KDA 2.1-150-3-APD-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-150-3-APD-U1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 150 Amps and operates on a 300 VDC supply voltage. The drive uses forced cooling with a mounted heatsink blower and supports an ambient temperature range of 5 to 45 degrees Celsius.
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Product Description:
The KDA 2.1-150-3-APD-U1 is a chassis-mounted unit from the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. It serves as the final power stage for machine-tool spindles, shaping the current waveform that the motor receives while monitoring feedback channels for rotational accuracy. By integrating into a common DC bus system, the drive supports multi-axis installations where synchronized speed control and rapid acceleration of cutting spindles are critical to machining throughput. The chassis format is intended for cabinet integration, where the power section can operate alongside companion modules on the same bus structure.
Electrically, the module draws energy from a stabilized DC link rated at 300 VDC, and it can deliver up to 150 A of continuous output current to the spindle windings. Thermal management is handled by a mounted heat sink blower that operates on an auxiliary source of 115 V/50-60 Hz, pushing air directly across the power semiconductors. This arrangement uses forced cooling, permitting full current delivery inside tightly packed control cabinets. Speed references enter through an analog command channel, so the numerical control can modulate spindle velocity with high resolution while the drive maintains the internal current loop. This combination supports stable spindle response during speed changes and load transitions.
The unit is intended for ambient conditions from 5 to 45 degrees Celsius and installation heights up to 1000 m above sea level. For motion applications, it offers a digital position command value interface that complements the analog speed loop and supports direct profile generation in functions such as rigid tapping. A dedicated secondary encoder port for spindle feedback or additional motor feedback accepts signals from an incremental or absolute transducer, supplying the higher-level control with accurate speed and position data during cutting and orienting phases. This extra feedback path also supports closed-loop spindle positioning when the process requires a defined angular stop.
