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CNC Spindle Inverter Drive – MITSUBISHI FR-SF-2-11KP
The FR-SF-2-11KP is an 11 kW variable-frequency spindle inverter drive (“Spindle Inverter Drive”) manufactured by Mitsubishi Electric, belonging to the FR-SF2 series (Freqrol Spindle, second generation). It is a variable-frequency drive designed specifically for vector control of spindle motors in CNC machine tools: vertical and horizontal machining centres, CNC milling machines and CNC lathes. It supports three-phase input voltage in the 200 V or 400 V class (depending on variant) and delivers three-phase variable-frequency output up to 400 Hz, providing the wide speed range demanded by high-speed spindle applications.
The spindle inverter is the heart of the spindle drive system: it receives the speed reference from the CNC controller and precisely regulates the frequency and voltage applied to the motor, ensuring stable rotation, constant torque and dynamic response during machining. A failure of the FR-SF-2-11KP renders the spindle completely inoperative — no rotation is possible — causing an immediate machine stop and total production shutdown.
Mitsubishi Electric Corporation is one of Japan’s leading industrial groups in industrial automation, power electronics and motion control. The FR (Freqrol) range covers the company’s flagship inverter family; the FR-SF and FR-SF2 series were developed specifically for high-performance CNC spindle applications. Models in this generation are considered legacy / discontinued: superseded by newer series (FR-A800, FR-F800), they are available only as used, surplus or through specialist repair services.
Main Technical Specifications
| Type | CNC spindle inverter drive (Spindle Inverter Drive) |
| Part number | FR-SF-2-11KP (FRSF211KP) |
| Brand | Mitsubishi Electric |
| Series | FR-SF2 (Freqrol Spindle – 2nd generation) |
| Known application | CNC vertical and horizontal machining centres, CNC milling machines, CNC lathes with variable-speed spindle |
| Function | Vector control of spindle motor; speed, torque and spindle orientation regulation |
| Rated output | 11 kW |
| Input voltage | 3-phase 200–230 V AC or 380–460 V AC, 50/60 Hz (depending on variant) |
| Output frequency | 0–400 Hz (typical for high-speed spindle applications) |
| Control method | Sensorless vector control / V/f; spindle orientation function |
| Interfaces | 3-phase power connectors, analogue/digital control terminal block, encoder/tachogenerator interface, alarm terminals |
| Weight | ~8–15 kg |
| Dimensions | ~250–420 × 190–320 mm H×W |
| Production status | Legacy / discontinued — available as used/surplus/repair only |
Spindle Drive Inverter 15 kW – MITSUBISHI FR-SE-2-15K
The FR-SE-2-15K is a 15 kW, 200 V class spindle drive inverter (“Spindle Drive Inverter”) from the FR-SE series of Mitsubishi Electric’s Freqrol® range. The part designation FR-SE-2-15K identifies the SE family (Spindle Edition), the 200 V three-phase supply class (digit “2”), and the 15 kW rated output power. The unit is documented as a spindle control component for machining centres, milling machines, and CNC lathes equipped with the Mitsubishi MELDAS control system or compatible CNC platforms. It converts the three-phase mains supply into variable-frequency three-phase output to drive the spindle motor, accepts an analogue speed reference from the CNC, and manages encoder or tachogenerator feedback to close the speed loop.
The spindle drive inverter is the electronic regulator that imposes and maintains the tool rotation speed throughout the machining cycle: it receives the speed setpoint from the CNC, processes the spindle encoder feedback, and generates the PWM-modulated three-phase voltage that powers the motor. Without it the spindle cannot start, hold cutting speed under load, or decelerate in a controlled manner; any failure causes an immediate machine stop and makes all cutting operations impossible.
Mitsubishi Electric is one of the world’s largest electrical engineering and industrial automation groups, founded in 1921. Its FA (Factory Automation) division manufactures Freqrol® inverters, MELSERVO® servo drives, and MELDAS® CNC systems widely used across the machine tool industry. Products in the FR-SE spindle drive series are legacy / discontinued, superseded by the FR-A700, FR-A800 generations and by the integrated spindle amplifier modules of current-generation CNC systems; available only as used, new-old-stock, or through specialist repair services.
