The Vigoservo ARS 135‑25 is a 2.5 kW AC servo drive rated for 200–230 V, 50/60 Hz, commonly used to control high‑torque motors in industrial automation. Typical failure modes for this class of drives include power supply overvoltage or ripple causing insulation breakdown, overheating of the motor driver ICs, and loss of communication with the host controller due to faulty I/O modules or degraded signal cables. Initial troubleshooting should verify that the input voltage is within spec and free of excess ripple, inspect all heat sinks and ventilation for proper cooling, and check the drive’s diagnostic LEDs or error registers for fault codes; also confirm that all control signals (PWM, position, velocity) are present and clean on a scope before proceeding to component replacement.[oss-gpt-20b]