Fuji Electric FSD-15SN-2 Power Supply

Fuji Electric FSD‑15SN‑2 is the dedicated DC power supply module that feeds the 5 A spindle drive (FSD‑15SN/B‑Z) used in high‑speed CNC spindles. Common failure modes include transformer winding insulation breakdown, rectifier diode or bridge failure, electrolytic capacitor degradation, and overheating of the heat sink due to inadequate ventilation. First‑check diagnostics should verify input AC voltage and waveform, confirm the output DC rail (≈ ± 100 V) with a multimeter, inspect for bulging or leaking capacitors and burnt components on the board, and review any diagnostic error codes from the spindle controller that may point to power supply faults.[oss-gpt-20b]

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