Main Technical Specifications
| Type | Spindle drive inverter (VFD) – FR-SE series |
| Part number | FR-SE-2-15K (FRSE215K) |
| Brand | Mitsubishi Electric – Freqrol® range |
| Known application | Machining centres, milling machines and CNC lathes with Mitsubishi MELDAS or compatible control |
| Function | Closed-loop spindle motor speed control via variable-frequency drive (VFD) |
| Rated output power | 15 kW |
| Supply voltage class | 200 V (three-phase 200–240 V AC, 50/60 Hz) |
| Rated output current | ~52–60 A |
| Output frequency range | 0–400 Hz (typical FR-SE; verify against specific manual) |
| CNC interface | Analogue speed reference (±10 V); digital command/status I/O; MELDAS serial bus |
| Feedback | Spindle encoder or tachogenerator (closed speed loop) |
| Weight | ~8–14 kg |
| Dimensions | ~200–260 mm (W) × 400–520 mm (H) × 150–210 mm (D) |
| Production status | Legacy / discontinued — used/surplus/repair only |
Single-Axis Digital AC Servo Amplifier – MITSUBISHI MDS-B-V1-35
The MDS-B-V1-35 is a single-axis digital AC servo amplifier (“Single Axis AC Servo Amplifier”) manufactured by Mitsubishi Electric, belonging to the MDS-B series. It is documented as a component of Mitsubishi CNC systems equipped with MELDAS 500/600 control units, installed in vertical machining centres and CNC lathes. It manages the position, speed and torque regulation loops of a single servo axis, communicating with the CNC unit via the high-speed serial bus SSCNET. Compatible with HC and HA series AC brushless servo motors from Mitsubishi Electric; peak output current is 35 A.
The servo amplifier is the core of axis control: it receives position and speed commands from the CNC unit and, comparing them with the motor encoder feedback, generates the current required to move the axis with maximum precision and repeatability. A drive failure renders the affected axis inoperable and triggers a machine alarm: production stops until the drive is repaired or replaced with a working equivalent unit.
Mitsubishi Electric is one of the world’s leading manufacturers of CNC systems, servo amplifiers and motors for machine tools, with decades of experience in industrial motion control. The MDS-B series has been superseded by the later generations MDS-C, MDS-D and MDS-E; all MDS-B family products are therefore legacy / discontinued and available only as used stock, NOS (New Old Stock) or through specialist repair services.
Main Technical Specifications
| Type | Single-axis digital AC servo amplifier |
| Part number | MDS-B-V1-35 (MDSBV135) |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi vertical machining centres and CNC lathes with MELDAS 500 / 600 control |
| Function | Position, speed and torque regulation – single servo axis |
| Input voltage | 200–230 V AC, three-phase (from dedicated servo power supply unit) |
| Peak output current | 35 A |
| CNC communication | SSCNET – Servo System Controller NETwork (high-speed serial bus) |
| Compatible motors | Mitsubishi Electric AC brushless servo motors, HC and HA series |
| Interfaces / connectors | SSCNET connector, motor power connector (U/V/W), I/O and encoder feedback connectors |
| Weight | ~3–5 kg |
| Dimensions | ~200–280 mm H × 75–100 mm W × 130–180 mm D |
| Production status | Legacy / discontinued — available as used/NOS/repair only |
Variable Frequency Drive 11 kW – Mitsubishi FR-SE-2-11K-A
The FR-SE-2-11K-A is an 11 kW variable frequency drive (“Variable Frequency Drive / Inverter”) manufactured by Mitsubishi Electric, belonging to the FREQROL FR-SE series. The voltage class is 200 V three-phase, with a rated output power of 11 kW; the suffix “A” denotes the product revision. This drive is used for AC motor speed control on CNC machine tools, machining centres, and industrial automation systems; it may control the main spindle or auxiliary axes depending on the machine configuration.
The variable frequency drive converts fixed-frequency mains voltage into a three-phase output with variable frequency and amplitude, enabling precise speed and torque control of AC motors. In a CNC machine tool, failure of this component results in the immediate stoppage of the spindle or controlled axis, making it impossible to continue machining and potentially resulting in loss of the workpiece in progress; it is therefore a critical component for production continuity.
Mitsubishi Electric is a Japanese multinational corporation founded in 1921, a world leader in the production of industrial automation systems, inverters, servo drives, and CNC systems. The FREQROL FR-SE series is a general-purpose inverter line produced during the 1990s–2000s; all models in this family are legacy / discontinued and available exclusively as used, surplus, or through specialist repair services.
Main Technical Specifications
| Type | Variable frequency drive – three-phase AC inverter (Variable Frequency Drive) |
| Part number | FR-SE-2-11K-A (FRSE211KA) |
| Brand | Mitsubishi Electric (FREQROL FR-SE series) |
| Known application | CNC machine tools, machining centres, industrial automation (spindle / auxiliary axes) |
| Function | Three-phase AC motor speed and torque control via PWM modulation |
| Input voltage | Three-phase 200–230 V AC, 50/60 Hz (200 V class) |
| Rated output power | 11 kW |
| Rated output current | ~52 A |
| Output frequency range | 0–400 Hz (typical FR-SE series) |
| Control method | V/F; sensorless vector control (encoderless) |
| Interfaces | Analogue input 0–10 V / ±10 V; opto-isolated digital inputs; RS-485 serial |
| Protection class | IP20 (panel mounting) |
| Weight | ~6–14 kg |
| Dimensions | ~350–500 mm (H) × 200–300 mm (W) × 150–250 mm (D) |
| Production status | Legacy / discontinued — used/surplus/repair only |