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OKUMA Servo Drive
Brand: OKUMA -
Cat: Servo Drive
Code:BLII-D100A
| Combination name | Availability | Price |
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Servo Axis Drive Amplifier – OKUMA BLII-D100A
The BLII-D100A is a digital CNC axis servo drive amplifier (“Digital Axis Servo Drive Amplifier”) from the BL-II series, manufactured by OKUMA. The unit belongs to the second-generation brushless drive family developed by OKUMA for its proprietary OSP (Open System Platform) numerical control systems, and is documented on OKUMA CNC machining centres and lathes of the MA, MC, LB series and related models. It performs digital speed and torque regulation of the servo motor on the controlled axis, interfacing with the OSP proprietary bus and the motor encoder. The D100A suffix in the nomenclature identifies the current rating and variant within the series.
The axis servo drive amplifier is the electronic unit that converts CNC motion commands into power signals for the servo motor: it closes the speed and torque loop on each axis (X, Y, Z or rotary), enabling fast and geometrically precise positioning. Failure of the BLII-D100A renders the corresponding axis completely inoperative: the machine enters a safety fault state and cannot resume machining until the drive is replaced or repaired.
OKUMA is one of Japan’s leading CNC machine tool manufacturers, founded in 1898 in Nagoya. It designs and produces in-house both the machine tools and the CNC controllers (OSP series) as well as the motors and drives, ensuring full vertical system integration. Products in the BL-II series are legacy / discontinued in their original form: availability is limited to used parts, surplus stock, and specialist repair services.
Main Technical Specifications
| Type | Digital CNC axis servo drive amplifier (Digital Axis Servo Drive Amplifier) |
| Part number | BLII-D100A (BLIID100A) |
| Brand | OKUMA Corporation |
| Known application | OKUMA CNC machining centres and lathes, MA / MC / LB series (OSP control) |
| Function | Digital speed and torque regulation of CNC axis servo motor |
| Supply voltage | 200–240 V AC three-phase |
| Current rating | ~100 A peak / D100 classification |
| CNC interface | OKUMA OSP proprietary serial bus |
| Feedback | Incremental / absolute encoder from OKUMA servo motor |
| Connectors | Multiple OKUMA proprietary connectors (OSP bus, encoder, power) |
| Weight | ~2–5 kg |
| Dimensions | ~200–400 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
