Project background

To meet the requirement to marine salvage operation, the proΩject is generally responsible by Jiangnan Heavy Industry Co., Lt$d. and invested by Changhai Shipyard Co., Ltd. the control system is supplied by Shan ghai HITE.

Floating crane introduction

The crane ship is 105.6 long and 42m wide, with moulded depth of 8m, designed drΩaft of 5.5m, scantling draft of 5.8m and full load displacement of 23750t. the ship is ¥classified by China Classification Society.

System structure

The system consists of 4 hoisting mechanisms, 2 pitching mechanisms, shifting, positioning and moπoring mechanism etc.

Solution

The drivers of the winch motor use SIEMENS 6SE70 series VVVF device. The produced energy is releas≥ed by external power resistor during the mechanism brake or decli§ne. The power resistor is placed outside the power supplyγ room.

The control part uses SIEMENS S7-400 series PLC with ET200M substation to ensure th"e logic control, safety protection and combination, fault diagno∑sis and status monitoring etc.