Simrad SN90, Operator'S Manual

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128
381295/B
Lowering and hoisting the transducer using the hand crank
The Operating Panel controls the lowering and hoisting of the transducer. In case of a
power failure the transducer can be hoisted or lowered manually by means of a hand
crank.
Prerequisites
You need a suitable screwdriver
or a large coin to open the
Motor Control Unit cabinet.
You also need a 4 mm Allen
key.
Context
On larger hull units, the hoist
motor is provided with a motor
brake. The motor brake must be
released before the transducer
is manually lowered or hoisted.
Important
When not in use, the hand
crank must always be placed
inside the Motor Control Unit.
When removed from its storage
position the hand crank releases
a safety switch which disables
hull unit operation..
Procedure
1 Make sure that you have sufficient water depth below the keel before you lower
the transducer.
If your vessel is in dry dock, make sure that you have sufficient height between
the hull and the dry dock floor. The space under the hull must be free from tools,
scaffolding, personnel and other obstacles.
2 Remove the mains fuses for the hull unit.
3 Open the cabinet door.
4 Locate the
Motor Protecting Switch
(S301).
5 Deactivate the
Motor Protecting Switch
(S301) by pressing the operating handle
to OFF .
6 Lowering the transducer
a Locate the hand crank inside the Motor Control Unit.
Simrad SN90 Operator Manual