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Digital Compact Servo Drive – BAUMÜLLER BKF12/50/400-2002
The BKF12/50/400-2002 is a digital compact servo drive (“Digital Compact Servo Drive”) from the BKF series, manufactured by Baumüller, designed to control synchronous and asynchronous AC servo motors in advanced industrial automation applications. The unit is typically installed in CNC machine tools, injection moulding machines for plastics, textile machines, and printing machinery equipped with Baumüller drive systems. It closes the current, speed, and position control loops, interfacing with the numerical controller via analogue speed reference and digital I/O. The suffix -2002 identifies a specific hardware/firmware revision of the series.
The servo drive is the heart of the axis motion system: it receives the position or speed reference from the CNC, processes the feedback signal from the encoder or resolver mounted on the motor, and generates the current required to drive the motor windings to follow the programmed trajectory with precision. A drive failure causes immediate loss of control on the affected axis, rendering the machine inoperable; in multi-axis systems the CNC may raise a general alarm on all axes to protect both the machine and the workpiece in progress.
Baumüller is a German company founded in 1930 in Nuremberg, specialising in electric drive systems, servo motors, and precision industrial automation; its products are present worldwide in the machine tool, plastics, textile, and printing sectors. The BKF series belongs to a previous generation of compact digital drives, now superseded by the b maXX next-generation families: all products in this family are therefore legacy / discontinued, available only as used, NOS surplus, or through specialist repair services.
Main Technical Specifications
| Type | Digital compact servo drive (Digital Compact Servo Drive) |
| Part number | BKF12/50/400-2002 (BKF12504002002) |
| Brand | Baumüller (Baumüller Nürnberg GmbH) |
| Known application | CNC machine tools, injection moulding machines, textile and printing machinery with Baumüller drive systems |
| Function | Current, speed and position regulation for synchronous/asynchronous AC servo motors |
| Rated output current | 12 A (rated, from part number) |
| Peak current | 50 A (peak, from part number) |
| Supply voltage | 3×400 V AC, 50/60 Hz |
| Feedback | Incremental encoder / resolver (typical for BKF series) |
| Reference input | Analogue ±10 V; digital I/O |
| Fieldbus options | SERCOS, PROFIBUS DP (typical BKF series) |
| Weight | ~3–6 kg |
| Dimensions | ~200–350 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |