Product Description:

Bosch Rexroth Indramat designs the KDA 3.1-150-3-LPI-U1 for use in the KDA Spindle Drives series. The unit is a spindle drive that regulates three-phase induction or synchronous spindles in machining centers, grinding machines, and other high-speed tooling stations. By converting the shared DC bus energy into controlled armature power, it delivers precise torque, executes rapid speed transitions, and relays position data between the motion controller and the spindle motor. The compact housing installs on standard mounting rails inside automation cabinets.

The power section accepts a DC link of 300 VDC and can deliver up to 150 A of continuous output current to the connected spindle. Thermal management relies on a mounted heatsink that is flushed by a blower fed with 115 V, 50–60 Hz single-phase power; this scheme, identified as forced cooling, keeps semiconductor junction temperatures within safe limits during heavy cutting duty. Velocity setpoints enter the drive over the SERCOS Interface, allowing deterministic fiber-optic communication with CNC processors. Current sensors, field-oriented control, and the selected bus voltage together establish a stable speed loop across the entire mechanical load range.

Environmental limits support installation in workshops from 5 to 45 °C and up to 1000 m above sea level without derating. For process monitoring, the control board exposes an incremental encoder output that mirrors spindle position to external displays or auxiliary axes. A second encoder input accepts additional spindle or motor feedback, enhancing synchronization for multi-motor arrangements. Hardware identification classifies the unit as Series 3, ensuring parameter files, firmware, and spare components align with other third-generation KDA modules.