Product Description:

The KDA 2.1-150-3-DYI-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is used in industrial automation to energize and regulate motorized spindles, providing controlled acceleration, stable running speed, and rapid deceleration during machining cycles. The unit translates digital speed references from the CNC into regulated three-phase power while coordinating encoder feedback for closed-loop control of the cutting process. This control method helps the spindle hold commanded speed when cutting loads change during machining.

This drive can deliver a continuous output of 150 A without exceeding thermal limits. Its DC bus requires 300 VDC, so the machine power supply must maintain that level for stable operation. The heat sink blower is powered by an auxiliary source rated at 220 V, 50/60 Hz, which allows cooling to continue even when the main power stage is disabled. Heat is removed by forced cooling, allowing high current density while keeping semiconductor temperatures within a safe operating range. Speed references are accepted as a 16-bit parallel digital word, which gives the spindle fine command resolution during contouring or tapping cycles.

A mounted heat sink blower is installed on top of the housing and moves air across the fins when cabinet air is stagnant. The electronics remain functional from 5 °C to 45 °C, which matches typical shop-floor ambient conditions. Installation is permitted up to 1000 m above sea level; at higher elevations, reduced air density can lower cooling performance. For position verification, the additional interface provides an incremental encoder output. A second encoder input and a synchronous input are also present for applications that require dual-loop feedback or master-follower spindle coordination.