Kongsberg Simrad SN90 Reference Manual page 291

Purse seine and trawling sonar
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that neither this coating nor the internal parts of the transducer are damaged during
the handling, installation or cleaning. Any holes and/or scratches in the transducer
surface will allow water to penetrate the transducer. If a leak occurs, the transducer
must be replaced.
Note
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.
Procedure
1
Make sure that the SN90
system is turned off.
2
Make sure that you have
sufficient height between
the hull and the dry dock
floor.
3
Lowering the transducer
a
Use a spanner to
open the door on the
Motor Control Unit.
WARNING
High voltages are used. This equipment must be serviced only by
qualified personnel familiar with high-voltage equipment and the
potential hazards involved. Failure to observe this precaution could
result in bodily injury. You may be exposed to electric shock. Read and
understand the applicable first aid instructions related to electric shock.
b
Locate the
c
Deactivate the
to OFF.
381294/E
Motor Protecting Switch
Motor Protecting Switch
Maintenance procedures
(S301).
(S301) by pressing the operating handle
289

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