KDA 2.1-100-3-LYI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-100-3-LYI-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 100 Amps and a DC supply voltage of 300 VDC. It utilizes forced cooling with a mounted heatsink blower powered by a 115V AC source and features incremental encoder output along with a second encoder and synchronous input. The drive operates within an ambient temperature range of 5 to 45 degrees Celsius and supports SERCOS Interface for speed command values.
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Product Description:
The KDA 2.1-100-3-LYI-U1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Used in automated machining centers and similar equipment, the unit converts a stabilized DC bus into a three-phase output that precisely modulates torque and speed on the connected spindle motor. By integrating with motion controllers and encoder feedback, it maintains constant spindle velocity under load swings, which is critical for surface finish and dimensional accuracy. This operating behavior helps the spindle hold commanded speed during drilling, milling, and boring cycles. Stable speed regulation reduces variation when the cutting load changes as the tool enters or exits the workpiece.
Internally, the drive is energized from a 300 VDC intermediate circuit supplied by a shared power supply unit. From this rail, it can deliver up to 100 A of continuous motor current, enough for large-frame synchronous or induction spindles. Thermal management is handled by a mounted heat sink blower that pushes air directly across the power semiconductors. The blower is rated at 115 V/50–60 Hz and operates with forced cooling so full output can be maintained without derating. This airflow arrangement focuses cooling on the power section instead of relying only on cabinet ventilation. To aid motion coordination, the front panel offers a second encoder input and a synchronous capture input for integration with higher-level control hardware.
The permissible ambient operating window is 5 to 45 °C, and installation is supported up to 1000 m above sea level. Velocity references are supplied over the deterministic SERCOS interface, allowing the spindle command value to be updated in real time within a fiber-optic ring. For auxiliary axis control or diagnostic monitoring, the unit also provides an incremental encoder output that mirrors spindle position to downstream drives or CNC controllers. This output can be used where external control equipment needs a synchronized position signal for monitoring or coordinated axis functions.
Frequently Asked Questions about KDA 2.1-100-3-LYI-U1:
Q: What type of cooling does the KDA 2.1-100-3-LYI-U1 spindle drive utilize?
A: The cooling system uses a mounted heatsink blower for effective thermal management in the KDA 2.1-100-3-LYI-U1.
Q: What is the rated current for the KDA 2.1-100-3-LYI-U1 spindle drive?
A: The KDA 2.1-100-3-LYI-U1 operates with a rated current of 100 A.
Q: What DC supply voltage is required by the KDA 2.1-100-3-LYI-U1?
A: This drive accepts a DC supply voltage of 300 VDC.
Q: How is the speed command value provided to the KDA 2.1-100-3-LYI-U1 spindle drive?
A: The speed command value is communicated via the SERCOS Interface on this model.
Q: What is the maximum installation elevation for the KDA 2.1-100-3-LYI-U1 spindle drive?
A: This drive can be installed at elevations up to 1000 meters above sea level.
