FUJI

Spindle Inverter Drive 3.7 kW – Fuji Electric FRN3. 7M5-2

The FRN3. 7M5-2 is a 3.7 kW CNC spindle inverter drive (“Spindle Inverter Drive”) from the FRENIC 5000MS5 series, manufactured by Fuji Electric. Designed specifically for variable-speed spindle control in CNC machine tools (vertical and horizontal machining centres, CNC lathes, milling machines), the drive converts three-phase mains voltage into variable-frequency, variable-voltage output to control spindle motor speed and torque. It incorporates features dedicated to machine tool requirements: spindle orientation for automatic tool change, C-axis mode, and DC braking. Available in multiple power ratings within the same MS5 family.

The FRENIC 5000MS5 spindle inverter drive is the electronic unit that converts three-phase mains power into variable frequency and voltage to govern spindle motor speed and torque throughout every phase of the machining cycle. It manages critical functions including spindle orientation for automatic tool changers, closed-loop control via encoder feedback, and rapid braking on stop. A failure of this unit renders the spindle completely uncontrollable, halting production and requiring immediate specialist intervention.

Fuji Electric Co., Ltd. is a Japanese industrial group founded in 1923 and one of the world’s leading manufacturers of industrial inverters, electric drives and automation systems. The FRENIC 5000MS5 series was dedicated specifically to the CNC machine tool industry and is today legacy / discontinued, superseded by newer lines such as FRENIC-Ace and FRENIC-MEGA; spares are available only as used units, surplus stock or through specialist repair services.

Main Technical Specifications

Variable Frequency Drive (Inverter) – FUJI FRN003M3-21

The FRN003M3-21 is a variable frequency drive / inverter (“Variable Frequency Drive” – VFD) belonging to the FRENIC family manufactured by FUJI Electric. The part number identifies a compact frequency converter in the ~0.3–0.4 kW power class, 200 V class, designed for the speed control of three-phase induction motors in industrial applications and CNC machine tools. The unit belongs to one of the historical compact FRENIC series produced by FUJI Electric from the 1990s onward for motion control applications across a wide range of manufacturing sectors.

The frequency inverter converts fixed-frequency mains power into a variable-frequency, variable-amplitude three-phase output, enabling continuous and precise speed regulation of the driven induction motor. In a CNC machine tool it can serve the low-power spindle drive, coolant pump, chip conveyor, or auxiliary axes. A failed inverter immediately halts the controlled function in an uncontrolled manner: without it the motor cannot start or vary its speed, rendering the served machine section completely inoperative.

FUJI Electric Co., Ltd. is a leading Japanese power electronics manufacturer, founded in 1923 as a joint venture between Furukawa Electric and Siemens. The FRENIC inverter family covers power ratings from a few watts to hundreds of kilowatts and is deployed worldwide in CNC, HVAC, and industrial automation applications. Models from the M3 series and contemporaneous variants are to be regarded as legacy / discontinued: available only as used, surplus, or through specialist repair.

Main Technical Specifications

AC Spindle Drive – FUJI FMD-11AC-21A

The FMD-11AC-21A is an AC spindle drive (“AC Spindle Drive”) from the FRENIC 5000M2 series by Fuji Electric. Designed specifically for vector speed and torque control of AC spindle motors on CNC machine tools, it sits between the mains supply and the spindle motor, converting fixed mains voltage into variable voltage and frequency. The prefix FMD identifies the spindle drive family within the FRENIC 5000M2 series; the numeric designation encodes the power class (~11 kW), AC indicates alternating-current technology, and 21A specifies the voltage variant (200 V class) and hardware revision. The unit may exist in multiple revisions and variants; option modules such as serial communication boards, EMI filters and encoder interface cards were available as separate accessories.

The AC spindle drive is the electronic core of the spindle speed control system in the machine tool: it receives the speed reference from the CNC, closes the speed and torque loop via encoder or tachogenerator feedback, and supplies the motor with the power required to hold the programmed speed constant under varying cutting loads. Failure of this unit causes immediate spindle shutdown and total machine downtime: no machining is possible until the drive is replaced or repaired, with consequent production losses and risk of scrapped workpieces.

Fuji Electric is a Japanese industrial group founded in 1923 and a world leader in the design and manufacture of AC/DC drives, inverters and industrial automation systems for precision applications. The FRENIC 5000M2 series belongs to the generation of CNC machine-tool spindle drives from the 1990s–2000s and is now legacy / discontinued: spare units are available only as used, NOS surplus, or through specialist repair centres.

Main Technical Specifications

Positioning Control Board – FUJI EP-3358C-C

The EP-3358C-C is an electronic positioning control board (“Positioning Control Board”) manufactured by FUJI Electric, designed for use in CNC systems and industrial automation equipment of the same make. The board handles axis position control and feedback processing from encoders or resolvers, interfacing with the servo drives within the same control system. It is not a CPU or generic I/O module, but a dedicated unit for precise machine axis positioning.

The positioning board is the electronic module that closes the position loop in the CNC system: it processes axis encoder feedback signals, calculates position error, and generates correction references for the servo drives. Without it, precise axis positioning is impossible: any machining operation requiring tight geometric tolerances would produce out-of-tolerance parts or risk collisions due to position reference errors.

FUJI Electric is a Japanese manufacturer with over a century of history in industrial electronics, founded in 1923 as a joint venture between Furukawa Electric and Siemens. Specialised in power electronics, drives, CNC systems and factory automation (FA), its product lines include the FRENIC inverter series and Alpha servo systems. Products in the EP-3358C-C family belong to a legacy / discontinued generation of controls and are available only as used units, NOS stock, or through specialist repair services.

