Kongsberg Simrad ST90, Reference Manual

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Lowering and hoisting the transducer from the user interface
The Operating Panel controls the lowering and hoisting of the transducer. Dedicated buttons
are provided for the physical transducer locations. You can also control the transducer
movements from the top bar.
Context
The
Hull Unit Control
dialog box allows you to lower
and hoist the transducer. The dialog box also provides
status information about the transducer position. You can
monitor the current position of the transducer, and make
changes to the position defaults.
Caution
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 through the top of the shaft.
If you suspect that the transducer shaft is seriously damaged with holes, do not retract the
transducer to its upper position. To prevent serious damage to the vessel or the vessel
stability, you must have a water pump and a warning system in the sonar room.
Procedure
1 Make sure that you have sufficient water depth below the keel before you lower the
transducer.
2 Select
Hull Unit
on the top bar to open the
Hull Unit Control
dialog box.
3 To lower the transducer select
Down
.
4 To hoist the transducer select
Up
.
5 To move the transducer to its predefined middle position, select
Middle
.
Retracting the transducer to a middle position may be useful if you use the ST90 system
simultaneously with other sonars. A higher position will permit you to increase the
vessel speed. If you operate in very shallow waters, you may also reduce the risk
of hitting bottom. However, placing the transducer immediately under the hull may
increase the flow noise.
Simrad ST90 Reference Manual