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For sale is a Mitsubishi FREQROL FR-SX AC Spindle Controller Drive Unit. Item: Industrial AC spindle controller/inverter. Brand/Model: Mitsubishi Electric FREQROL, model FR-SX (label shows Type FR-SX- - K, code BD; Japan). Features: rack-mount metal chassis, LED fault/control indicators printed on the top cover, multiple plug?in boards and power section visible. Condition: Used with scuffs, scratches, and oxidation. Open-frame sides; rear fan openings appear empty (fans not present). Some covers/fasteners may be missing based on photos. Included: main unit only; no cables, connectors, or manuals. Use cases: machine tool/CNC spindle control, service, parts. Assumption: untested; offered for repair or refurbishment.