Main Technical Specifications

Axis Positioning Control Board – FUJI EP-3308D-C

The EP-3308D-C is an electronic axis positioning control board (“Axis Positioning Control Board”) manufactured by FUJI Electric, belonging to the numerical control and industrial automation product family of the same manufacturer. The board processes position commands from the CNC CPU, compares them with axis encoder feedback signals, and calculates the speed reference to be transmitted to the drives. The series identifier EP-3308 designates the board family within FUJI’s positioning control range for this generation; the suffix identifies variant D and revision C.

The axis positioning board is the central element of motion control: it receives position commands from the CNC processor, compares them with the feedback signal (encoder or resolver), and calculates the following error to continuously correct the axis trajectory. Without this board, the CNC system loses complete control of the axes: any movement becomes uncontrolled, with consequent risk of collision, dimensional rejection of the workpiece, or serious mechanical damage to the machine.

FUJI Electric is a Japanese industrial group founded in 1923, with strong specialisation in power electronics, inverters, drives, CNC systems and industrial automation. Historically present in the machine tool market with proprietary axis control systems, the group has progressively oriented its offering towards new-generation integrated solutions. The CNC control modules and boards of this series are legacy / discontinued: available exclusively as used, surplus or through specialist repair.

Main Technical Specifications

Variable Frequency Inverter Drive – FUJI FRN018M3-21

The FRN018M3-21 is a variable frequency inverter drive (“Variable Frequency Drive” – VFD) from the FRENIC® series, manufactured by FUJI Electric. The unit is designed for scalar (V/f) or vector control of three-phase asynchronous motors in industrial applications, and is documented in CNC systems and machine tools as a spindle drive or feed-axis drive. The designation FRN018M3-21 identifies: prefix FRN (FRENIC family), nominal rating 018, series M3 (FRENIC-5000 M, third generation), suffix 21 (voltage/configuration code: 200 V class). The unit may exist in hardware revision variants; optional accessories such as a remote operator panel and EMC filters may not be included in the standard supply.

The variable frequency drive is the component that regulates the rotation speed of an asynchronous motor by continuously varying the supply frequency and voltage: in a CNC machining centre it controls the spindle (cutting speed) or the feed axes (feed rate). Failure of the drive causes the immediate stop of the controlled axis or spindle, rendering the machine completely inoperable until the module is replaced or repaired.

FUJI Electric Co., Ltd. is a Japanese multinational founded in 1923 as a joint venture between Furukawa Electric and Siemens, specialising in electric drives, power components, UPS systems and industrial automation. The FRENIC series is Fuji’s historic line of industrial inverters, evolved from the FRENIC-5000 through to the current FRENIC-Ace and FRENIC-AQUA. All products in the FRENIC-5000 M family are legacy / discontinued: available exclusively as used stock, NOS (new-old-stock) or through specialist repair services.

Main Technical Specifications

AC Inverter FRENIC 5000P11 15 kW – FUJI FRN15P11S-2

The FRN15P11S-2 is a 15 kW AC variable frequency drive (VFD – “AC Variable Speed Drive”) belonging to the FRENIC 5000P11 series, manufactured by FUJI Electric and rated for the 200 V three-phase voltage class. The unit implements V/f control and, in advanced variants, sensorless vector control of three-phase induction motors. It is documented as a drive component in numerous CNC machining centres and industrial machines from the 1990s and 2000s equipped with FUJI P11-series inverters. The control connector is a standard multi-pin terminal strip compatible with the entire FRENIC 5000P11 product family.

The FRENIC 5000P11 inverter converts mains voltage to variable-frequency AC, enabling precise speed and torque control of the connected induction motor. In a CNC machining centre, its failure renders the controlled axis or spindle inoperative: production stops and no controlled movement is possible. Replacement with a different model requires full parameter reconfiguration and verification of analogue and digital control signal compatibility.

FUJI Electric is a Japanese manufacturer founded in 1923, a world leader in frequency converters, power equipment, and industrial automation systems. The FRENIC 5000P11 series was commercialised from the late 1990s; the model is now classified as legacy / discontinued and is no longer directly supported by the manufacturer: availability is limited to used stock, surplus parts, and specialist repair services.

Main Technical Specifications

1.5 kW General-Purpose Inverter – FUJI FRN1.5G9S-2

The FRN1.5G9S-2 is a variable frequency drive (VFD) (“Variable Frequency Drive”) from the FRENIC 5000G9S series by FUJI Electric, rated at 1.5 kW with a 200 V class three-phase input. The G9S designation identifies the ninth generation of the General Purpose series; the suffix “2” denotes the 200 V AC voltage class. The unit implements sinusoidal PWM modulation with V/f law and sensorless vector control, and is documented as a drive for three-phase induction motors in machine tool installations, conveyor lines, and CNC auxiliary systems. No significant hardware revisions are known for this power rating; no optional accessories are included as standard.

The inverter regulates the speed and torque of the electric motor by continuously varying the output frequency and voltage: it receives the speed reference from the CNC (analogue ±10 V or digital) and provides controlled acceleration/deceleration ramps, overcurrent protection, and overtemperature protection. A failed inverter causes the controlled motor to stop and prevents restart: on a CNC axis or spindle this results in an immediate machine halt, loss of production, and potential dimensional rejects on the workpiece in progress.

FUJI Electric is a Japanese industrial group founded in 1923, specialising in electric drives, power systems, and factory automation; the brand is globally recognised for the reliability of its inverters in industrial applications. The FRENIC 5000G9S series represents one of FUJI’s general-purpose inverter generations from the 1990s; current FUJI production focuses on the FRENIC-Ace and FRENIC-MEGA families. The FRN1.5G9S-2 belongs to a legacy / discontinued product family: available exclusively as used, NOS (New Old Stock), or through specialist repair services.

Main Technical Specifications