Simrad ST90 - Hull Unit Description

442703/B
27
Hullunitdescription
ThehullunitprovidedwiththeST90isdesignedtolowerthetransducerdownbelowthe
ship’shullwhentheST90shallbeused.WhentheST90isswitchedoff,thetransducer
ishoistedforprotection.
TheST90Fishndingsonarcanbeprovidedwithoneofthefollowinghullunits.
HullUnit
Partnumber
Loweringdepth
Transducercable
Maximumspeed
4414864.6m ST92
441488
1.2m
7m
21knots
4385204.6m ST93
441490
1.6m
7m
16knots
4414924.6m ST94
441494
2.1m
7m
11knots
Outlinedimensionsdrawings:
-ST92:447567
-ST93:435546
-ST94:447545
Thesametransducerisusedonallhullunittypes.Thesameinstallationtrunkisusedon
allhullunittypes.
Note
OntheST94HullUnit,thetransducerisautomaticallyhoistedto1.6metreswhenvessel
speedexceeds11knots.
Thehullunitisalargemechanicalconstruction.Itismountedonthetopofthe
installationtrunk.Theinstallationtrunkpenetratestheship’shull,andallowsthe
transducertobeloweredintothesea.Thehullunitisnormallylocatedintheforward
partofthevessel.Thislocationisrecommendedtoavoidthenoisefromthepropellers
andtheengine.
ThepurposeoftheMotorControlUnitistocontrolthehoistingmotoronthehullunit.
WhenyoumaketheappropriatecommandsontheST90sonar,theMotorControlUnit
willstartandstopthemotor.Itwillalsomakesurethatthemotorrotatesthecorrectway.
Themotionsensorforthebuilt-inelectronicstabilizationofthesonarbeamsisprovided.
•Tolowerthetransducer,pressDownontheOperatingPanel.Toindicatetransducer
movement,theDownindicatorlampashes,andanaudiblesignalissounded.When
thebottompositionhasbeenreached,theindicatorlampislit,andtheaudiblesignal
stops.
•Toretractthetransducer,pressUpontheOperatingPanel.
Thetransducercanalsobeloweredtoanyselectedmiddleposition.OntheOperating
Panel,pressMiddle.Incaseofpowerfailure,thetransducercanberaisedorlowered
manuallybymeansofahandcrank.
SimradST90