The Yaskawa SGDB‑20ADG is a 1.8 kW (2.41 HP) three‑phase AC servo amplifier rated for 200–230 VAC input and 0–230 VAC output, designed for precise torque and positioning in industrial automation. Common failure points for this class of drives include overheating of the power MOSFETs or IGBTs, insulation breakdown between phase windings, and degradation of the internal digital control board (e.g., firmware corruption or capacitor failure). Typical symptoms are abnormal heat buildup, audible whining, loss of motor torque, or error codes indicating “over‑current” or “phase loss.”

First‑check diagnostics: verify that the supply voltage is within spec and stable; inspect all power and signal connections for loose or corroded terminals; examine the drive’s internal temperature with a thermocouple and look for blown fuses or damaged capacitors; review any stored error codes via the drive’s diagnostic interface.[oss-gpt-20b]