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MITSUBISHI Servo Drive
Brand: MITSUBISHI -
Cat: Servo Drive
Code:MDS-B-V1-20
| Combination name | Availability | Price |
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Servo/Spindle Drive Amplifier – Mitsubishi MDS-B-V1-20
The MDS-B-V1-20 is a servo/spindle drive amplifier (“Spindle/Servo Drive Amplifier”) from Mitsubishi Electric’s MDS-B (Mitsubishi Drive System – B series) family. Designed to operate with MELDAS M64, M64S and M65 CNC controllers, it is documented on vertical machining centres and CNC lathes equipped with Mitsubishi systems. The unit implements vector control of motor current and speed, communicating with the CNC via SSCNET fibre-optic serial bus; the suffix 20 denotes the rated current class of the drive. It belongs to the V1 family, designed for variable-speed spindles with encoder feedback.
The servo/spindle drive amplifier is the power electronics unit that converts the CNC’s digital commands into precisely controlled motor current: it closes the speed and torque loops to ensure stable and accurate rotation during machining. A drive failure causes the immediate stoppage of the spindle or the axis it serves, rendering the machine completely inoperable; any attempt to run without precise regulation results in dimensional rejects, vibration and serious mechanical hazards.
Mitsubishi Electric is one of the world’s leading manufacturers of industrial automation, CNC systems and servo drives, active in the electrical industry since 1921. The MDS-B series represents an established generation of CNC drives, now legacy / discontinued, superseded by the MDS-C1, MDS-D and MDS-EJ series; spare parts are available primarily as used stock, NOS from surplus inventory, or through specialist repair centres.
Main Technical Specifications
| Type | Servo/spindle drive amplifier (Spindle/Servo Drive Amplifier) |
| Part number | MDS-B-V1-20 (MDSBV120) |
| Brand | Mitsubishi Electric |
| Known application | Vertical machining centres and CNC lathes with Mitsubishi MELDAS M64, M64S, M65 control |
| Function | Vector control of servo/spindle motor speed and current; closed-loop torque and velocity regulation |
| Supply voltage | 3-phase, 200–230 V AC, 50/60 Hz (typical MDS-B series) |
| Rated current | ~20 A (indicated by the “20” suffix) |
| Communication bus | SSCNET (Servo System Controller NETwork) – fibre optic |
| Interfaces / connectors | SSCNET fibre-optic connector, power terminal strips, encoder and digital I/O connectors |
| Weight | ~2.0–4.5 kg |
| Dimensions | ~130–200 mm W × 250–370 mm H × 130–170 mm D |
| Production status | Legacy / discontinued — used/surplus/repair only |
