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AC Spindle Drive – MITSUBISHI MDS-C1-V2-3520
The MDS-C1-V2-3520 is an AC spindle drive unit (“AC Spindle Drive”) manufactured by Mitsubishi Electric, belonging to the MDS-C1 series for MELDAS CNC systems. Designed for vector control of the AC spindle motor, the module integrates speed and torque regulation loops and interfaces the CNC controller with the motor stage via SSCNET (Serial Servo Control Network) bus or analogue reference ±10 V. The suffix V2-3520 identifies the variant with rated power in the 35 kVA range, intended for medium-to-high power applications on machining centres and CNC lathes. The module may feature hardware variants (revisions) and requires parameter configuration through the paired CNC controller.
The spindle drive is the core of spindle motor control: it receives the speed reference from the CNC, closes the regulation loop in feedback, and generates the three-phase currents needed to maintain stable and precise rotation during machining. A failure of the unit makes the spindle completely uncontrollable, with immediate loss of production capability; even partial anomalies result in speed instability, torque variations, and dimensional defects on the workpiece.
Mitsubishi Electric is one of the world’s leading industrial automation equipment manufacturers, headquartered in Tokyo, founded in 1921. The FA (Factory Automation) division produces MELDAS CNC systems, servo drives, motors, and PLCs widely adopted in the global machining industry. The MDS-C1 series is legacy / discontinued: superseded by the MDS-D1, MDS-DH2, and MDS-EX generations, it is today available exclusively as used parts, NOS surplus, or through specialist repair centres.
Main Technical Specifications
| Type | AC spindle drive unit (AC Spindle Drive) |
| Part number | MDS-C1-V2-3520 (MDSC1V23520) |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi MELDAS M60/M64/M65/M66 CNC systems; vertical and horizontal machining centres, CNC lathes |
| Function | Vector control of AC spindle motor speed and torque; speed and current loop closure |
| Input voltage | 3~ 200 V AC, 50/60 Hz (MDS-C1 200 V series) |
| Rated power | ~35 kVA |
| CNC interface | SSCNET (Serial Servo Control Network) / analogue reference ±10 V |
| Feedback | Incremental encoder / tachogenerator from spindle motor |
| Logic supply | 24 V DC (typical for logic/control section) |
| Cooling | Integrated forced-air fan |
| Weight | ~8–15 kg |
| Dimensions | ~300×250×180 mm |
| Production status | Legacy / discontinued — MDS-C1 series superseded by MDS-D1, MDS-DH2, MDS-EX |