The Teijin Seiki ARS135‑25 is a 2.5 kW VIGO‑SERVO AC servo drive rated for 200–230 VAC, commonly used to power industrial servo motors in motion control loops. Typical failure modes for this class of drives include overheating or tripping of the internal thermal protection, loss of communication with the host controller (e.g., RS‑232/RS‑485), and degradation of input/output relays or contactors due to electrical surges. First‑check diagnostics: verify that the 200–230 VAC supply is within spec and that all fuses and circuit breakers are intact; inspect the drive’s status LEDs and error code register for fault indications; and confirm proper wiring and grounding of the motor, encoder, and controller interfaces before proceeding to deeper component testing.[oss-gpt-20b]