Kongsberg Simrad SN90 Reference Manual page 39

Purse seine and trawling sonar

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A hull unit may be provided as an option. It allows you to lower and hoist the

transducer. All information and tasks related to the hull unit may be disregarded

and omitted if the SN90 system is installed without this unit.

Press this button to turn the SN90 system on and off.

Before you turn on the SN90 system, make sure that you have sufficient water

depth to lower the transducer!

You must never turn on the SN90 system when the ship is in dry dock. The

transducer can be damaged if it transmits in the open air.

You must never turn off the SN90 system by means of the on/off switch on

the Processor Unit. You must ALWAYS use the Operating Panel or select

While the transducer is moving the indicator lamp flashes, and an audible

signal is sounded. When the requested position has been reached, the

indicator lamp is lit, and the audible signal stops.

If you have the large hull unit you can define two middle positions. The

button can only be used to lower or hoist the transducer to the initial

on the top bar.

to hoist the transducer to its upper position.

to place the transducer in a predefined middle position.

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