KDA 3.1-150-3-AYS-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-150-3-AYS-U1 is a spindle drive in the KDA Spindle Drives series, featuring a rated current of 150 Amps and powered by a 300 VDC supply voltage. It has forced cooling with a mounted heatsink blower that uses a 115V AC source and operates within an ambient temperature range of 5 to 45 degrees Celsius. The unit includes a serial interface (RS 232 C) and supports a second encoder input and synchronous input.
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Product Description:
The KDA 3.1-150-3-AYS-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts regulated DC power into three-phase output for high-speed machining spindles and coordinates speed with the machine controller. It is suited for applications where the spindle must respond quickly to commanded speed changes and maintain stable rotation during cutting, drilling, or milling cycles. The unit is intended for operation inside closed automation cabinets, where its heatsink fan removes heat from the power section and supports stable internal temperatures during continuous use.
This model is energized by a DC link of 300 VDC, and its power electronics can deliver a continuous drive current of 150 A to the attached motor. That current capacity supports sustained spindle loading during long machining passes without relying on short-term overload operation. The integral heatsink blower draws its auxiliary supply from 115 V 50-60 Hz, so no separate low-voltage fan source is required. Thermal management uses forced cooling, which moves air directly across the power-stage fins and adjacent heat-producing components. Safe operation is maintained when the surrounding air remains within 5 to 45 °C during normal cabinet installation.
The installation altitude may reach 1000 m above sea level without adjustment to the current limits. A dedicated connector accepts a second encoder input for spindle orientation or synchronous channel feedback, while the available RS-232-C serial port provides access for setup and diagnostic communication. Speed reference signals are processed as an analog command, which supports straightforward interfacing with legacy CNC controllers that do not use digital speed commands. These interfaces allow the control system to monitor spindle position, exchange service data, and support orientation functions such as alignment during machine operating sequences. The type code indicates Series 3, and the drive is intended for use with matching supply and control hardware from the same platform.
Frequently Asked Questions about KDA 3.1-150-3-AYS-U1:
Q: What cooling method does the KDA 3.1-150-3-AYS-U1 spindle drive use?
A: The KDA 3.1-150-3-AYS-U1 uses a mounted heatsink blower for cooling, ensuring efficient thermal management during operation.
Q: What is the rated current of the KDA 3.1-150-3-AYS-U1?
A: This spindle drive offers a rated current of 150 A for demanding spindle applications.
Q: What AC source is needed for the heatsink blower on the KDA 3.1-150-3-AYS-U1?
A: The AC source required for the heatsink blower on this unit is 115V at 50-60Hz.
Q: What type of additional interface does the KDA 3.1-150-3-AYS-U1 provide?
A: The KDA 3.1-150-3-AYS-U1 features a serial (RS 232 C) interface for communication and integration.
Q: What is the maximum installation elevation for the KDA 3.1-150-3-AYS-U1?
A: The KDA 3.1-150-3-AYS-U1 is designed to operate at altitudes up to 1000 meters above sea level.
