NEC ASUOSA Servo Drive

The NEC ASUOSA (e.g., ASU15A) servo drive is a compact AC/ DC amplifier used to power industrial servo motors in motion‑control applications. Common failure modes include overheating of the internal MOSFETs or IGBT modules, loss of phase‑shift calibration, and capacitor degradation on the high‑voltage side. For this class of drives, inspect for burn marks, check the input voltage against the datasheet (200–230 V AC or 24 V DC as specified), verify that all output capacitors are within tolerance, and review any error codes displayed on the drive’s panel or via the PLC interface. First‑check steps: confirm proper power supply conditioning, perform a visual inspection of solder joints and component integrity, and run a diagnostic routine to capture fault logs.[oss-gpt-20b]

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