Product Description:

The KDA 3.2-100-3-DPI-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series, version 3.2. It is installed in modular drive racks alongside a common DC supply and is used to control high-speed machine tool spindles. By supplying controlled three-phase output and monitoring encoder feedback, the module regulates spindle speed, acceleration, and deceleration so that cutting, drilling, and grinding processes follow programmed setpoints. This arrangement is suited to machine tools that use centralized power distribution and separate drive modules for coordinated motion control.

The power stage operates from a shared DC bus at 300 VDC, and it can provide a continuous phase current of 100 A to the connected motor. Thermal load is managed by a mounted heat sink blower that directs cooling air across the internal fins, and the fan is supplied from a separate 115 V, 50/60 Hz source. Because the unit uses forced cooling, it can maintain rated output during demanding machining cycles without early thermal cutback. The separate fan supply allows the cooling circuit to operate independently of the main power stage. The main control board also includes a second encoder socket for spindle position feedback or additional motor feedback, which supports spindle orientation and electronic gearing functions.

Operation is permitted in ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level without derating. Speed commands are received as a 16-bit parallel digital word, allowing the controller to send exact reference values without analog drift. An incremental encoder output is available for external monitors or PLC high-speed counters that require real-time shaft-speed data. These signal paths support synchronized machine functions such as orientation checks, speed supervision, and coordination with upstream numerical control hardware.