Kongsberg Simrad MF90, Installation Manual

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476671/B
If you forget to hoist the transducer before the MF90 system is turned off, the transducer
is hoisted automatically before the power is disconnected. The transducer is also hoisted
automatically if a serious malfunction occurs to the communication between the bridge
and the hull unit.
In the event of improper operation, the powerful electric motor on the hull unit may cause
serious damage to the equipment and/or injury to personnel. Therefore, before you start
manual operation, read carefully through the relevant operating procedures. You must
familiarize yourself with the correct handling methods and the relevant safety requirements.
The MF90 system can be provided with one of the following hull units:
Hull Unit Lowering depth (m) Transducer cables (m) Maximum speed
(knots)
4.6 MF90 1.0
10
20
4.6 MF94 2.1
7
19
On some vessels, additional transducer protection is required. One example is vessels
working in arctic conditions. It is important for them to prevent ice from damaging the
transducer. A gate valve is then added to the hull unit installation. By means of a mechanical
construction it shuts off the bottom of the installation trunk when the MF90 system is not
used.
For more information, refer to the end-user documentation provided by the manufacturer.
Important
The hull unit gantry must be secured to the bulkhead by means of mechanical support
brackets. The dimensions and strength of the support brackets must be adequate to prevent
vortex induced vibrations. This is an invariable requirement to ensure the safety of the
MF90 system and the vessel.
We recommend that support brackets are placed pointing at minimum three directions with
approximately 120 degrees between them.
The mechanical support brackets must be designed and manufactured by the installation
shipyard to fit the complete installation in the sonar room. All calculations made to support
the design must meet the applicable safety requirements, and apply to the physical properties
of the complete installation.
Simrad MF90 Installation Manual