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Engineering design, software development and commissioning was provided for a ship loading system at  the port of  Dublin. The bridge structure was raised and lowered utilising 6 variable speed AC driven  winches to automatically  provide the correct height above sea level. The bridge deck separation was  controlled via Hydraulic rams. The top  deck also had a telescopic section that traversed out using two  motors per side engaged into a rack and pinion. These  drives maintain their position to within 1 mm of  each other. They also control a locking mechanism using accurate  detection of the rack relative to a sprag  unit. The drive system is a fully redundant distributed control system utilising  Control Techniques  Unidrives and CTNet communication.

An Allen Bradley SLC500 PLC with remote I/O provides general operational control with a Panel View 1000  providing a graphical operator interface, all communicating via DeviceNet communications. Communication  with the drive system for status and control is via Modbus RTU.

Drives and Automation Ltd
21 Staveley Hall
Staveley Hall Drive
Chesterfield S43 3TN

Contact us...
t:  0845 370 4660
f:  0845 680 0362

page updated on 01/05/2015