KDA 3.2-050-3-DPS-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.2-050-3-DPS-U1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 50 Amps and operates with a DC supply voltage of 300 Volts. The drive uses a forced cooling mode with a mounted heatsink blower and supports a serial interface RS 232 C.
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Product Description:
The KDA 3.2-050-3-DPS-U1 is a drive module manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It converts a DC bus supply into three-phase output for high-speed machine-tool spindles, allowing the control system to adjust speed and torque during cutting, drilling, and grinding operations. Current control, speed-loop processing, and diagnostic functions are integrated into one housing. In spindle applications, the module supplies the regulated current needed for stable speed holding under changing load conditions, and it fits CNC machining centers as well as other production equipment that requires accurate spindle regulation.
The power stage operates from a DC link rated at 300 VDC, and it can deliver a continuous output of 50 A to the spindle motor. A mounted heat sink blower provides thermal regulation, and the fan is powered from a separate 115 V/50-60 Hz source so cooling can remain active even when the DC bus is discharged. The drive uses forced cooling to move air across the heat sink during repeated acceleration, rapid tool changes, and prolonged cutting cycles. Separating blower power from the main DC link helps maintain airflow during shutdown sequences and similar operating transitions. Speed references arrive as a 16-bit parallel word, which allows fine command resolution from the numerical controller without analog conversion noise.
System integration includes an RS-232C serial port for parameter access and fault interrogation from the CNC. A second encoder input supports spindle or auxiliary motor feedback for synchronized positioning tasks and closed-loop monitoring, which is useful when the spindle must align to a commanded angle. Operation is permitted from 5 to 45 °C at elevations up to 1000 m, provided that cabinet airflow and installation conditions remain within the intended range. The unit is part of Series 3, identifying its design generation within the KDA line.
