Product Description:

The KDA 2.1-100-3-LP0-U1 spindle drive comes from Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for high-speed machining centers, it converts shared DC-bus energy into controlled three-phase output while monitoring rotor position through encoder feedback. The module sends speed and torque commands to the spindle motor so the machine can maintain commanded cutting conditions during drilling, grinding, and milling cycles. By coordinating spindle behavior with the other motion axes, it supports accurate interpolation, stable speed regulation under changing load, and repeatable surface quality across automated machining tasks. This arrangement is suited to machine tools that need rapid acceleration, stable spindle orientation, and consistent torque delivery across repeated production cycles.

Electrically, the drive operates from a regulated link of 300 VDC and can supply up to 100 A to the connected spindle motor under continuous load. Thermal loading is handled by forced cooling, and the required airflow is supplied by a mounted heat-sink blower that runs on 115 V/50–60 Hz. Motion setpoints are delivered through the SERCOS interface, permitting deterministic communication with the CNC or PLC during coordinated machine movements. That communication link lets the controller update commands in real time while the spindle responds to changes in speed demand and process load. Because the blower is mounted directly on the heat sink, the cooling path is built into the drive and helps keep semiconductor junction temperatures within safe limits during prolonged high-speed cuts.

The unit operates in ambient temperatures from 5 to 45 °C and at installation sites up to 1000 m above sea level. When the machine requires synchronized positioning, a second encoder input allows the drive to process spindle feedback and an auxiliary motor scale at the same time without extra modules. In indexing or orientation functions, the extra feedback channel can support applications where spindle position must be aligned with another machine reference. The drive has no additional interface option, which keeps the communication layout straightforward and reduces the chance of protocol mismatches across a production line. It is a Series 2 version and uses the same mounting pattern and connector locations as earlier KDA drives, which helps it fit established cabinet layouts.