KDA 2.1-050-3-APS-U1 Bosch Rexroth Indramat
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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.
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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.
Frequently Asked Questions about KDA 2.1-050-3-APS-U1:
Q: What type of cooling system does the KDA 2.1-050-3-APS-U1 spindle drive use?
A: The KDA 2.1-050-3-APS-U1 spindle drive is equipped with a mounted heatsink blower for active cooling.
Q: What is the required DC supply voltage for the KDA 2.1-050-3-APS-U1?
A: This model requires a DC supply voltage of 300 VDC for operation.
Q: What is the rated current capacity of the KDA 2.1-050-3-APS-U1 spindle drive?
A: The KDA 2.1-050-3-APS-U1 supports a rated output current of 50 A.
Q: What additional interfaces are provided with the KDA 2.1-050-3-APS-U1?
A: A serial interface (RS 232 C) is available on this drive for additional connectivity.
Q: What is the permitted ambient temperature range for the KDA 2.1-050-3-APS-U1 spindle drive?
A: The KDA 2.1-050-3-APS-U1 can operate in ambient temperatures from 5 to 45 degrees Celsius.
