Communication system for a crane installation

摘要

The invention relates to a communication system for a crane installation in a container yard. The crane installation comprises a crane path several hundred metres in length on which a crane is movably disposed. A crane installation of this type requires a plurality of communication channels between the fixed installation part and the crane. According to the invention, a dedicated loop system is provided for communication and powerline carrier (PLC) units are provided for converting the AF channels to carrier-frequency transmission mode. In order to prevent high contact resistances on the loop contacts, the loop system is also used to supply power to the PLC unit located on the crane. The PLC unit in the fixed installation part is connected to the start of the loop system. Thus, the piece of the loop system from the loop contacts to its end acts as a spur. The invention also discloses how the development of waves which interfere with communication on the spur is prevented.