Fault detection system with leakage current detection

摘要

A fault detection system for a asphalt paving machine screed with conducting heater elements insulated from a frame ground powered by a high voltage DC power source such as a switched reluctance generator and inverter. The elements are arrangement in electrically parallel zones connected by switching. One low voltage power source LV1 is connected to the positive and negative bus to measure resistance to leakage current in power supply modules. A second low voltage power source LV2 may be selectively connected to each heater zone on either bus in order to find faulted zones or elements