KDA 3.1-100-3-AQI-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-AQI-U1 is a spindle drive from the KDA Spindle Drives series, featuring a rated current of 100 Amps and a DC supply voltage of 300 VDC. The drive uses forced cooling with a mounted heatsink blower supplied by 115V at 50-60 Hz and supports an ambient temperature range from 5 to 45 degrees Celsius. It includes an incremental encoder output interface and is designed for installation up to 1000 meters above sea level.
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Product Description:
Bosch Rexroth Indramat builds the KDA 3.1-100-3-AQI-U1 within its KDA Spindle Drives series. The unit is intended to regulate the torque and speed of servo-spindles in machining centers, supplying controlled three-phase power while monitoring feedback from the motor. By converting a fixed DC link into variable AC, it lets a CNC controller execute rapid cutting, drilling, or grinding cycles with repeatable accuracy in industrial automation cells. The drive is commonly used on main and auxiliary spindles where fast response is needed during tool engagement, speed changes, and controlled deceleration. That control behavior supports roughing passes that demand quick torque response and finishing operations that require stable speed.
The drive receives blower power at 115 V/50-60 Hz, so a separate low-voltage feed is not required for fan operation. A heat sink-mounted blower pulls air directly across the internal heat sink, and forced cooling helps keep IGBT junction temperatures within safe limits during continuous duty. The power section links to a DC bus rated at 300 VDC, and its current path can deliver a continuous 100 A to the spindle windings. Speed references arrive as an analog voltage, allowing integration with legacy motion controllers that output ±10 V commands rather than serial fieldbus packets. This arrangement lets older CNC systems use a simple command interface while the drive handles spindle power conversion internally. During motion, the incremental encoder signal is routed back through a buffered output so the numerical control sees real-time shaft position.
The electronics operate without derating between 5 to 45 °C, provided cabinet airflow remains unobstructed. Installation altitude can reach 1000 m above sea level before additional cooling or reduced loading becomes necessary. For position tracking, an incremental encoder output is available at the front terminal strip, which simplifies wiring because no external splitter is needed. The front-terminal access also helps keep feedback wiring short inside the cabinet. The control can read spindle position through that path without adding a separate feedback interface module.
Frequently Asked Questions about KDA 3.1-100-3-AQI-U1:
Q: What cooling method is used in the KDA 3.1-100-3-AQI-U1 spindle drive?
A: This model features a mounted heatsink blower and uses forced cooling to maintain efficient operation.
Q: What is the required DC supply voltage for the KDA 3.1-100-3-AQI-U1?
A: The KDA 3.1-100-3-AQI-U1 draws its DC supply voltage from a 300 VDC source.
Q: What is the rated current for the KDA 3.1-100-3-AQI-U1 spindle drive?
A: This spindle drive supports a maximum rated current of 100 A, allowing high load capacity.
Q: What voltage and frequency are needed for the heatsink blower's AC source?
A: The AC source for the heatsink blower must be 115V at 50-60Hz for proper operation.
Q: What type of additional interface does the KDA 3.1-100-3-AQI-U1 offer?
A: An incremental encoder output is provided as an additional interface on this drive.
