KDA 3.2-150-3-A0S-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.2-150-3-A0S-U1 is a spindle drive and part of the KDA Spindle Drives series. It features a rated current of 150 Amps and operates with a DC supply voltage of 300 VDC. This unit uses a mounted heatsink blower for forced cooling and can be installed up to 1000 meters above sea level.
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Product Description:
The KDA 3.2-150-3-A0S-U1 spindle drive is built by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed as a dedicated power stage for high-speed machine-tool spindles, it converts a regulated DC bus into three-phase output under closed-loop velocity control supplied by an external controller. In automated machining centers, the unit supplies the motor with precisely regulated current so cutting speed remains stable during changes in material load. This arrangement lets an external motion controller set the target speed while the drive manages the motor-side power conversion. Stable spindle regulation is important in machine-tool duty because cutting conditions can change quickly as the tool enters or leaves the workpiece.
Internally, the converter links to a DC bus held at 300 VDC. Under that bus, the power stage can deliver a continuous output of 150 A, which is the maximum continuous output current available to the spindle motor from this drive. Cooling is handled by a mounted heat sink blower whose fan is supplied from a separate 115 V/50-60 Hz source, so airflow is not dependent on the main drive supply. The blower moves air across the heat sink to remove losses generated in the power section during sustained spindle operation. Safe operation is specified for ambient temperatures between 5 to 45 °C, and installation is permitted up to 1000 m above sea level without derating.
Control features are oriented toward straightforward integration. Speed reference enters as an analog voltage, and diagnostic or parameter data can be exchanged over a serial interface (RS 232 C) for setup and service access. The serial link provides a direct path for reading operating information and adjusting stored settings. The unit uses forced cooling, with the mounted blower matched to the heat sink profile so airflow remains constant regardless of cabinet circulation. This model is type 3 in the series and carries design version 2. No second encoder socket is provided, so wiring is limited to the primary feedback path.
Frequently Asked Questions about KDA 3.2-150-3-A0S-U1:
Q: What is the rated current of the KDA 3.2-150-3-A0S-U1 spindle drive?
A: The KDA 3.2-150-3-A0S-U1 has a rated current of 150 A, supporting high-power spindle applications.
Q: What cooling method is used in the KDA 3.2-150-3-A0S-U1?
A: The drive uses a mounted heatsink blower for cooling and operates with forced cooling to maintain optimal temperature.
Q: What voltage and frequency does the heatsink blower of the KDA 3.2-150-3-A0S-U1 require?
A: The AC source for the heatsink blower is 115V at 50-60Hz.
Q: What type of additional interface is available on the KDA 3.2-150-3-A0S-U1?
A: This spindle drive provides a serial interface (RS 232 C) for additional connectivity.
Q: What is the acceptable ambient temperature range for operating the KDA 3.2-150-3-A0S-U1?
A: The ambient operating temperature range for this model is 5 to 45 degrees Celsius.
