Product Description:

The KDA 2.1-050-3-L0S-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. As a spindle drive, it regulates rotational speed and torque for high-speed machining spindles. It links the machine controller to the servo motor section while providing power conversion and diagnostic feedback in automated production lines.

This unit draws a continuous motor output current of 50 A, which is the maximum sustained load the internal power stage can deliver without thermal derating. The power section is supplied from a regulated DC bus at 300 VDC, so it pairs with intermediate-circuit converters that share this voltage level on multi-axis systems. A dedicated heat sink blower is energized from an auxiliary line rated at 115 V/50–60 Hz. This keeps the cooling fan electrically separate from the DC bus and helps maintain stable airflow. Parameter adjustments and service data can be exchanged through a RS-232-C serial link, allowing point-to-point communication with a host computer or diagnostic terminal. Thermal energy is removed by forced cooling, which maintains component temperatures below critical limits during long duty cycles at elevated spindle speeds.

Commanded speed references are accepted over a SERCOS interface, enabling deterministic position and velocity control inside synchronous real-time networks. Installation is permissible up to 1000 m above sea level; above this height, the cooling air density drops and reduces heat transfer efficiency. Reliable function is permitted within an ambient range of 5 to 45 °C, which covers typical factory environments without additional climate control. The unit uses a mounted heat sink blower that directs airflow across the fin stack rather than relying on cabinet ventilation, shortening the thermal path from semiconductor junctions to ambient air and supporting continuous operation near the rated electrical limits.