Emergency lowering and hoisting using the two contactors

In case of emergency it is possible to bypass the control logic in the Motor Control Unit. You can control the hoisting motor directly using the two designated contactors.

You need a suitable screwdriver or a large coin to open the Motor Control Unit cabinet. You also need a small screwdriver. 3-phase voltage for the hoisting motor is available.

The two contactors are identified as K301 and K302. The Hoisting Contactor (K301) and the Lowering Contactor (K302) are located on the upper DIN rail in the Motor Control Unit.

  • Left side: When activated, the Hoisting Contactor (K301) starts the motor in order to hoist the transducer.
  • Right side: The Lowering Contactor (K302) starts the motor to lower the transducer.
Warning:

This operation overrides the upper and lower limit switches. The contactors must be released before the transducer reaches upper or lower position. Failure to do so may result in serious mechanical damage to the hull unit.

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. Open the cabinet door.
    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.

  3. Locate the Hoist/Lower Switch (S302). Set the switch to position STOP.

    This is for safety reasons.

  4. Lowering the transducer:
    1. Locate the Lowering Contactor (K302) on the right side.
    2. Open the transparent plastic cover on the front of the contactor.
    3. Use a small screw driver, and press the spring return actuator to apply voltage to the motor.
    4. Lower the transducer and STOP before you reach the bottom position.
  5. Hoisting the transducer:
    1. Locate the Hoisting Contactor (K301) on the left side.
    2. Open the transparent plastic cover on the front of the contactor.
    3. Use a small screw driver, and press the spring return actuator to apply voltage to the motor.
    4. Hoist the transducer and STOP before you reach the upper position.
  6. Locate the Hoist/Lower Switch (S302). Set the switch to position REMOTE.
    Note:

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

  7. Close the cabinet door.