Inverter

37 kW Frequency Inverter – Mitsubishi FR-AF740-00770-EC

The FR-AF740-00770-EC is a 37 kW frequency inverter (“Variable Frequency Drive” – VFD) manufactured by Mitsubishi Electric, belonging to the FREQROL-F740 series. The EC suffix identifies the European version (CE marking, compliant with applicable EN directives). Designed for heavy industrial loads such as spindle motors, pumps, and industrial fans, it operates on a three-phase 380–480 V AC supply and delivers variable voltage and frequency to the controlled AC motor. The F740 series supports both V/f control and sensorless vector control (Advanced Magnetic Flux Vector), with expansion capabilities via optional boards for the main industrial communication protocols.

The frequency inverter converts fixed-frequency mains voltage (50/60 Hz) into a variable-frequency, variable-voltage three-phase output, enabling precise speed control of an AC induction motor. In CNC machine tools it is typically used to drive the main spindle, lubrication pumps, or unit cooling fans. A drive failure causes the controlled motor to stop immediately and halts the machining process entirely, making it a critical component for production continuity.

Mitsubishi Electric is a division of the Mitsubishi Group (founded 1921) and one of the world’s leading manufacturers of industrial drives, factory automation, and power electronics. The FREQROL-F740 series was developed for high-efficiency applications in HVAC, pumping, and machine-tool markets. This family has since been superseded by the FR-F800 series; F740 products are legacy / discontinued and available primarily as surplus stock, tested used units, or through specialist repair services.

Main Technical Specifications

Freqrol Inverter 0.75 kW – MITSUBISHI FR-Z024-0.75K

The FR-Z024-0.75K is a variable frequency drive (inverter) from the FREQROL FR-Z series (“Frequency Inverter” / “Variable Frequency Drive”) manufactured by Mitsubishi Electric, rated for 0.75 kW three-phase AC induction motors. The unit belongs to the 200–240 V voltage class and is documented for applications in CNC machine tools and industrial equipment requiring electronic speed control of AC motors. No accessory revisions or documented variants are known; the part number identifies a single nameplate configuration.

The inverter converts fixed-frequency mains power into a variable-frequency, variable-voltage three-phase output, enabling stepless speed control of an AC induction motor. On a CNC machine tool it typically drives auxiliary spindles, coolant pumps, hydraulic units, or other accessory drives. Inverter failure immediately stops the driven device, interrupting the machining cycle or disabling critical machine functions.

Mitsubishi Electric is a Japanese multinational of the Mitsubishi Group and one of the world’s leading industrial automation manufacturers. Its Factory Automation division produces FREQROL inverters, MELDAS / MELDASMAGIC CNC systems, and MELSERVO servo drives. The FR-Z series is legacy / discontinued, superseded by the more modern FR-E, FR-A, and FR-F series; spares are available only as used, NOS surplus, or through specialist repair.

Main Technical Specifications

Three-Phase Vector Inverter 5.5 kW – MITSUBISHI FR-A520-5.5K

The FR-A520-5.5K is a three-phase 5.5 kW vector frequency inverter (“Variable Frequency Drive”, 200 V voltage class) manufactured by Mitsubishi Electric, belonging to the FREQROL-A500 series (FR-A520 line). Designed for industrial applications and CNC machine tools, it converts three-phase mains voltage into variable-frequency AC output (0.5–400 Hz) using advanced magnetic flux vector control. It supports V/f and vector control modes (sensorless and encoder-feedback); it features analogue reference inputs for speed control and a serial interface for communication with the CNC system.

The frequency inverter is the core of the AC induction motor drive system: it converts fixed-frequency mains voltage into variable voltage and frequency, enabling precise control of motor speed and torque. In the event of failure, the controlled motor becomes unmanageable, causing the immediate shutdown of the axis or spindle and rendering the machine completely inoperable until the component is replaced or repaired.

Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation systems, renowned for the reliability and longevity of its FREQROL® inverter range. The A500 series is legacy / discontinued, superseded by the A700 and A800 series; spare parts are available exclusively as used, surplus, or through specialist repair services.

Main Technical Specifications

FREQROL-A200 AC Inverter Drive 7.5 kW – Mitsubishi FR-A220E-7.5K

The FR-A220E-7.5K is a three-phase AC variable frequency drive (“AC Variable Frequency Drive”) rated at 7.5 kW, belonging to the FREQROL-A200 series by Mitsubishi Electric. Designed for speed control of three-phase asynchronous motors in industrial and CNC machine tool applications, the FR-A220E-7.5K belongs to the 200 V voltage class (input 3~ 200–240 V AC, 50/60 Hz) and delivers a three-phase output at variable frequency and amplitude, typically between 0.5 and 400 Hz. The unit integrates V/f control logic and features digital and analogue I/O for interfacing with the CNC or machine PLC. It is available in multiple hardware revisions; some versions support the vector control option with encoder feedback (PG option).

The inverter converts the mains supply into a three-phase voltage with variable frequency and amplitude, enabling precise motor speed control. On a machine tool it manages spindle or auxiliary axis acceleration and deceleration ramps, provides thermal and overcurrent motor protection, and maintains stable rotation under varying load. A drive failure causes the immediate stop of the controlled spindle or axis, rendering the machine inoperable until the unit is replaced or repaired.

Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation, motion control and power electronics. The FREQROL brand covers Mitsubishi’s inverter range, in production since the 1980s and continuously updated with the current FR-F800, FR-E800 and FR-A800 series. The FREQROL-A200 series (“FR-A220E”) is legacy / discontinued: no longer manufactured or officially supported, it is available only as used/surplus stock or through specialist repair services.

Main Technical Specifications