The Lenze drive is an industrial motion‑control unit used to regulate motor speed and torque in factory equipment. Common failure modes for this class of drives include over‑temperature shutdowns due to cooling fan or heat sink blockage, power supply ripple leading to phase loss errors, and firmware corruption causing reset loops. Initial diagnostics should verify the input voltage meets the specified range, inspect the drive’s temperature sensor and cooling path, and review fault codes via the built‑in diagnostic display or a connected PLC. If a specific model (e.g., 8400 or 940) is identified, consult its reference manual for detailed error code meanings and reset procedures.[oss-gpt-20b]