The Lust VF1402S is a 3‑phase AC frequency converter/drive rated at 1.9 A (≈0.75 kW) and part of the VF1000 series, designed to control motor speed and torque in industrial applications. Common failure points for this class include over‑temperature shutdowns due to inadequate cooling or fan failure, insulation breakdown between stator windings and chassis, and protection circuit trips from overload or short‑circuit events; the drive’s internal power MOSFET array is also susceptible to thermal runaway if the heat sink is compromised. First‑check diagnostics should verify that the 460 V input supply is within spec and stable, inspect the cooling fan and heatsink for dust or mechanical damage, and review any fault codes displayed on the drive’s panel (e.g., “F1” for over‑temperature, “F2” for overload). If no error code appears, perform a visual inspection of the PCB for burnt components or cracked traces before proceeding to component testing.[oss-gpt-20b]