The KEB 09.F0.200‑1278 is a 2.8 kVA, 200–240 VAC single‑phase Combivert inverter controller designed for industrial automation and servo drive applications. Common failure modes reported for this model include overheating of the internal power MOSFETs due to inadequate external cooling, insulation breakdown in the input/output modules, and firmware corruption leading to “commutation error” or “over‑current lockout” messages. Initial diagnostics should verify that the cabinet’s external fan is operating and that ambient temperature remains below 50 °C; check the main power supply for correct voltage and ripple, inspect all I/O connections for loose terminals or corrosion, and review any stored fault codes via the controller’s diagnostic interface.[oss-gpt-20b]