KDA 3.1-100-3-LPI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-LPI-U1 is a spindle drive in the KDA Spindle Drives series with a rated current of 100 Amps and a DC supply voltage of 300 VDC. It features forced cooling via a mounted heatsink blower that operates on 115V AC and 50-60Hz. The drive includes a SERCOS interface for speed command and supports a second encoder input for spindle or motor feedback.
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Product Description:
The KDA 3.1-100-3-LPI-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for generation-3 control racks, it regulates the torque and speed of high-frequency machine-tool spindles connected to Indramat power supplies. By converting a stabilized DC link into three-phase output, the unit provides precise velocity loops required in metal-cutting, grinding, and similar automated processes. This product type is a spindle drive within the motion-control hierarchy, bridging the servo controller and the motor while accepting digital speed commands from upstream CNC or PLC equipment. Its control role allows the spindle to respond quickly to commanded speed changes during cutting, dressing, and other machine cycles.
The drive draws its main power from a 300 VDC bus shared with the KDA supply module, and it can deliver a continuous output of 100 A to the spindle windings. For thermal management, the integrated heatsink blower is powered from a single-phase 115 V/50–60 Hz auxiliary line. Air is pulled across the aluminum fins by forced cooling, helping keep the internal semiconductor temperature within a safe operating range at full current. Motion commands are fed through the SERCOS interface, allowing deterministic fiber-optic communication with the machine controller. This arrangement supports consistent command timing and helps the drive maintain stable spindle regulation during demanding machining duty.
The permitted ambient range is 5 to 45 °C, and the mounted heatsink blower supports continuous airflow within that temperature window. Installation is permitted up to 1000 m above sea level, so altitude-related derating is unnecessary in standard factory elevations. An incremental encoder output is available for downstream position monitoring, and a second encoder input can be assigned to spindle feedback or to an additional motor feedback loop when tandem axes share the same inverter. This interface arrangement lets the drive pass actual speed data while also supporting a secondary feedback circuit when needed. The added feedback path can be used where coordinated spindle behavior and closed-loop monitoring are required inside the same control system.
Frequently Asked Questions about KDA 3.1-100-3-LPI-U1:
Q: What type of cooling system does the KDA 3.1-100-3-LPI-U1 spindle drive use?
A: The KDA 3.1-100-3-LPI-U1 uses a mounted heatsink blower for forced cooling, ensuring efficient thermal management.
Q: What additional interface is provided with the KDA 3.1-100-3-LPI-U1?
A: This drive supports an additional interface with an incremental encoder output.
Q: What is the specified operating ambient temperature range for the KDA 3.1-100-3-LPI-U1?
A: It can operate within an ambient temperature range of 5 to 45 degrees Celsius.
Q: What interface is used for speed command on the KDA 3.1-100-3-LPI-U1?
A: The speed command value for this model is set using a SERCOS Interface.
Q: What is the rated current of the KDA 3.1-100-3-LPI-U1 spindle drive?
A: It is rated for a current of 100 A during operation.
