Propagation characteristics of a DC biased line for hydraulic-crane PLC

In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. In this paper, an over-winding detection circuit, which has been used commonly in hydraulic cranes, has been proposed to used as a PLC channel to realize a high speed network infrastructure between cab and boom-tip. The throughput performances of two types of cranes, truck-mounted crane and rough terrain crane, were measured by using HD-PLC adapters. It was shown that the best throughput value of 70Mbps was achieved when the proposing system of voltage-drive at the cab and current-reception at the tip was used. From the viewpoint of the transfer function and line impedance properties, the measured throughput performances have been evaluated.