Kongsberg Simrad ST90, Reference Manual

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218
442704/A
Inserting the installation parameters for the transducer
When the installation trunk is mounted, it may not be positioned with the mounting holes
perfectly aligned to the centre line of the vessel. When the hull unit is placed on the trunk,
the "forward" mark on the transducer shaft sleeve - and thus also "forward" on the transducer
- may not point forward at all, but several degrees off the centre line. To obtain accurate echo
presentations, this misalignment must be adjusted by changing the installation parameters.
Prerequisites
Illustration:
A Bow
B
This is the alignment angle (±180°)
C
0° transducer mark
The ST90 system has been set up with
its hardware units connected as specified
in the
Installation Manual .
• The ST90 system is turned on and
operates normally.
• The ST90 system is in Normal mode,
but
TX Power
is set to Off to prevent
transmissions.
• The vessel is berthed or at sea.
• Neither tools nor instruments are
required.
For accurate location of the transducer,
you need the detailed vessel drawings.
You also need the installation angles that
were recorded when the transducer was installed.
Context
As a general recommendation, the hull unit shall be oriented with the hoisting motor
pointing aft. If this orientation makes it difficult to access electrical connections, the hull
unit may be rotated during its installation to the most suitable direction. Independent of the
hull unit orientation, the alignment is always defined as:
The angle measured from the bow to the 0° transducer mark.
The 0° transducer mark is located outermost on the mounting flange, and it is marked as
a red "0". Depending on the transducer mounting, it can be located at any angle on the
mounting flange, not necessarily as shown in the illustration.
Simrad ST90 Reference Manual