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Drive CPU Board – MITSUBISHI SE-I01
The SE-I01 is an electronic drive CPU control board (“Drive CPU Board”) manufactured by Mitsubishi Electric, belonging to the drive family for MELDAS / MELSERVO CNC systems. The board integrates the main microprocessor responsible for executing drive control algorithms (current and speed loops), managing serial communications with the CNC unit, and supervising the converter’s hardware protections. It can be installed in servo and/or spindle drives of the compatible series.
The drive CPU board is the computational core of the drive unit: it receives position or speed references from the CNC controller, executes real-time regulation algorithms and generates commands for the power stage. A failure of this component renders the drive completely inoperative, preventing any controlled axis or spindle movement and causing an immediate machine stop.
Mitsubishi Electric is one of the world’s leading manufacturers of CNC systems, servo drives and industrial automation; its FA (Factory Automation) division has developed MELDAS numerical controllers and MELSERVO drives since 1970, widely used in milling machines, lathes and machining centres. Boards of this generation are legacy / discontinued: available only as used parts, surplus stock or through specialist repair centres.
Main Technical Specifications
| Type | Drive CPU control board (Drive CPU Board) |
| Part number | SE-I01 (SEI01) |
| Brand | Mitsubishi Electric |
| Known application | MELDAS / MELSERVO CNC drive series (Mitsubishi Electric) |
| Function | Regulation algorithm processing (current, speed), CNC–drive communication management, hardware protection supervision |
| Processor | Dedicated MCU / DSP for axis control (Mitsubishi proprietary architecture) |
| Communication | Serial interface to CNC unit (Mitsubishi proprietary protocol) |
| Logic supply | +5 V / ±15 V DC (typical) |
| Interfaces | Edge connectors / flat cable to power board and drive I/O |
| Weight | ~0.2–0.5 kg |
| Dimensions | ~150–260 mm × 100–180 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |
CNC Control Circuit Board – MITSUBISHI RF01
The part number RF01 identifies an electronic control board (“Control Circuit Board”) manufactured by Mitsubishi Electric, belonging to the Japanese manufacturer’s CNC and industrial automation product range. Specific technical documentation for code RF01 is limited: the board is compatible with Mitsubishi CNC systems of the MELDAS and/or MELSERVO series and may perform axis control, I/O management, encoder feedback, or servo drive regulation functions depending on the installation context. Revision variants cannot be excluded; compatibility must be verified against the relevant machine documentation before installation.
Electronic control boards in Mitsubishi CNC systems manage regulation, supervision, and communication functions between the main controller and the power or field components. A failure on this type of board typically causes immediate machine shutdown, non-resettable alarm errors, and inability to execute any machining cycle until the module is replaced or repaired.
Mitsubishi Electric is a Japanese multinational founded in 1921 and a world leader in industrial automation, motor drives, and CNC systems. The brand is active and current products are fully supported; however, modules from the legacy MELDAS and MELSERVO series of the 1980s–1990s are legacy / discontinued and available only through the used market or specialist repair services.
Main Technical Specifications
| Type | CNC electronic control board (Control Circuit Board) |
| Part number | RF01 |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi CNC systems MELDAS / MELSERVO series (verify against machine manual) |
| Function | CNC control and regulation (specific function to be verified on machine schematic) |
| Logic supply voltage | ±15 V / +5 V DC |
| Interfaces / connectors | Edge connectors / internal terminal strip (to be verified) |
| Feedback | Encoder / resolver / tachogenerator (to be verified on schematic) |
| Weight | ~0.2–0.8 kg |
| Dimensions | ~150–300 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |