandverifytheDacRemPtracereturns(orthesystemsaxisreturns)

backtoitsoriginalposition,withoutdeviatingortakingtimetosettle.

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IfusingDacRemPthetraceshouldlooksimilartotheimagetotheleft.Notehowaftereachmovementthesystem

returnstoitslevelpositionefficientlywithouttakingtimetosettle.

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Procedure, Field Replacement, Level Cage Kit, Side Exit

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Document No

135265 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



7. RateSensorMonitoring:

RatesensoroutputscanalsobemonitoredusingtheDISP_WscreenofDacRemPtoverifyanydeviationsunderstatic

conditions.Thetracesshouldremainconsistent.Anydriftingorspikesareanindicationthesensorsvoltageoutputis

changingandthesensorisdefective(providednoforcesarebeingexertedonthesystem).Normaltraceis+/‐1division

fromredline.

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8. AzimuthTargeting:

Shouldtheantennahaveissuestargetinginazimuth,suchasnotaccuratelyfindingthesatelliteorrepeatedlyfindingthe

satelliteindifferentazimuthpositions,thenit’simportanttodiagnoseifthesystemismispointinginazimuthorrelative.

RelativefeedbackfromtheAZencodercanbeverifiedbyinitializingthesystem,verifyingitcalibratesitselfcorrectlyand

thendrivingthepedestalclockwisein90degreeincrementsovera360degreerotation.Makenotethatthesystem

pointscorrectly(bow,starboard,aft,port,bowandstarboard)andthatnoAZreferenceerrorisflaggedbythePCU.A

mechanicalproblemsuchasthebeltslippingonthepulleycouldalsocausethiskindoferror,ascouldsomeother

mechanicalissue.Skewingtheantennainazimuthbyholdingtherightorleftarrowkeytodrivetheantennaslowlymay

alsopresentanissue.

Ifthesystemkeepsfindingthesatelliteatdifferentazimuthpositionsbutatthesamerelative,theencoderisfunctioning

correctlyandoneofthereferenceinputs(Levelcage,gyro)tothePCUiscausingtheantennatomispoint.

9. Drift:

Anotherfailurewhichcanoccurisifaratesensorstartsdrifting;thismeansthesensorsvoltageoutputdeviatesfrom

whatthePCUisexpectingunderstablecondition(2.50VDC).Thisfaultwillintroduceanerrorintothecontrolloop.Itis

morecommontoseethisintheAzimuthaxisastheCLandELaxishavethetiltsensorastheirlongtermreference

(althoughshouldtheratesensorsdriftbelargeenoughtooverpowerthetiltsensoryouwouldseethesystemdriving

intooneoftheCLorELendstops).Thisismorenoticeablewithtrackingturnedoff.

ToverifyifthesystemisdriftinginAzimuth,firstturnofftrackingandthenmonitortherelativeposition.Understatic

conditions(thevesselsheadingisn’tchanging)therelativeshouldremainstill.Iftherelativevaluebeginsto

increase/decreasefromitsnominalpositionthentheazimuthratesensorisdrifting,creatinganerrorintothePCU’s

controlloop.ThiswillcausethePCUtobelievethevesselsheadingischangingandinturndrivetheazimuthaxisinthe

oppositedirectiontocompensate. 

Procedure, Field Replacement, Level Cage Kit, Side Exit

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Document No

135265 Rev B

Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



10. Diagnostics:

Anyincorrectreadingsfromtheabovetestswouldrelatetoanerrorintheantennascontrolloopcausingthesystemto

notstabilizecorrectly.Themostlikelycauseofthisisadefectivesensorinthelevelcage.Thenextstepwouldbeto

replaceandre‐calibratethelevelcage.Nowrepeatthefailedtesttoverifythatthesystemisnowfunctioningcorrectly.

Shouldtheproblemremain,anotherpossiblecausemaybeafaultwiththereferenceharnessbetweenthelevelcage

andPCU.ThePCUitselfshouldnotberuledoutasfaultyeither.Evenso,thelevelcageisthemostlikelycomponentto

becausingthisissue,thereforereplacingitisthefirststepwhentroubleshooting.

