Product Description:

The KDA 2.1-050-3-L0D-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Designed for integration with high-speed machining spindles, the unit converts a regulated DC bus into three-phase motor power while coordinating velocity and position commands within CNC systems. By providing closed-loop speed control, it serves as the axis-specific power stage in modular Indramat automation racks, and it is a Series 2 device within the line.

The drive operates from a DC bus of 300 VDC and can deliver a continuous phase current of 50 A, allowing it to energize medium-frame spindle motors without saturation. Thermal energy is extracted by a mounted heat sink blower; this assembly pushes air directly across the fin stack in a forced cooling configuration so cabinet temperature does not limit duty cycle. The blower itself is powered from an auxiliary AC feed of 115 V at 50/60 Hz, eliminating the need to tap the control supply. These electrical and cooling characteristics support sustained high-speed operation during prolonged cutting cycles.

The unit maintains full ratings within an ambient range of 5 to 45 degrees Celsius and at elevations up to 1000 m above sea level, so most shop floor environments require no derating. Command data reach the drive through a SERCOS interface for speed setpoints, while a separate channel accepts a digital position command value, supporting combined speed and position loops. A second encoder socket is not present, simplifying wiring when only motor feedback is needed. The absence of an additional encoder input reduces component count yet still permits precise spindle orientation through the embedded evaluation of the primary transducer, allowing the drive to fit into existing Indramat amplifier rows without mechanical modification.