Product Description:

The KDA 2.1-050-3-D0S-U1 is a spindle drive module from the KDA Spindle Drives series by Bosch Rexroth Indramat. As a dedicated spindle drive, it converts rectified DC power from a supply module into controlled three-phase output for high-speed machine-tool spindles. This lets the connected spindle respond accurately to commanded speed changes and torque demand during cutting, drilling, and similar machining processes. The unit is in series 2 and is intended for rack installations that support continuous-duty operation. In multi-module drive cabinets, it works as the spindle-specific power stage rather than as a general-purpose axis controller.

The drive's cooling fan requires an external 115 V / 50/60 Hz supply, so cabinet wiring must provide that single-phase source. Its power stage operates from a 300 VDC link supplied by the power module, and the current regulators support a continuous output of 50 A. Speed commands are transmitted through a 16-bit parallel digital interface, which provides precise setpoint resolution without the signal drift associated with analog references. Thermal management uses a mounted heat-sink blower to move air across the power electronics during spindle acceleration and steady running. This cooling arrangement helps the module remain stable when spindle load changes quickly during repeated machining cycles.

The drive uses forced cooling so airflow remains constant during operation. It can operate in ambient temperatures from 5 to 45 °C, and installation is permitted up to 1000 m above sea level. A built-in RS-232C serial interface allows parameter access and diagnostic communication with a host control. The second encoder input is not included, which simplifies wiring when only primary position feedback is required. This layout suits spindle systems that rely on a single main feedback channel for closed-loop control.