KDA 3.1-050-3-LQI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-050-3-LQI-U1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 50 Amps, forced cooling with a mounted heatsink blower powered at 115V, and operates within an ambient temperature range of 5 to 45 degrees Celsius. The drive supports a SERCOS interface for speed command values and includes an incremental encoder output.
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Product Description:
The KDA 3.1-050-3-LQI-U1 is a spindle drive built by Bosch Rexroth Indramat for the KDA Spindle Drives series. In machine tools and high-speed machining centers, the unit converts regulated DC-bus energy into three-phase output for precision spindle motors while maintaining communication with the supervisory CNC. It supports coordinated torque and speed control across multiple axes in modular drive systems. Because the drive works within a shared motion platform, it can exchange command and status data without relying on separate analog reference wiring. This helps the spindle respond consistently during acceleration, steady cutting, and commanded speed changes.
This model draws its intermediate-circuit power from a 300 VDC supply and can deliver a continuous phase current of 50 A to the connected spindle motor. Thermal energy produced during intensive cycles is removed by a mounted heat sink blower, and the blower is powered by a dedicated 115V/50-60Hz AC source so airflow remains independent of the DC link. Velocity references reach the drive through the SERCOS interface, allowing deterministic fiber-optic command values to be processed without analog drift. Closed-loop regulation is assisted by fast current controllers that support stable spindle response during changing loads. The separation between the DC-link supply and the blower supply helps cooling remain active during extended operating periods.
An additional diagnostics channel is available through an incremental encoder output, making real-time spindle position data available to external evaluation hardware. Environmental limits permit operation between 5 to 45 °C and allow installation up to 1000 m above sea level before derating is required. The cooling method is forced cooling, so rated performance assumes continuous fan operation. The encoder signal can also support external monitoring equipment that needs live position data during spindle operation. These operating limits fit typical indoor industrial environments where stable thermal behavior and continuous motion control are required.
Frequently Asked Questions about KDA 3.1-050-3-LQI-U1:
Q: What is the rated current for the KDA 3.1-050-3-LQI-U1 spindle drive?
A: The KDA 3.1-050-3-LQI-U1 spindle drive supports a rated current of 50 A.
Q: How is the KDA 3.1-050-3-LQI-U1 spindle drive cooled?
A: Forced cooling is achieved using a mounted heatsink blower on this model.
Q: What is the ambient temperature operating range of the KDA 3.1-050-3-LQI-U1 spindle drive?
A: The drive is designed for environments ranging from 5 to 45 degrees Celsius.
Q: Which interface is used for speed command on the KDA 3.1-050-3-LQI-U1 spindle drive?
A: SERCOS Interface is used for the speed command value on the KDA 3.1-050-3-LQI-U1.
Q: What is the AC source specification for the heatsink blower of the KDA 3.1-050-3-LQI-U1?
A: The AC power source for the heatsink blower is 115V at 50-60Hz on this unit.
