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OKUMA Servo Drive
Brand: OKUMA -
Cat: Servo Drive
Code:VACII D-11A
| Combination name | Availability | Price |
|---|---|---|
Servo Axis Drive – OKUMA VACII D-11A
The VACII D-11A is a servo axis drive (“Servo Velocity Amplifier Drive”) manufactured by OKUMA Corporation, belonging to the VACII (Velocity Amplifier Control II) series. It is documented as a component of OKUMA CNC machining centres and lathes equipped with the OSP-5000 and OSP-7000 control systems. The unit manages the velocity loop of the DC axis servo motor, receiving the speed reference from the OKUMA controller and driving the power stage of the drive. The component may exist in construction variants related to the firmware revision of the corresponding OSP control.
The servo axis drive is the electronic controller that closes the velocity loop on the axis motor: it receives the speed reference from the CNC and drives the motor maintaining the required position and speed during machining. A failure in this unit causes immediate loss of control of the corresponding axis, with a CNC alarm and machine stop; as a proprietary OKUMA component, replacement requires an identical unit or specialist repair on OKUMA hardware.
OKUMA Corporation, founded in 1898 in Nagoya, Japan, is one of the world’s leading manufacturers of CNC machine tools and proprietary control systems (the OSP – Okuma Servo Pack series). OKUMA develops both machines and controllers in-house, ensuring tight hardware/software integration. Components of the VACII series are legacy / discontinued: available only as used, surplus, or through specialist repair.
Main Technical Specifications
| Type | Servo axis drive (Servo Velocity Amplifier Drive) |
| Part number | VACII D-11A (VACIID11A) |
| Brand | OKUMA Corporation |
| Known application | OKUMA CNC machining centres and lathes with OSP-5000 / OSP-7000 control |
| Function | DC axis servo motor speed and current regulation |
| Reference input | Analogue speed reference (±10 V) |
| Feedback | Tachogenerator / encoder from axis servo motor |
| Supply voltages | 200–230 V AC three-phase (power stage); ±15 V / +5 V DC (logic) – typical |
| Interfaces | Terminal strips / rack connectors; OKUMA proprietary internal bus |
| Weight | ~1.5–3.5 kg |
| Dimensions | ~250–400 mm |
| Production status | Legacy / discontinued — used / surplus / repair only |
