Product Description:

The KDA 2.1-050-3-A00-U1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It conditions the shared DC link energy in a multi-axis rack and produces controlled three-phase output for high-speed machine-tool spindles. Within automated machining centers, the unit translates velocity commands from the numerical controller into precise torque so cutting, drilling, or grinding operations hold their programmed surface speeds and feed rates. The drive is intended for spindle service rather than general axis positioning, so its control behavior is aimed at maintaining commanded rotational speed.

The drive’s power electronics are supplied by a 300 VDC intermediate circuit, enabling the current regulator to furnish up to 50 A of continuous phase current to the spindle motor. Thermal energy generated by this load is removed through a mounted heat sink blower, and the blower itself is energized from a 115 V/50–60 Hz auxiliary source so cabinet wiring remains simple. Because the airflow is directed across the fins, the unit uses forced cooling, allowing its rated output to be maintained during heavy duty cycles. Command signals are accepted as an analog speed reference, letting a CNC issue ±10 V setpoints without additional protocol converters. This input method allows straightforward integration with controls that use conventional voltage commands.

Continuous operation is permitted only from 5 to 45 °C, so enclosures may require conditioned airflow in hotter facilities. Altitude is restricted to 1000 m above sea level because reduced air density weakens forced-air cooling. The unit has no additional interface option, and the controller also omits a second encoder channel, which keeps the available feedback arrangement fixed. The missing second encoder input prevents direct connection of an additional feedback device through the base configuration.