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.

You need a suitable screwdriver or a large coin to open the Motor Control Unit cabinet. You also need a 4 mm Allen key.

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.

Note:

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.

  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. Lowering the transducer:
    1. 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.

    2. Locate the Motor Protecting Switch (S301).
    3. Deactivate the Motor Protecting Switch (S301) by pressing the operating handle to OFF.
    4. Locate the hand crank inside the Motor Control Unit.
    5. Remove the hand crank from its storage position.
    6. Remove the plastic plug on the top cover of the hull unit.
    7. Mount the hand crank onto the stub shaft through the hole in the top cover.
    8. Locate the brake release screw on the motor.
    9. Use an 4 mm Allen key to rotate the screw clockwise until the motor brake is released.
    10. Turn the crank until the transducer is fully lowered.
  4. Hoisting the transducer:
    1. Mount the hand crank onto the stub shaft through the hole in the top cover.
    2. Turn the crank until the transducer is fully retracted.
    3. Loosen the brake release screw to engage the motor brake.
    4. Check with the hand crank to ensure that the motor brake is engaged.
    5. Remove the hand crank from the stub shaft, and mount it in its storage position in the Motor Control Unit.
    6. Activate the Motor Protecting Switch (S301) by pressing the operating handle to ON.
    7. Make sure that the Hoist/Lower Switch is set to REMOTE.
      Note:

      For normal operation from the Operating Panel, the switch must be set to REMOTE.

    8. Close the door on the Motor Control Unit.
  5. Insert the mains fuses for the hull unit.