ELAC LAZ 5200 – Operating Instructions
Installation
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Wärtsilä ELAC Nautik GmbH
TH 52 614 8001 EN Rev. A 09/2018
R
efer to pr
otection
notice ISO 16016
4.2.2
General Information on Transducer Installation
The system operates acoustically. Acoustic noise in the vicinity of the transducers reduc-
es the sensitivity and performance of the system.
The following list of frequent sources of interference can serve as a guide for finding the
ideal installation location in the form of the best compromise between different sources:
•
Air bubbles under the transducer:
– Air bubbles mean additional noise and are very strong acoustic reflectors. Bub-
bles can be generated by flow dynamic processes under the ship by the bow wave
or the bow thruster, or they are trapped under the ship. The location chosen for
the transducer must ensure that air bubbles are avoided.
•
Turbulent water flows:
– A turbulent water flow can occur for various reasons. In order to reduce noise in
the system caused by turbulence, the area in front of the transducers must be
smooth and free of obstacles. This applies e.g. to protruding parts such as zinc
anodes, safety straps, sonar expansion units or anchor openings.
•
Structure-borne noise:
– All machinery running inside the ship generates structure-borne noise. If this noise
finds its way to the transducer, the receiver may be flooded. Heavy machinery
should not be operated in the immediate vicinity of the transducers. This includes
i.a. generators, pumps, separators and motors.
•
Bow thruster:
– During operation, a bow thruster often generates so much noise and so many bub-
bles that echo sounder operation is no longer possible. On ships with bow thruster,
transducers must be installed ahead of the bow thruster.
•
Bulbous bow
– A bulbous bow generates a large number of air bubbles that hinder echo sounder
operation. On ships with bulbous bow, transducers must be installed as far for-
ward as possible.
•
Other sonars or echo sounders
– To avoid mutual interferences, it must be ensured during installation and configu-
ration (in particular during transducer selection) that no other sonars or echo
sounders use the frequencies of the
Navigation Echo Sounder ELAC LAZ 5200
.
4.2.3
Earthing
Components must be earthed to satisfy the EMC requirements and to protect the person-
nel from electric shocks.
Each unit has an earthing terminal marked with the earth symbol. Refer to the dimension-
al drawing for the location of this earthing terminal.
Each unit must have an electrically conductive connection to the ship’s earth by the short-
est route using a cable with a minimum diameter of 6 mm
2
. This connection must ensure
a uniform and good connection at all times.
Make the earth connection as follows:
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