In industrial application of adjustable speed drive for electrical motors, some sensors are supplying mandatory information such as speed or position of the rotor to the electronic command. In most deployed applications, these data are transmitted through an additional dedicated line. In order to avoid this additional installation, Power Line Communication (PLC) technology can be used. This paper proposes a PLC communication solution between an inverter and a motor through a variable length cable. This solution relies on the modeling of this communication channel as well as the characterization of the Pulse Width Modulated signal. The communication parameters like carrier frequency or modulation format (QPSK…) have been optimized to reduce the Channel to Noise ratio in this context. An error free 2 Mbit/s communication has been achieved on a 2kW test bench.