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OKUMA Servo Drive
Brand: OKUMA -
Cat: Servo Drive
Code:VAC D-11
| Combination name | Availability | Price |
|---|---|---|
AC Drive Unit – OKUMA VAC D-11
The VAC D-11 is an AC drive unit (“AC Drive Unit”) manufactured by OKUMA, documented as a component of OKUMA CNC systems equipped with the OSP (OKUMA Servo Pack) control. The drive handles speed and torque regulation of AC motors, covering both linear axes and the spindle, and interfaces directly with the numeric control via a proprietary bus. The designation VAC refers to “Vector AC” control technology, adopted by OKUMA for its machine series from the 1980s–1990s.
The VAC drive unit is the power and regulation node that converts the CNC’s digital references into voltage and current for the machine’s AC motors: without it, the controlled axis or spindle receives no regulated power and the machine halts immediately on alarm. A drive failure typically results in position loss, dimensional rejects, or an abrupt machining cycle stop with collision risk.
OKUMA Corporation, founded in Japan in 1898, is one of the world’s leading CNC machine tool manufacturers (lathes, machining centres, grinders) and develops its own machines, CNC controls (OSP series) and drives in-house, ensuring full hardware/software integration. Products from the legacy VAC series are legacy / discontinued: available only as used, NOS surplus, or through specialist repair.
Main Technical Specifications
| Type | AC drive unit (AC Drive Unit – Vector Control) |
| Part number | VAC D-11 (VACD11) |
| Brand | OKUMA Corporation (Japan) |
| Known application | OKUMA CNC machine tools with OSP control (machining centres, lathes, grinders) |
| Function | Vector control of AC motors for linear axes or spindle |
| Input supply | AC three-phase, 200–400 V (typical for VAC series) |
| Output | Variable voltage and current to AC motor (PWM vector modulation) |
| Interfaces / connectors | OKUMA proprietary connectors; internal serial CNC communication bus (OSP) |
| Built-in protections | Over-temperature, overcurrent, short circuit, undervoltage (typical) |
| Weight | ~3–8 kg |
| Dimensions | ~200×300×150 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
