NEC ASU40/30A Servo Driver

NEC ASU40/30A is a three‑phase AC servo driver (P003‑2039) rated at 30 A and designed for dual‑axis CNC or spindle applications. Common failure points include the power supply module (transformer, rectifier diodes, MOSFETs), motor drive ICs, and the analog input/output circuitry; overheating or overcurrent can also damage the internal gate drivers. For a first‑pass check, verify that the 200–230 VAC input is present and within spec, inspect the power supply board for burnt components or loose connections, and review any error codes displayed on the drive’s panel or via its communication port.[oss-gpt-20b]

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