Product Description:

The KDA 3.2-050-3-A0I-U1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. In an automation cell, it supplies regulated power to high-speed motorized spindles, translating numeric control commands into precise shaft torque and velocity during machining processes. The drive forms part of a modular system that interfaces directly with compatible power supplies and motion controllers for drilling, grinding, and similar machine-tool applications. Because it works as a dedicated spindle drive, it is suited to applications where stable speed regulation and repeatable torque response are necessary for surface finish and tool performance.

Its power stage draws a DC link voltage of 300 VDC, allowing the unit to modulate spindle current without an onboard rectifier. The continuous output capability is 50 A, so connected motors can receive stable current during sustained cutting cycles and extended acceleration periods. Thermal loading is managed by a mounted heat sink blower that forces air across the fin pack, and this arrangement provides forced cooling to keep semiconductor junctions within limits. The blower is supplied from a separate 115 V, 50/60 Hz source, which keeps airflow available independently of the DC link. Separating the fan supply from the main power stage also helps cooling remain active during brief supply interruptions or bus fluctuations.

The unit is rated for ambient temperatures between 5 to 45 °C, and full performance is maintained up to 1000 m above sea level without derating. It accepts an analog command value input, converting CNC voltage signals into spindle speed commands. Position feedback connectivity includes an incremental encoder output for downstream monitoring, while the second encoder socket is omitted when only one feedback loop is needed. The unit is series 3 and version 2. Operation outside the stated temperature or altitude limits can reduce available current.