Modernization of cable supply system of cable-laying vessel

Abstract

The article considers the methods of upgrading the system of cable supply from the vessel. The system controls operation of the electric motor, through which the cable is unwound from the reel, and regulates the position of the guide which delivers the cable into the water. The need to create an automatic system for laying cable from a ship, which will provide the minimal deformation and minimal cable consumption, is proved. The first system is designed to control the speed of the electric motor that unwinds the cable from the reel. Adjustment is carried out due to the signal from the tension sensor (current signal is 4 - 20 mA). The signal goes to the programmable logic controller. The analog output signal from the controller (the current signal also ranges within 4 - 20 mA) is fed to the frequency converter, which, in turn, changes the rotation speed of the electric motor in accordance with the prescribed program. The second system is designed to change the position of the guide delivering the cable overboard. The proposed system compensates for the change in the position of the cable in the water under the influence of the current. The adjustment is made depending on the signal from the angle change sensor, which will go to the programmable logic controller. The first system is considered in detail, its electrical circuit diagram and electrical functional diagram are presented, as well as other elements of the system (sensor, programmable logic controller). A description of the circuit operation is given