Nec ASU 40/30-2 AC Servo Driver

The NEC ASU 40/30‑2 is an AC servo driver designed for three‑axis CNC or motion control applications, providing current limiting and over‑temperature protection. Common failure points include the power MOSFET array (burnt due to overload), the gate drive ICs (shorted or open), and the input/output logic circuitry (faulty I/O buffers or damaged signal lines). Initial checks should verify that the supply voltage is within spec, inspect for visible burn marks on the board and test the MOSFETs with a multimeter for continuity and leakage; also review any error codes from the drive’s diagnostic port to pinpoint the fault.[oss-gpt-20b]

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We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.

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