Kongsberg Simrad SN90, Installation Manual

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68
381298/C
(CD010205_090_001)
+Z
V
+Z
V
+Y
V
+Y
V
This illustration shows the vessel from the bow looking aft. Observe the Z and Y axis.
A Installation angle around the Y-axis
B
Steel conduit terminated above the water line (relevant for "dry" and "wet" conduit
installations)
Physical installation angles
For purse seiners, the transducer must be pointed slightly downwards, and towards the
fishing gear. Typical installation angles on previous vessels have been:
• Rotation around the Y-axis: 75 to 80 degrees
• Rotation around the Z-axis: 70 to 80 degrees
When you decide on rotation around the Y-axis, consider the tilt range offered by the
SN90: +10 to -90° in 1° steps. Make sure that the physical installation angle does not
allow the hull to create a shadow for the SN90 beams when minimum tilt is chosen in
the user interface.
Note
Keep in mind the default "start location" of the transducer; all rotation angles set to 0
(zero) means that the transducer face is horizontal pointing straight down with the
orientation mark (arrow) pointing forward. Lifting the transducer to the requested angle
will always require a positive rotation around the Y-axis.
Turning the transducer to face the gear on a purse seiner will always require a positive
(or negative) rotation around the Z-axis. A positive Z-axis value will turn the transducer
towards port, while a negative value will turn it towards starboard.
You will only need to adjust the rotation around the X-axis if the transducer is mounted
with the orientation mark (arrow) pointing in the wrong direction, or if it necessary
to adjust for an inaccurate installation.
Simrad SN90