KDA 2.1-150-3-LP0-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-150-3-LP0-W1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 150 Amps and operates with a DC supply voltage of 300 VDC. The drive uses forced cooling with a mounted heatsink blower and supports ambient temperatures from 5 to 45 degrees Celsius.
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Product Description:
Bosch Rexroth Indramat produces the KDA 2.1-150-3-LP0-W1, a spindle drive in the KDA Spindle Drives series. The 2.1 designation indicates the second generation and revision 1 within this product line. Designed for rack mounting beside supply modules and CNC controllers, the unit conditions DC-bus energy and delivers three-phase output for high-speed machining spindles. It is used in machine tools where the spindle must accelerate quickly, hold commanded speed through changing loads, and decelerate in a controlled manner. By combining current control with encoder feedback, it maintains commanded surface speeds during drilling, milling, and similar automated cutting operations.
Its continuous output capability is anchored by a rated current of 150 A, allowing the drive to energize large spindle motors under sustained load. The internal power stage is supplied from a DC bus of 300 VDC, and the mounted heatsink blower operates on 220 V, 50–60 Hz single-phase power. This airflow system provides forced cooling across the IGBT stack to control internal temperature during operation. Stable thermal behavior helps the control section preserve speed regulation when the spindle is exposed to long machining cycles or repeated acceleration. The drive is intended for ambient temperatures from 5 to 45 °C, so it should be used in a conditioned enclosure if surrounding air rises above that range.
The unit can be installed at elevations up to 1000 m above sea level without duty adjustment. A configurable second encoder input accepts spindle position feedback or auxiliary motor feedback for synchronized motion functions on multi-axis machine tools. This extra feedback channel can support spindle orientation or coordination with related axes when the machine design requires it. Speed reference data are transferred through the real-time SERCOS interface, which reduces susceptibility to analog noise during communication with the CNC controller. The drive has no additional interface option, so it is intended for applications that use the standard communication arrangement only.
