MITSUBISHI Servo Drive

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Digital AC Spindle Drive – MITSUBISHI MDS-C1-SPH-300

The MDS-C1-SPH-300 is a digital AC spindle drive (“Digital AC Spindle Drive”) manufactured by Mitsubishi Electric, belonging to the MDS-C1 series. The designation SPH identifies the high-performance spindle drive variant (“Spindle High-performance”) within the series; the suffix 300 indicates a rated output power of approximately 30 kW. The unit is documented on CNC machining centres and lathes equipped with Mitsubishi CNC controllers of the M64, M65, and M700 series (MELDASMAGIC). It controls the spindle motor digitally via vector control, communicating with the CNC through the proprietary SSCNET serial bus (Servo System Controller NETwork). It can operate in a shared DC-bus configuration with MDS-C1-V servo drive units and MDS-C1-CV power supply/regenerative units.

The spindle drive receives speed and torque commands from the CNC via the SSCNET bus and precisely regulates the AC spindle motor through closed-loop vector control algorithms. Without this unit the spindle cannot be driven or speed-controlled: any fault triggers an immediate halt of machining operations and raises system alarms that lock the entire CNC installation.

Mitsubishi Electric is a division of the Mitsubishi Group, one of the world’s largest manufacturers of industrial automation, drives, and CNC systems. The MDS-C1 series is a line of digital AC drives introduced in the 1990s, now legacy / discontinued and replaced by the MDS-C2, MDS-D, and MDS-EJ2 series: available exclusively as used, surplus, or through specialist repair.

Main Technical Specifications