Product Description:

The KDA 3.2-100-3-DYS-U1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a dedicated axis amplifier, it delivers regulated three-phase power to high-speed machine-tool spindles and reports position through encoder inputs to the CNC controller. By integrating power conversion, speed command decoding, and cooling hardware in a single unit, the drive simplifies cabinet design for automated milling, drilling, or grinding systems. Its control functions support spindle operation that requires steady speed under changing cutting loads and reliable feedback for coordinated machine motion.

The power stage is energized from a direct-link bus at 300 VDC, and it can supply the motor windings with a continuous line current of 100 A, giving the connected spindle a wide torque range during cutting. Speed reference data reaches the control board as a 16-bit digital parallel word, allowing fine velocity setting resolution. Diagnostic and parameter access are handled over an RS-232-C serial interface, so fault codes can be retrieved without network hardware. Thermal management relies on forced cooling, meaning cabinet air is actively pulled across the finned heat sink rather than relying on natural convection. A secondary encoder socket and a synchronous input are present, allowing an auxiliary position transducer to support a dual-loop feedback arrangement when higher accuracy is required.

The cooling assembly uses a mounted heatsink blower fed by an auxiliary supply of 115 V / 50–60 Hz, so airflow remains stable even when the DC bus is de-energized. Rated performance is maintained in ambient temperatures from 5 to 45 °C, provided the installation altitude does not exceed 1000 m above sea level. Above that altitude, derating is recommended to offset thinner air. Within these limits, the series 3, version 2 platform keeps switching losses controlled while the forced-air path helps prevent heat buildup in adjacent components.