Simrad SC90, Installation Manual

Page: 297 / 544

419050/B
295
Checking the transducer lowering and hoisting functionality
During normal operation, the transducer is lowered and hoisted from the Operating
Panel. During this functional test, however, the operation is controlled from the Motor
Control Unit.
Prerequisites
Before you can do this task, the
following prerequisites must be met:
• The SC90 is turned off.
• The circuit breaker for the 3-phase
AC power is closed. AC power
is connected.
• The transducer is in its upper
position with the
Upper Limit
Switch
(S304) activated.
You must be equipped with a
standard set of tools. This tool set
must comprise the normal tools for
electronic and electromechanical
tasks. Each tool must be provided
in various sizes. We recommend that
all tools are demagnetized to protect
your equipment.
Context
This task serves two purposes.
• You will verify that the transducer can be lowered and hoisted with local control.
• You will find the best way to secure the transducer cable so that it moves freely during
lowering and hoisting.
WARNING
High voltages are used. This equipment must only be serviced by qualified
personnel familiar with high-voltage equipment and the potential hazards
involved. Failure to observe this precaution could result in bodily injury.
Procedure
1 Make sure that the water depth under the keel permits you to lower the transducer.
2 Locate the hand crank inside the Motor Control Unit. Remove the hand crank
from its storage position.
3 Locate the
Motor Protecting Switch
(S301). Press the operating handle upwards to
position ON .
Setting to work