KDA 2.1-150-3-A0S-U1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
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.
Internal Product Review
The KDA 2.1-150-3-A0S-U1 spindle drive from Bosch Rexroth Indramat delivers stable performance with forced cooling via a mounted heatsink blower and a 150 A rated current. Featuring a 300 VDC supply voltage and a serial RS 232 C interface, this unit supports reliable high-power spindle control. The combination of efficient cooling and strong electrical capacity makes it a dependable choice for demanding industrial environments.
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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.
