10 Years of Repairing Air Compressors: The Little-Known "Golden Rules" I Only Dare to Share Now(Part 4）

Long-term voltage below 370V or above 410V (three-phase power) causes abnormal current in motor windings, tripling the burnout risk within 3 years. A textile factory replaced 4 motors in 3 years due to ignoring voltage issues, losing over ¥200,000.​

Low-Cost Solution：Install a reactor at the inverter input (cost ~¥2000) to suppress voltage surges and reduce motor failure risk by 30%. Monthly voltage testing at power terminals is mandatory.