Kongsberg Simrad SN90 Reference Manual page 222

Simrad SN90 Reference Manual
Used for purse seine with the gear on the port side, the transducer must be pointed
approximately -90 degrees towards port (or 270 degrees towards starboard which
puts you in the same direction) with the indicator arrow pointing up. To set
the angles correctly, observe this exercise. Use your cellphone to visualize the
transducer movements.
1 Start with the transducer in its default position: The transducer face is
horizontal facing down, and the indicator arrow is pointing straight forward.
2 If the transducer is properly installed without unintentional skew, the
Around X
3 Lift the front end of the transducer up, so that the indicator arrow moves up.
4 Proceed until the requested angle has been reached.
Example: If a 20-degree Y angle is requested, the
set to 70 degrees (that is the angle from the default position).
5 From this raised position, turn the transducer towards port. The indicator
arrow is still pointing up. This is a Rotation Around Z.
6 Proceed until the requested angle has been reached.
Example: If a -100-degree Z angle is requested, the
be set to -100 degrees (that is the angle from the forward position). Setting it
to +260 degrees will also work.
With hull unit
A hull unit may be provided as an option. It allows you to lower and hoist the
transducer. When this option is selected, the transducer is delivered readily
mounted at the lower end of the transducer shaft. Since the transducer is pointing
straight forward, the
has been installed with an unintentional rotation referred to the centre line, the
Rotation Around Z
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.
On the
Transducer
• If the 0° transducer mark points to the starboard (right) side of the vessel's
centre line, insert the alignment as a number between 0 and +180 degrees.
• If the 0° transducer mark points to the port (left) side of the vessel's centre
line (as shown in the illustration), insert the alignment as a number between 0
and –180 degrees.
220
can also be set to 0 (zero).
Rotation Around Z
must be adjusted to compensate for this.
page, define this angle as rotation around Z.
Rotation Around Y
Rotation Around Z
value is 0 (zero). However, if the hull unit
Rotation
must be
must
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