Product Description:

The KDA 3.2-050-3-AY0-U1 is a spindle drive module produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Intended for integration in automation cabinets, the unit acts as the power stage between a system power supply and a high-speed machine-tool spindle. By monitoring current, voltage, and rotor position, the drive maintains commanded spindle speed, supports rapid acceleration, and enables process-consistent torque delivery required for metal-cutting, grinding, and other precision machining tasks.

The power section is energized by a regulated bus of 300 VDC. From this bus, it supplies up to 50 A of armature current, giving the connected spindle ample torque over a wide speed range. Thermal energy produced by the power semiconductors is removed by a mounted heat sink blower that draws its own supply from 115 V/50-60 Hz, which avoids loading the DC link. Speed reference data enter the controller as an analog voltage, so standard CNC control cards can dictate spindle velocity without digital fieldbus hardware. Internal monitoring compares the actual speed feedback with the analog command and adjusts the output current in real time to hold the specified setpoint.

The cooling hardware uses forced cooling, so airflow across the fins remains constant even when the cabinet temperature fluctuates. Reliable operation is specified for an ambient range of 5 to 45 degrees Celsius, and performance remains unchanged up to 1000 m above sea level; beyond that altitude, derating may be necessary. For applications requiring dual-loop feedback, a second encoder input and a synchronous input are available, allowing the drive to reconcile motor-mounted encoder data with an external position transducer. The unit does not include additional communication interfaces, so control is handled through its electrical and feedback connections.