KDA 2.1-050-3-API-U1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Bosch Rexroth Indramat KDA 2.1-050-3-API-U1 is a spindle drive from the KDA Spindle Drives series. It operates with a DC supply voltage of 300 VDC and a rated current of 50 Amps. The drive uses a mounted heatsink blower for forced cooling and supports an ambient temperature range of 5 to 45 degrees Celsius.
Internal Product Review
The KDA 2.1-050-3-API-U1 is a spindle drive from the KDA series by Bosch Rexroth Indramat, designed for high power applications with a rated current of 50 A and a 300 VDC supply. Forced cooling is achieved with a mounted heatsink blower, ensuring reliable thermal management in demanding environments. The integrated incremental encoder output makes this spindle drive especially suitable for precise control applications.
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Product Description:
The KDA 2.1-050-3-API-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a Series 2 unit, it controls asynchronous or synchronous spindles in milling centers and lathes through a closed-loop architecture connected to encoder feedback. The drive supplies regulated three-phase energy from a shared DC bus while maintaining commanded spindle speed during cutting, drilling, or turning operations. Encoder feedback lets the control loop compare actual spindle motion with the commanded value, which helps the system correct speed changes caused by varying chip load or tool engagement.
Power for the drive section is taken from a DC link rated at 300 VDC, and the converter can deliver a continuous phase current of 50 A to the spindle motor. Thermal management relies on a mounted heat sink blower powered by a dedicated 115 V/50–60 Hz source, which forces air across the fins to remove switching losses from the power stage. Safe operation is permitted within an ambient range of 5 to 45 °C, allowing installation in typical machine enclosures without separate refrigeration equipment. This cooling arrangement supports continuous spindle duty where sustained current and switching activity generate steady internal heat.
The KDA 2.1 design supports motion feedback and command integration through a dedicated incremental encoder output that passes position information to a master controller. A second encoder input is available for spindle or auxiliary motor feedback when additional feedback channels are needed, and the speed reference enters the drive as an analog speed command value. The analog reference path suits control systems that issue a voltage-based speed request rather than a network command. Installation is permitted up to 1000 m above sea level without derating, so the unit can be used in standard industrial locations at moderate elevation.
