KDA 2.1-050-3-APS-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-APS-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 50 Amps and a DC supply voltage of 300 VDC. It features forced cooling through a mounted heatsink blower powered by a 115V 50-60Hz AC source. The drive also offers a serial RS 232 C interface and a second encoder input for spindle or additional motor feedback.
Internal Product Review
The KDA 2.1-050-3-APS-U1 spindle drive from Bosch Rexroth Indramat features a rated current of 50 A and operates on a 300 VDC supply voltage, delivering dependable power for demanding spindle applications. Forced cooling with a mounted heatsink blower and an AC source of 115V/50-60Hz ensure effective thermal management and system longevity. The integrated serial interface (RS 232 C) enables straightforward communication, making this drive a solid choice for precision spindle control systems.
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Product Description:
The KDA 2.1-050-3-APS-U1 is a drive module from Bosch Rexroth Indramat that belongs to the KDA Spindle Drives series. It is a dedicated drive for spindle control, transforming the shared DC bus energy of a multi-axis system into regulated three-phase power so a machining center or grinding head can accelerate, hold speed, and decelerate with repeatable accuracy. Integrated control and power stages reduce panel wiring. In a shared-drive cabinet, this lets the spindle channel work alongside companion axis modules without requiring a separate standalone inverter enclosure. That arrangement suits machine tools that need stable spindle behavior during cutting, drilling, and finishing passes.
Its internal power section is energized from a 300 VDC bus, and the output bridge is rated for a continuous draw of 50 A to match medium-frame spindle motors. Thermal loading is managed by a mounted heat sink blower that receives supply power at 115 V at 50–60 Hz, pushing air directly across the semiconductor assemblies. Because airflow is actively directed, the drive uses forced cooling to sustain full current during prolonged roughing cuts. The stabilized DC link helps the spindle respond quickly to load changes while maintaining controlled speed behavior across the operating range. Directed airflow also helps remove heat from the power semiconductors during long production runs with repeated acceleration and deceleration.
Environmental limits allow operation from 5 to 45 °C, and no output derating is required for installations up to 1000 m above sea level. Diagnostic and parameter data can be exchanged through the embedded serial interface (RS-232-C). Velocity commands are accepted as an analog speed command value from the machine controller, and a secondary encoder socket is available for spindle feedback or an additional motor channel. This communication path supports parameter access and fault review without requiring a separate external interface module. The extra feedback connection can simplify layouts where the machine must monitor another rotating element near the main spindle.
