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AC Vector Control Inverter / Drive – Bonfiglioli Vectron ACT400-040 C
The ACT400-040 C is a three-phase AC vector control inverter (“AC Vector Drive”) from the Vectron series manufactured by Bonfiglioli. It belongs to the ACT400 family, designed for powering and controlling three-phase asynchronous motors in industrial and CNC machine tool applications. The part number identifies a unit with a 400 V three-phase supply voltage and power/current class 040; the suffix C denotes the hardware variant or revision. The unit incorporates field-oriented control (FOC – Field Oriented Control) for precise motor torque and speed management.
The inverter is the component that converts mains voltage into variable frequency and voltage to control the speed and torque of the asynchronous motor: it receives the speed reference from the CNC unit and keeps the axis or spindle at the required operating condition with high dynamic precision. A faulty inverter renders the driven motor completely inoperative, halting production and triggering system alarms in the numerical control; its replacement or repair is essential to restore machine functionality.
Bonfiglioli Riduttori S.p.A. is an Italian company founded in 1956, a world leader in motion transmission and industrial electronic drives. The inverter division operates under the Vectron brand (formerly Bonfiglioli Vectron GmbH, based in Germany). Older versions of the ACT400 series may be legacy / discontinued: verify availability with Bonfiglioli or contact specialist repair centres.
Main Technical Specifications
| Type | Three-phase AC vector control inverter (AC Vector Drive) |
| Part number | ACT400-040 C (ACT400040C) |
| Brand | Bonfiglioli – Vectron (Vector Drive) |
| Known application | CNC machine tools, axis and spindle drives, three-phase 400 V industrial applications |
| Function | Frequency/voltage conversion for AC asynchronous motor speed and torque control |
| Input voltage | 3 × 400 V AC, 50/60 Hz |
| Power class | 040 |
| Output voltage | 3 × 0–400 V AC variable |
| Output frequency | 0–400 Hz (typical for Vectron ACT series) |
| Control technology | Field-oriented vector control (FOC) |
| Interfaces | Analogue and digital I/O; fieldbus (optional); control terminal strip |
| Weight | ~2–6 kg |
| Dimensions | ~150–300 mm H × 100–200 mm W |
| Production status | Legacy / discontinued (older versions) — verify availability with Bonfiglioli |