Teijin-Seiki AR15 120-BA0 AC Motor

AR15A120‑BA0 is a Teijin‑Seiki AC servo motor with a 0.4 kW output, 120:1 gearbox and an absolute encoder. Common failure modes for this class include power supply over‑voltage, phase loss or imbalance, encoder misalignment or cable damage, and mechanical wear of the gear train. First‑check diagnostics should verify the incoming AC voltage and phase balance, inspect the motor windings for continuity and insulation resistance, and review any error codes from the attached drive or controller. If the drive reports a “phase loss” or “encoder fault,” check the encoder cable connections and ensure the encoder is properly seated on the shaft.[oss-gpt-20b]

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