Product Description:

The KDA 2.1-150-3-AP0-W1-220 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is a Series 2 unit. It receives regulated DC power from the machine’s common bus and delivers phase-controlled output to a machining spindle. This lets CNC systems impose precise velocity and torque profiles on cutting or grinding tools during automated production. In machine tools, that kind of control supports stable speed changes during cutting passes and other programmed spindle actions. It is intended for spindle applications that require repeatable torque response under varying load.

The drive operates from a DC link of 300 VDC and can supply up to 150 A to the spindle windings, so inverter sizing and cable gauges must match this continuous current capability. Thermal energy created by those currents is removed by a mounted heat sink blower, and airflow is produced with an integral fan that runs from a separate 220 V/50–60 Hz AC source. That blower works in forced cooling mode, meaning heat is expelled even when the spindle is idle and internal temperatures remain controlled during low-speed operation. A second encoder input is provided so the controller can accept dedicated spindle feedback or additional motor feedback for orienting tasks such as tool change positioning.

The unit is specified for environments between 5 to 45 °C, enabling installation in typical shop-floor enclosures without supplemental conditioning, and it maintains full ratings up to 1000 m above sea level, where reduced air density still permits adequate cooling. Speed commands are received as an analog signal, simplifying integration with legacy CNC controls that use voltage-based references instead of digital communication. The unit has no additional interface option, so only power, command, and feedback wiring are required. The simplified interface set suits control schemes that already provide the necessary analog command and encoder channels.