Simrad ST90 - Defining the Installation Parameters for the Motion Reference Unit (MRU)

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442703/B
Result
Requirements
Results
Theoffsetangleisdened.
Theoffsetvalueisrecorded.
Offsetvalue:
Dateandsignature:
Deningtheinstallationparametersforthemotionreference
unit(MRU)
Thephysicallocationofthemotionreferenceunit(MRU)relativetothetransduceris
requiredtoallowtheST90toadjustforrollandpitchasaccuratelyaspossible.Thistask
isonlyapplicableisyouareusinganexternalmotionreferenceunitonyourST90.
Prerequisites
TheST90isinstalledasspeciedinthismanual.
•TheST90isturnedon,anditisworkingnormally.
•TheST90isinNormalmode,butTXPowerissettoOfftopreventtransmission.
•Thetransducerisretractedtoitsupperposition.
•Thevesselisberthedoratsea.
Neithertoolsnorinstrumentsarerequired.
Caution
YoumustneversettheST90to"ping"unlessthetransducerissubmergedinwater.
Thetransducermaybedamagedifittransmitsinopenair.
Foraccuratelocationofthemotionreferenceunit(MRU),youneedthedetailedvessel
drawings.Theinformationabouttheinstallationanglesmustberetrievedfromthe
reportsprovidedbythepersonnelthatinstalledtheequipment.
Context
Theinformationfromamotionreferenceunit(MRU)(normallyheave,rollandpitch
information)isimportedintotheST90toincreasetheaccuracyoftheechodata.The
ST90isprovidedwithabuilt-inmotionsensor.ItisplacedinsidetheMotorControl
Unit.Forimprovedoperationalaccuracy,anexternalmotionreferenceunit(MRU)may
beused.Themotionreferenceunit(MRU)measurestherollandpitchmotionsofthe
vessel.Somesensormodelsalsomeasureheave.
OntheMRUpage,youmustdenethephysicallocationofthemotionreferenceunit
relatedtothereferencepointyoucreatedontheShippage.TherotationaroundtheX,Y
andZaxisisusedtocompensateformisalignmentsmadeduringthephysicalinstallation
SimradST90InstallationManual