KDA 3.1-100-3-AQS-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-AQS-U1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 100 Amps and operates with a DC supply voltage of 300 VDC. Forced cooling is provided by a mounted heatsink blower, and the unit includes a serial interface (RS 232 C) for communication.
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Product Description:
The KDA 3.1-100-3-AQS-U1 is a spindle drive manufactured by Bosch Rexroth Indramat and supplied within the KDA Spindle Drives series. As a spindle drive, it converts regulated DC link energy from an external supply unit into controlled three-phase power for high-speed machine-tool spindles used in automated machining centers. The unit supports closed-loop speed regulation so the commanded spindle velocity can be reproduced accurately during cutting, drilling, or grinding operations. This control behavior helps the spindle maintain stable rotation when cutting load changes, which supports consistent machining performance during speed-controlled processes.
The drive is rated for a continuous output of 100 A, which is the maximum motor phase current it can deliver without derating. That current capacity is suitable for spindle motors that require sustained torque during continuous machining duty. Internally, it operates from a DC link of 300 VDC; this voltage sets the upper limit for the generated spindle output voltage and affects the available torque at a given speed. Thermal energy generated by the power electronics is removed through a mounted heatsink blower that operates in forced cooling mode, and active airflow keeps device temperatures within safe limits during sustained heavy cuts. That blower uses an auxiliary supply of 115 V/50-60 Hz, separating cooling requirements from the main DC circuit and allowing the heatsink fan to run whenever mains power is present, even when the DC bus is discharged.
The permissible ambient range is 5 to 45 degrees Celsius, supporting stable operation on the factory floor. Installation is permitted up to 1000 m above sea level before additional derating is needed. For integration with supervisory controls, a serial interface (RS-232C) is available for parameter access and diagnostic readouts. Speed commands are accepted as an analog reference, allowing simple voltage or current loop outputs from CNC controllers to set spindle velocity without digital fieldbus hardware.
Frequently Asked Questions about KDA 3.1-100-3-AQS-U1:
Q: What is the rated current for the KDA 3.1-100-3-AQS-U1 spindle drive?
A: The KDA 3.1-100-3-AQS-U1 spindle drive features a rated current of 100 A.
Q: How is the KDA 3.1-100-3-AQS-U1 spindle drive cooled?
A: This model supports forced cooling via a mounted heatsink blower.
Q: What voltage and frequency are needed for the heatsink blower on the KDA 3.1-100-3-AQS-U1?
A: The AC source for the heatsink blower requires 115V at 50-60Hz.
Q: What additional communication interface is provided on the KDA 3.1-100-3-AQS-U1 spindle drive?
A: An RS 232 C serial interface is included as an additional interface on this model.
Q: What is the maximum installation elevation for the KDA 3.1-100-3-AQS-U1 spindle drive?
A: The KDA 3.1-100-3-AQS-U1 can be installed at elevations up to 1000 meters above sea level.
