Installation manual

System familiarization

850--160137 / A

2.4 Hull Unit

TheSD570HullUnitisdesignedtobelowered1.0meterbelow

the ship’s hull at a maximum ship’s speed of 15 knots. The

transducer can also be loweredto a middleposition whereonly

the transducer face is outside the sonar trunk.

In addition to the solid construction of the hoisting/lowering

mechanism, the SD 570 Hull Unit comprises the following

main components:

· Raising/lowering motor

· Motor control unit

· Multi--element transducer

ThemotorontheHullUnitisathree--phasemotor,andituses

less than 25 seconds for raising and lowering the transducer.

Note, that in case of voltage failure, the Hull Unit can be

manually raised or lowered by a hand crank.

The motor control unit which is mounted on the HullUnit,

contains the control electronics for the raising/lowering motor.

The optionalsensor fortheelectronicstabilization of the sonar

beams is also housed in the motor control unit.

The transducer has a diameter of 20 cm, and contains 256

separate transducer elements. This provides unlimited

electronic control of the sonar beams in any direction around

and below the vessel.

WARNING ! If the transducer hits larger objects or bottom, thetransducer

shaft may be bent, or in worst case it can be broken off. A

broken transducer shaft will cause water leakage in the top of

theshaft.Topreventlargerleakagesinsuchacase,donotraise

the transducer shaft to the upper position. To prevent serious

damages it is therefore of great importance to have a good

pump and warning system in the sonar room.