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MITSUBISHI Spindle Drive
Brand: MITSUBISHI -
Cat: Servo Drive
Code:MDS-C1-SPH-150
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AC Spindle Drive Amplifier – MITSUBISHI MDS-C1-SPH-150
The MDS-C1-SPH-150 is an AC spindle drive amplifier (“AC Spindle Drive Amplifier”) from the MDS-C1 series by Mitsubishi Electric, designed for MELDAS CNC systems (series M60, M64, M65, M70, C64). The designation SPH identifies the high-power variant of the spindle drive, while the suffix 150 indicates a nominal output of approximately 15 kW. The module belongs to a family of fiber-optic serial communication drives that integrate directly with the CNC unit without separate analogue feedback wiring.
The MDS-C1-SPH-150 spindle drive amplifier converts fixed-frequency mains AC power into variable-frequency, variable-voltage three-phase output to drive the spindle motor at the speed reference commanded by the CNC. It manages both the speed and current control loops, ensuring stable torque and rotation throughout the machining process. A failure of this module causes complete loss of spindle control, making it impossible to start any machining cycle and causing an immediate machine stop.
Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation and CNC systems, with over a century of history in the electrical and automation sector. The MDS-C1 series was widely deployed in CNC machining centres and lathes from the late 1990s through the 2000s, and is now legacy / discontinued: official support is limited and components are available only as used/surplus or through specialist repair services.
Main Technical Specifications
| Type | AC spindle drive amplifier (AC Spindle Drive Amplifier) |
| Part number | MDS-C1-SPH-150 (MDSC1SPH150) |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi MELDAS CNC systems M60, M64, M65, M70, C64; CNC machining centres and lathes |
| Function | AC spindle motor speed and current regulation; closed-loop control via CNC |
| Rated output | ~15 kW |
| Input voltage | 3-phase 200–240 V AC, 50/60 Hz (typical MDS-C1 series) |
| Output voltage | 3-phase variable PWM output for AC spindle motor |
| CNC interface | High-speed serial fiber-optic bus (MDS bus) |
| Connectors | Multi-pin bus connectors; fiber optic TX/RX; power terminal strips |
| Weight | ~3–6 kg |
| Dimensions | ~150–250 mm × 300–450 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
