Product Description:

The KDA 3.2-050-3-A0S-U1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Version 3.2 is intended to supply regulated three-phase power to high-speed machining spindles while coordinating speed with the machine controller. By converting the common 300 V DC link of an Indramat drive package into controlled output for the spindle motor, the unit serves as the central power stage for metal-cutting and forming centers that require rapid acceleration and deceleration. This operating role supports machine tools that depend on stable spindle speed during changing load conditions.

The drive is energized from a DC bus of 300 VDC, and its motor terminals can deliver a continuous phase current of 50 A. A dedicated heat sink blower is powered independently from the control circuits by an AC source rated at 115 V, 50/60 Hz, which allows the fan to remain active even when the DC link is discharged. Thermal stability is maintained through forced cooling with a mounted heat sink blower. This airflow helps the power transistors sustain load without thermal derating during rapid spindle ramp-ups.

For plant integration, the allowable ambient temperature range is 5 to 45 °C, and installation is permitted at elevations up to 1000 m above sea level without altitude correction. Command data enter through an analog speed reference, and diagnostic or parameter data can be exchanged over the serial interface (RS-232C). The analog velocity channel uses ±10 V scaling for speed loops, and digital feedback is limited to a single encoder path because this model does not include a second encoder input. Speed setpoints are identified as analog, which matches conventional CNC controllers that issue continuous voltage commands. This arrangement supports control systems that rely on voltage-based speed commands and serial access for operating data.