The MagneTek GPD 505V‑A017 is a 5 HP, 230 VAC, three‑phase variable‑frequency AC drive that uses pulse‑width modulation for speed control of squirrel‑cage induction motors. Common failure modes include overheating or failure of the IGBT module (often due to thermal overload), insulation breakdown in the power winding, and degradation of the DC link capacitors leading to ripple and over‑voltage conditions. Initial diagnostics should verify that the 230 VAC input is within spec and that the output current does not exceed 17.5 A; check for any visible signs of burn or component discoloration on the IGBT board and inspect the DC link capacitor voltage for excessive ripple. Finally, review the drive’s diagnostic registers (if accessible) for fault codes related to over‑temperature, short‑to‑ground, or undervoltage protection.[oss-gpt-20b]