KDA 3.2-050-3-AQS-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.2-050-3-AQS-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 50 Amps and a DC supply voltage of 300 Volts. It features forced cooling via a mounted heatsink blower and operates using a serial RS 232 C interface for communication. This drive is designed for ambient temperatures from 5 to 45 degrees Celsius and supports installation up to 1000 meters above sea level.
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Product Description:
The KDA 3.2-050-3-AQS-U1 drive module is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Built for CNC automation, the unit governs spindle acceleration, constant cutting speed, and dynamic braking by modulating motor frequency and voltage inside machining centers. Its design uses a common DC bus so multiple axes can share regenerated energy during rapid deceleration. It is suited to spindle tasks that require stable speed regulation during tool engagement, speed changes, and braking between machining cycles. That control style is useful in processes where spindle speed must follow programmed changes without abrupt torque disturbances.
Its power stage is fed from a 300 VDC link supplied by the cabinet’s common rectifier, and the inverter can source up to 50 A of continuous current to the attached spindle motor. Thermal stability is maintained by a heat sink blower that operates from a separate 115 V/50–60 Hz single-phase supply. The internal fans work in forced cooling mode so heat is removed even during extended low-speed operation, when motor-mounted airflow may be limited. Parameter access and diagnostic upload are available through a RS-232C serial interface, which provides a direct path for status reporting and parameter exchange. Within the KDA numbering scheme, the unit is part of series 3 and version 2.
For proper operation, the electronics require an ambient temperature between 5 to 45 °C and installation heights not exceeding 1000 m above sea level. The cooling hardware uses a mounted heat sink blower fixed directly to the aluminum body, so airflow follows the fin layout without external ducting. Airflow stays aligned with the fins, which helps move heat away from the power section during continuous duty. Speed reference signals are accepted as an analog voltage, letting the numerical control issue smooth ramps without digital conversion delay. The separate blower arrangement and analog command input support predictable spindle response across changing loads and operating speeds.
Frequently Asked Questions about KDA 3.2-050-3-AQS-U1:
Q: What is the rated current of the KDA 3.2-050-3-AQS-U1 spindle drive?
A: The KDA 3.2-050-3-AQS-U1 operates at a rated current of 50 A.
Q: What type of additional interface does the KDA 3.2-050-3-AQS-U1 feature?
A: This spindle drive uses a serial interface (RS 232 C) for additional connectivity.
Q: What cooling method does the KDA 3.2-050-3-AQS-U1 spindle drive use?
A: The KDA 3.2-050-3-AQS-U1 supports forced cooling with a mounted heatsink blower.
Q: What AC voltage and frequency does the heatsink blower on the KDA 3.2-050-3-AQS-U1 require?
A: The AC power supply for the heatsink blower is 115V and supports 50-60Hz operation.
Q: What is the maximum installation elevation for the KDA 3.2-050-3-AQS-U1?
A: This spindle drive can be installed at elevations up to 1000 meters above sea level.
