MITSUBISHI Servo Drive

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Spindle Servo Drive – MITSUBISHI MDS-B-V1-70

The MDS-B-V1-70 is a spindle amplifier (“Spindle Amplifier”) from the MDS-B series (Motion Drive System – B series) by MITSUBISHI Electric, designed for closed-loop control of the spindle motor in MELDAS CNC systems. The V1 suffix identifies a single-spindle unit; the value 70 denotes the rated output current class (≈ 70 A, corresponding to approximately 7–14 kW depending on the coupled motor). The module is documented on vertical and horizontal machining centres, CNC lathes, and grinding machines from various OEM builders — including Mori Seiki, Mazak, and DMG — using the MELDAS M600 / M700 platform and related systems.

The MDS-B-V1-70 spindle servo drive closes the speed and current loop on the spindle motor: it receives the speed reference from the CNC via the proprietary MDS serial bus and regulates the output torque to maintain stable rotation under varying load during machining. A failure renders the spindle uncontrollable, prevents any machining cycle, and may trigger overcurrent or overtemperature alarms that halt the entire machine.

MITSUBISHI Electric is one of the world’s leading manufacturers of industrial automation systems, CNC controllers, and machine tool drives; its FA (Factory Automation) division has developed the MELDAS line since the 1970s across multiple product generations. The MDS-B series is an established generation now progressively superseded by the MDS-C1, MDS-D, and MDS-E series; MDS-B products are to be considered legacy / discontinued.

Main Technical Specifications