Oncetheproblemhasbeenrectified,itisgoodpracticetorefittheoriginallevelcageandseeifthefaultreturns.Itis

possiblethatcorrosiononthepinsofthereferenceharnessand/orconnectorsofthePCU/levelcagecausedtheinitial

fault.Byconnectingthereplacementlevelcage,itislikelythatanypincorrosionmayhaverubbedoff,creatingacleaner

electricalcontact.Youmayhavebeenundertheimpressionthatreplacingthelevelcagerectifiedthefaultwhenin

actualfact;theissuewasapoorelectricalcontactcausingvaryingresistance.

11. FurtherInformation:

Shouldthesystemfailtotargetthecorrectelevation(physicallypointingatadifferentpositiontothereadingonthe

DAC),orhaveissuesdrivingpastacertainelevationpositionthenthemostlikelycauseisadefectivelevelcagemotor.

Ifthesystemisdisplayingapedestalerror(error8),thereisadriveissuewiththeantennaandattentionwillneedtobe

paidtothemotorandmotordriver(servoamp)fortherelevantaxis.Thereisnoerrorcodethatdirectlytellsyouifthe

levelcageorlevelcagesteppermotorhasfailed,however,apointingorstabilizationissueisagoodindication.

Anotherpotentialissuewhichcouldcausetheantennatolosethesatelliteisifthevesselsgyrocompassisdrifting.This

accumulatingerroristhenfedintothecontrolloop.ThiscanbeverifiedbyrunningaDacRemPlogfileatseatomonitor

thepedestalsreadingswhentheAGCdrops,orbyputtingthesystemintosatellitereferencemodetouncouplethegyro

feedfromtheazimuthstabilizationloop.



Procedure, Field Replacement, Level Cage Kit, Side Exit

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consent of Sea Tel, Inc. 



12. ReplacingtheLevelCageAssembly:

12.1. Tools.



2mmFlatBlade(Terminal)Screwdriver

#1PhillipsScrewdriver

½”Wrench/Spanner



12.2. Procedure.

Procedureforreplacingthelevelcageassembly,SeaTelkitpartnumber:135344(levelcageassemblypartnumber:

122208‐1)andtensioningthelevelcagebelt.



*CAUTION:Powerdownthepedestalbeforefollowingthis

procedure.

1.Usinga2mmflatbladescrewdriver,loosenthescrews

securingthereferenceharnessD‐Subconnectortolevelcage.



2.Usinga#1Phillipsscrewdriver,loosenthefourscrews

attachinglevelcagemotortotheELpan(donotfully

remove).



3.Usinga½”socketorspanner,removetheNylocknut

securingthelevelcagetothespindle.



Procedure, Field Replacement, Level Cage Kit, Side Exit

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consent of Sea Tel, Inc. 

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4.Slidethemotortowardsthelevelcagetoallowenoughslack

onthebelttoremoveitwithoutstressingit.

5.Removethedefectivelevelcage,takingcarenottoremove

thestandoffspacerfromthespindle.



6.Installthereplacementlevelcageontothespindle,slipping

thebeltoverthelevelcagepulleyandmakingsureitsend

stopsarealignedcorrectly.

7.Secureitwiththe1/2”Nylocknut.Whentight(sothatthere

isnohorizontalplayalongthespindle)addanadditional½a

turnforagoodground.Rotatethelevelcagebyhandand

verifyithas90degreesofmotionandthatthecagerotates

freely,ensuringthestopsdonotrubagainsttheELpan.



8.Tensionthebeltbyslidingthemotorassemblybyhand

awayfromlevelcageandthentightenthefourscrews.



9.Acorrectlytensionedbeltwillallow¼turnwithyourfingers.

Ifthebelttensionistootight/looseadjustuntilcorrect.

10.Ifthebelttensionisincorrectloosenthescrewsandre‐

tension.NoLoctiteisrequiredaslockwashersareusedonthe

securingscrews.

