KDA 3.1-100-3-AQD-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-AQD-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 100 Amps and a DC supply voltage of 300 Volts. It uses forced cooling with a mounted heatsink blower operating at 115V, 50-60Hz. The device supports analog speed command values and digital position command interfaces, and can be installed up to 1000 meters above sea level.
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Product Description:
The KDA 3.1-100-3-AQD-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It serves as the power stage between a controlled DC bus and a motorized spindle, delivering regulated three-phase output for speed and torque control in automated machining centers. Its card-cage format mounts on a common heat sink rail within multi-axis drive groups, which helps conserve cabinet space and keeps the power section aligned with adjacent modules. This arrangement suits machine layouts where several coordinated drives share the same cabinet structure.
Internally, the drive connects to a shared intermediate circuit rated at 300 VDC, which supplies the voltage reference for the inverter section. It can sustain 100 A of motor current, allowing high-frequency spindles to operate continuously without pushing the power semiconductors beyond normal thermal limits. Cooling is provided by forced cooling, and the fan is powered by an auxiliary supply of 115 V/50-60 Hz so airflow remains available even when the DC link is inactive. The permitted enclosure ambient temperature range is 5 to 45 °C. Because the fan supply is separate from the main power section, thermal support remains available during drive shutdown and restart conditions.
A mounted heat sink blower fixed to the aluminum fin stack exhausts air to the rear and removes switching losses generated during rapid load changes. The unit maintains full rated performance at elevations up to 1000 m above sea level, which suits most factory installations without altitude derating. Control wiring includes a digital position command value input and an analog speed command value channel, allowing a CNC or supervisory controller to request spindle orientation separately from commanded rotational speed. Separate command paths are useful when a machine alternates between speed-regulated cutting and precise angular positioning.
Frequently Asked Questions about KDA 3.1-100-3-AQD-U1:
Q: What is the DC supply voltage required for the KDA 3.1-100-3-AQD-U1 spindle drive?
A: The KDA 3.1-100-3-AQD-U1 operates with a DC supply voltage of 300 VDC.
Q: What is the rated current of the KDA 3.1-100-3-AQD-U1 spindle drive?
A: This drive supports a maximum rated current of 100 A for spindle motor applications.
Q: How is the KDA 3.1-100-3-AQD-U1 spindle drive cooled during operation?
A: The KDA 3.1-100-3-AQD-U1 uses a mounted heatsink blower for forced cooling.
Q: What is the maximum installation elevation for the KDA 3.1-100-3-AQD-U1?
A: This drive can be installed at a maximum elevation of 1000 meters above sea level.
Q: What type of interface does the KDA 3.1-100-3-AQD-U1 offer for position command value input?
A: The position command value interface on this model is digital.
