The Berges CO‑Sinus‑ACI Serve Drive/PLC is a 3‑phase AC servo drive and programmable logic controller designed for high‑power industrial motion control (typically up to 15 kW). Common failure points in this class include power supply modules (overvoltage, phase loss), I/O interface boards (corrosion or solder joint fatigue), and the main control board’s microcontroller/FPGA (software corruption or firmware lockup). Initial checks should verify that the unit receives correct line voltage and phase balance, inspect all connectors for loose or corroded contacts, and review any diagnostic error codes displayed on the panel or via RS‑232/Modbus communication. If power and wiring are clean, perform a visual inspection of the main board for burnt components or damaged traces before proceeding to component replacement or firmware reflash.[oss-gpt-20b]