11.Re‐connectthereferenceharnesstothelevelcageand

tightentheretainingscrews,againnoneedtouseLoctiteas

lockwashersareinstalledontheconnectorshell.





Procedure, Field Replacement, Level Cage Kit, Side Exit

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Page7of8

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Tel, Inc.. This document may not be reproduced or distributed in any form without prior written

consent of Sea Tel, Inc. 



13. CalibratingtheRemoteTiltSetting:

Thisprocedureisrequiredtocalibratethelevelcagesothatallthesensorswillbeaccuratelyalignedtotheiraxis.The

fluidfilledtiltsensorprovidesatwodimensionalhorizonreference.Thesystemisnotabletoautomaticallycalculatethe

exactcentervalue,thereforeitisnecessarytoperformthisproceduretomanuallyenteranyoffsetrequiredtomakesure

thePCUreceivesatruehorizonreference.



1. Turndishscanoff:

EnterintotheSetupMenubypressingandholdingthearrowstogetheruntiltheELTrimorAutoTrim

parameterisdisplayed.

Usethearrowkeytoscrollthroughthemenuuntilthedishscanwindowisdisplayed.

Pressthearrowtoactivatethewindowandthenpressthearrow,followedbythebuttontoturn

dishscanfromontooff.

*Note:Whenyoupressthearrowtoturndishscanoffyouwon’tseethedisplaychangeuntilyoupressthe

button.



(Steps2‐7requiresassistancetoobserveandoperateantennasimultaneously)



2. EnterintotheSetupMenubypressingandholdingthearrowstogetheruntiltheELTrimorAutoTrim

parameterisdisplayed.



3. PushthearrowkeyuntiltheRemoteTiltwindowisdisplayed.



4. PushthearrowkeytoactivatetheRemoteTiltsetting.



5. Usethearrowkeystopositionthebubbleasclosetothecenteraspossible.Eachpressofanarrowkeyonthe

directionalpadwillmovetheRemoteTilt½adegree.Itisadvisedthatyouonlypressthebuttononceandwaitfor

theaxistomovebeforepressingitagain.



Whenstandingbehindtheantennalookingatthebubble,ifthebubbleisovertotheright,youneedtopressthe

(right)arrowtobringthebubbleintothecenter.Ifthebubbleisdowntowardsyou,youneedtopressthe

(down)arrowtobringittowardsthecenter.Ifthebubbleistotheleft,youneedtopressthe(left)arrowandif

thebubbleisuptowardsthetop,youneedpressthe(up)arrowtomoveittowardsthecenter.



Procedure, Field Replacement, Level Cage Kit, Side Exit

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Page8of8

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consent of Sea Tel, Inc. 



Whencorrectthebubbleshouldbeasclosetothecenterofthefluidaspossible



6. WhenthebubbleisascentralaspossiblepressthebuttontodeactivatetheRemoteTiltsetting.



7. Turndishscanon:

EnterintotheSetupMenubypressingandholdingthearrowsuntileithertheELTrimorAutoTrim

parameterisdisplayed.

Usethearrowkeytoscrollthroughthemenuuntilthedishscanwindowisdisplayed.

Pressthearrowkeytoactivatethewindowandthenpressthearrowkey,followedbythebuttonto

turndishscanfromofftoon.

*Note:Whenyoupressthearrowtoturndishscanonyouwon’tseethedisplaychangeuntilyoupressthe

button.



8. SavetheRemoteTiltsettinginthePCU:

PressthearrowkeyuntiltheRemoteParameterswindowisdisplayed.

Pressthearrowkeytoactivatethewindowfollowedbythebutton(you’llseeaconfirmationonthe

displaysaying“Saved”).



9. AsgoodpracticemakeanoteofyourN4andN5parametersonceyouhavecorrectlysettheremotetilt.TheN4and

N5parametersareanumericreadoftheremotetilt.Todothisgototheremotecommandwindowandkeyin

N4999toreadtheCLsetting,followedbyN5999toreadtheELsetting.



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