Simrad SD570, Operator'S Manual

Page: 19 / 128

System familiarization
7
850--160137 / A
2.4 Hull Unit
The SD 570 Hull Unit is designed to be lowered 1.0 meter below
the ship’s hull at a maximum ship’s speed of 15 knots. The
transducer can also be lowered to a middle position where only
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
The motor on the Hull Unit is a three--phase motor, and it uses
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 Hull Unit,
contains the control electronics for the raising/lowering motor.
The optional sensor for the electronic stabilization 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, the transducer
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
the shaft. To prevent larger leakages in such a case, do not raise
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.