KDA 2.1-050-3-AYI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-AYI-U1 spindle drive is part of the KDA Spindle Drives series. It features a rated current of 50 Amps and operates with a DC supply voltage of 300 VDC, using forced cooling through a mounted heatsink blower. The drive accepts analog speed command values and includes both incremental encoder output and a second encoder input with synchronous input.
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Product Description:
The KDA 2.1-050-3-AYI-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a spindle drive, it converts DC-bus energy in a multi-axis system into controlled three-phase power for high-speed motor spindles used in CNC machining centers and other automated cutting equipment. This arrangement supports spindle operation during drilling, milling, and similar machining processes where stable speed response and coordinated axis behavior are required. The unit is part of Series 2 hardware, and its control channels accept an analog speed command so the controller can regulate spindle speed with proportional accuracy.
Internally, the power stage is fed from a 300 VDC link and can deliver a continuous output of 50 A to the spindle motor at full load. Thermal management is handled by a mounted heat sink blower that pushes air across the fin assembly, and the blower is powered from an auxiliary 115 V/50-60 Hz source so cooling can remain active when the main DC bus is de-energized. The control board expects an analog speed reference, allowing the host controller to vary spindle speed with a ±10 V signal rather than a fixed-step command. In addition to the primary encoder port, the drive includes a second encoder input and a synchronous input for motor feedback and spindle orientation functions without external splitter hardware. This layout supports applications that need speed regulation together with position-related spindle functions such as alignment before tool changes.
The unit uses forced cooling, so airflow from the attached blower must remain unobstructed during operation. Its permitted ambient operating temperature is 5 to 45 °C, and performance data are valid for installations up to 1000 m above sea level. For drive-based monitoring, an incremental encoder output is routed to the terminal strip so downstream control devices can read real-time spindle speed directly. This signal path can support status display, supervision, or synchronized control functions that depend on current spindle feedback.
Frequently Asked Questions about KDA 2.1-050-3-AYI-U1:
Q: What is the rated current capability of the KDA 2.1-050-3-AYI-U1 spindle drive?
A: This model supports a rated current of 50 A, making it suitable for demanding spindle applications.
Q: What type of cooling system does the KDA 2.1-050-3-AYI-U1 utilize?
A: The KDA 2.1-050-3-AYI-U1 uses a mounted heatsink blower designed for forced cooling.
Q: What is the required DC supply voltage for the KDA 2.1-050-3-AYI-U1?
A: A DC supply voltage of 300 VDC is required for the operation of this spindle drive.
Q: What is the operating ambient temperature range for the KDA 2.1-050-3-AYI-U1?
A: The supported ambient temperature for this drive ranges from 5 to 45 degrees Celsius.
Q: To what maximum elevation can the KDA 2.1-050-3-AYI-U1 be installed?
A: The maximum installation elevation for this model is 1000 meters above sea level.
