Product Description:

The KDA 2.1-050-3-AQ0-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts control commands from the machine tool controller into regulated armature current for high-speed machining spindles in milling or turning centers. This supports accurate speed regulation together with rapid torque response during changing cut conditions. It is intended for installations that require closed-loop spindle control instead of basic open-loop motor operation. The unit is series 2 in the KDA product line.

This unit draws a continuous motor armature current of 50 A. Its power section is supplied from a regulated DC bus at 300 VDC, which helps keep the current loops stable and speed control repeatable. A dedicated heat sink blower is energized from an auxiliary source of 115 V / 50–60 Hz, so airflow remains available independently of the main drive power. The unit uses forced cooling, which moves air across fin surfaces faster than natural convection. Speed reference signals are accepted as an analog command, allowing direct interface with legacy CNC controllers that use a ±10 V velocity set point. Separate blower power also lets the cooling path continue removing stored heat from the converter section after the main power stage is switched off.

Operation is allowed from 5 to 45 °C, so cabinet air must stay within that range during prolonged spindle cuts. The drive can be mounted at heights up to 1000 m above sea level without adjustment. A mounted heat sink blower is integrated into the rear panel, which avoids external ducting while directing airflow across the power devices. The drive has no additional interface option, so fieldbus connectivity or remote I/O must be handled by the machine controller instead of expansion cards inside the drive. This arrangement suits control cabinets where the controller manages communication functions and the drive is used as the spindle power stage.