Product Description:

The KDA 2.1-050-3-AP0-W1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. The unit converts a fixed DC bus into a variable AC output to regulate high-speed machining spindles in automated tools. As a dedicated spindle drive, it supplies controlled current to an induction or synchronous spindle motor in response to velocity commands, providing closed-loop speed control within integrated motion systems.

The heat sink blower runs from an auxiliary supply of 220 V/50–60 Hz; using a separate source prevents cooling performance from dropping during DC bus dips. Internally, the power electronics draw from a regulated bus of 300 VDC, giving the drive the voltage headroom required for rapid spindle acceleration. Continuous motor demand is supported by a rated output of 50 A, a current level suited to medium-power spindles common in milling and grinding centers. Thermal management relies on forced cooling, so airflow is maintained regardless of cabinet convection. The speed reference uses an analog command, allowing a standard ±10 V signal from the CNC or PLC to set spindle velocity without digital fieldbus overhead.

Operation is specified for ambient temperatures from 5 to 45 °C, ensuring electronic components stay within design limits in typical workshop environments. Installation heights can reach 1000 m above sea level without derating, supporting machine placement on elevated production floors. Cooling air is delivered by the integrated mounted heat sink blower, which directs the forced stream across power semiconductors so the unit can hold current at nominal values. A second encoder input is available when spindle feedback and additional motor feedback must be processed simultaneously, extending position accuracy for orienting or C-axis tasks. No additional interface option is present, simplifying configuration and trimming unused communication hardware from the cabinet.