Product Description:

The Bosch Rexroth Indramat KDA 2.1-050-3-D0D-W1 belongs to the KDA Spindle Drives series produced for numerically controlled machine tools. Classified as a spindle drive, it receives its DC-link energy from a shared supply and modulates that energy into a three-phase output whose frequency and amplitude vary with commanded speed. In this role, the unit forms the electrical backbone of high-speed milling, drilling, or grinding spindles where precise torque delivery and rigid velocity control are required.

Power for the converter stage comes from a common bus held at 300 VDC, and the drive can continuously deliver 50 A of armature current to the motor windings under rated conditions. Thermal management is handled by a mounted heat-sink blower fixed directly to the aluminum cooling element; this arrangement forces ambient air through the ribbed surface to remove switching and copper losses. A dedicated controller governs the blower’s duty cycle, but airflow is guaranteed through forced cooling, so component temperatures remain within limits during prolonged acceleration cycles. The fan motor draws its energy from an auxiliary tap rated at 220 V/50–60 Hz, so cabinet wiring remains simple and isolated from the DC bus. Motion data enter the unit through a 16-bit parallel digital speed-command port, delivering velocity setpoints without analog offset.

For installation planning, the ambient operating window spans 5 to 45 °C, and continuous ratings are maintained at heights up to 1000 m above sea level without additional derating. When applications demand precise spindle positioning for tool change or threading, the drive also listens to a digital position command value channel that complements the primary speed word. Because the hardware does not feature a second encoder input, rotor feedback must be supplied through the main encoder path used by the machine controller. The Series 2 control logic also supports shared-bus machine layouts with coordinated spindle commands.