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AC Frequency Inverter 7.5 kW – Mitsubishi FR-SE-2-7.5K
The FR-SE-2-7.5K is an AC frequency inverter rated at 7.5 kW (“AC Frequency Inverter”) manufactured by Mitsubishi Electric, belonging to the FR-SE (Freqrol) series, designed for variable-speed control of three-phase asynchronous motors in industrial applications and CNC machine tools. The unit dynamically varies output frequency and voltage through PWM (Pulse Width Modulation) modulation to match motor speed to the machining cycle set by the numerical control. The 7.5 kW model is suitable for controlling medium-power spindles, hydraulic pumps, and auxiliary axes. The product may be available in multiple hardware revisions; some versions include an integrated operator panel and dedicated digital and analogue I/O.
The frequency inverter regulates AC motor speed by dynamically varying the supply frequency and voltage: this function is critical in CNC machine tools where spindle or auxiliary axis speed must accurately follow the parameters set by the numerical control. In the event of failure, the controlled motor loses all speed regulation and can no longer follow the CNC reference, making precision machining impossible and risking damage to the tool, workpiece, or machine itself.
Mitsubishi Electric is one of Japan’s leading multinationals in industrial automation, present in the frequency inverter market with the Freqrol (FR) line since the 1980s. The FR-SE series was a compact family designed for robust and straightforward industrial applications; all models in this series are legacy / discontinued and have been superseded by the more recent FR-E800 and FR-D800 series.
Main Technical Specifications
| Type | AC frequency inverter (AC Frequency Inverter) – FR-SE series |
| Part number | FR-SE-2-7.5K (FRSE275K) |
| Brand | Mitsubishi Electric – Freqrol FR-SE (legacy) |
| Known application | CNC machine tools; medium-power spindle, auxiliary axis and hydraulic/coolant pump speed control |
| Function | Variable-speed control of three-phase AC motor via PWM modulation; output frequency and voltage regulation |
| Rated power | 7.5 kW |
| Input voltage | 3~ 200–230 V AC, 50/60 Hz — 200 V class |
| Rated output current | ~38–42 A |
| Output frequency | 0–400 Hz (typical for FR-SE series) |
| Interfaces / connectors | Power terminal strip (R/S/T – U/V/W); control terminal strip (digital and analogue I/O ±10 V); optional operator panel |
| Weight | ~3–5 kg |
| Dimensions | ~200 × 150 × 200 mm (H × W × D) |
| Production status | Legacy / discontinued — used/surplus/repair only |