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MITSUBISHI Servo Drive
Brand: MITSUBISHI -
Cat: Servo Drive
Code:TRS 75B
| Combination name | Availability | Price |
|---|---|---|
Transistor Drive Unit – Mitsubishi TRS 75B
The TRS 75B is an electronic transistor drive unit for servo/spindle motors (“Transistor Drive Unit”) manufactured by Mitsubishi Electric, belonging to the TRS series of transistorised drive amplifiers. It is documented as a drive control unit in CNC systems based on Mitsubishi MELDAS controllers and Japanese machining centres / lathes from the 1980s–1990s. It manages the motor speed and current regulation loops, interfacing with the power module and the numerical controller. The suffix 75B identifies the current/power size variant and the board revision within the series.
The transistor drive unit is the core of the axis or spindle control system: it receives the speed reference from the CNC, closes the feedback loop with the motor encoder or tachogenerator, and drives the power transistors to deliver the current required for the demanded torque. A failure of this unit results in complete loss of control of the connected motor, causing immediate axis or spindle shutdown and making any further machining impossible.
Mitsubishi Electric is one of the world’s leading manufacturers of CNC systems, servo drives, and servo motors for machine tools, with over 50 years of experience in the industry. The TRS series belongs to the legacy generation of Mitsubishi’s product range; these products are legacy / discontinued and available exclusively as used, NOS surplus, or through specialist repair.
Main Technical Specifications
| Type | Transistor servo/spindle drive unit (Transistor Drive Unit) |
| Part number | TRS 75B (TRS75B) |
| Brand | Mitsubishi Electric |
| Known application | CNC machining centres and lathes with Mitsubishi MELDAS control system; Japanese machine tools 1980s–1990s |
| Function | Speed and current regulation of servo/spindle motor via transistorised PWM power stage |
| Supply voltage | ~200–230 V AC three-phase (typical for the series; verify on nameplate) |
| Current / Power rating | See nameplate — suffix 75 identifies the current/power size within the series |
| Control method | Transistor PWM; closed-loop speed and current control |
| Feedback | Encoder / tachogenerator from servo or spindle motor |
| Interfaces / connectors | Edge connectors and terminal strips; interface to CNC and power stage |
| Weight | ~0.5–1.5 kg |
| Dimensions | ~150–300 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
