Product Description:

The KDA 2.1-100-3-DPI-W1 is a drive module manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It regulates spindle speed and torque in CNC machining centers and other high-speed manufacturing equipment. The module converts DC bus energy into controlled three-phase output for the motor.

The power stage operates from a DC link of 300 VDC, so the upstream supply or common bus must maintain that level to keep the inverter within its switching margins. Under continuous duty, the converter can deliver a phase current of 100 A, which is the maximum permissible spindle load before the drive enters current limitation. Thermal energy is removed by a heat sink that uses forced cooling, and an integrated fan draws air through the fins to preserve semiconductor junction temperatures. That blower is fed from an auxiliary line of 220 V/50–60 Hz, separating its power from the DC link and allowing operation even when the main bus is de-energized. Commanded speed reaches the control board as a 16-bit digital parallel word, enabling high-resolution setpoint updates from the CNC controller without analog drift.

Installation requirements are moderate: the unit is specified for ambient temperatures between 5 to 45 °C, and it maintains full current capability up to 1000 m elevation without derating, covering most shop-floor environments. For position and velocity feedback, it provides an incremental encoder output that can retransmit spindle position to ancillary axes or supervisory PLCs. A dedicated second encoder input is also available, so the same drive can process either spindle feedback or an additional motor sensor, which simplifies retrofit scenarios where dual-loop control is desired. The mounted heat sink blower keeps the mechanical envelope compact because no external ducting or liquid lines are necessary, and the Series 2 platform shares this layout across different current levels.