KDA 2.1-150-3-A0S-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-150-3-A0S-U1 is a spindle drive from the KDA Spindle Drives series. It provides a rated current of 150 Amps and uses a 300 VDC supply voltage. The drive features a forced cooling system with a mounted heatsink blower and operates in ambient temperatures from 5 to 45 degrees Celsius.
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Product Description:
The KDA 2.1-150-3-A0S-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It regulates three-phase induction or synchronous spindle motors, providing closed-loop speed control for machine-tool spindles and similar high-speed axes used in industrial automation. Acting as a power amplifier between the DC supply and the motor windings, the unit receives an analog speed command from the CNC or motion controller and modulates current to match the requested setpoint. This allows the drive to maintain stable spindle behavior during changing load conditions in machining and other continuous-duty applications.
The drive can deliver a continuous output of 150 A, allowing direct operation of large spindle motors without external boosters. Its intermediate circuit is energized from a regulated bus at 300 VDC, so the connected power supply must provide adequate filtering and ride-through capacity. Thermal management is handled by forced cooling, and a heat sink-mounted blower moves air across the power semiconductors to keep junction temperatures within limits. That blower operates from an auxiliary line rated at 115 V/50–60 Hz, which keeps fan power separate from the DC link. Parameter access and diagnostic data can be exchanged over an RS-232C serial interface, allowing local setup and status monitoring without additional fieldbus hardware.
Proper installation requires ambient conditions between 5 to 45 °C, because operation outside this range can accelerate component aging or trigger protective functions. Operation is specified for sites up to 1000 m above sea level so that reduced air density does not impair heat removal. The speed reference enters the control board as an analog voltage, which supports straightforward integration with legacy CNC units that provide voltage-based commands. Cooling hardware consists of a mounted heat sink blower attached directly to the aluminum fin stack, so airflow follows the intended thermal path without extra ducting. A second encoder input is not provided, so any additional feedback beyond the primary spindle encoder must be managed elsewhere in the control system.
Frequently Asked Questions about KDA 2.1-150-3-A0S-U1:
Q: What is the required AC source for the heatsink blower on the KDA 2.1-150-3-A0S-U1?
A: The KDA 2.1-150-3-A0S-U1 spindle drive uses a 115V/50-60Hz AC source for its heatsink blower.
Q: What type of additional interface is present on the KDA 2.1-150-3-A0S-U1 spindle drive?
A: This spindle drive is equipped with a serial RS 232 C interface for communication.
Q: What is the allowable ambient temperature range for the KDA 2.1-150-3-A0S-U1?
A: The KDA 2.1-150-3-A0S-U1 can operate in ambient temperatures ranging from 5 to 45 degrees Celsius.
Q: How is the KDA 2.1-150-3-A0S-U1 spindle drive cooled?
A: This model uses forced cooling with a mounted heatsink blower for thermal management.
Q: What is the rated current of the KDA 2.1-150-3-A0S-U1 spindle drive?
A: The rated output current of the KDA 2.1-150-3-A0S-U1 is 150 A.
