KDA 2.1-100-3-A0I-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-100-3-A0I-W1 is a spindle drive in the KDA Spindle Drives series. It offers a rated current of 100 Amps and uses 300 VDC supply voltage. The drive features forced cooling with a mounted heatsink blower and supports an ambient temperature range from 5 to 45 degrees Celsius.
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Product Description:
The KDA 2.1-100-3-A0I-W1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It functions as a closed-loop current and velocity regulator for high-speed machine tool spindles, converting DC link energy from a common supply into controlled three-phase output for an induction or synchronous motor. In automated machining centers, the unit maintains commanded rotational speed and supplies feedback signals to the numerical control for precise cut quality. This closed-loop operation helps the spindle respond quickly to changing cutting loads during operation.
The drive draws a continuous line current of 100 A from the DC bus and is powered by a link voltage of 300 VDC, which guides fuse sizing and busbar selection in multi-axis cabinets. Its integral blower is fed from an auxiliary 220 V/50-60 Hz AC source, isolating the cooling load from the DC power path and keeping semiconductor junction temperature within an acceptable range. The cooling assembly uses a heatsink-mounted blower, moving air directly across the fin stack so thermal resistance stays low. The unit uses forced cooling, so airflow is provided by the drive itself rather than by enclosure convection, permitting full current delivery even at low spindle speeds where internal losses are highest.
The drive operates in ambient air from 5 to 45 °C, preventing condensation at startup while allowing cabinet temperatures common to shop floors. Installation is permitted up to 1000 m above sea level without current derating, matching most factory elevations. For position correlation, the controller offers an incremental encoder output that reproduces spindle angle for external PLCs. Speed demand is accepted as an analog voltage input, which simplifies connection to legacy CNC cards. The hardware does not provide a second encoder input, and the unit is part of series 2 with the footprint and connector placement used in Indramat KDA racks.
Frequently Asked Questions about KDA 2.1-100-3-A0I-W1:
Q: What is the rated current supported by the KDA 2.1-100-3-A0I-W1 spindle drive?
A: The KDA 2.1-100-3-A0I-W1 supports a rated current of 100 A for spindle operation.
Q: How is the KDA 2.1-100-3-A0I-W1 spindle drive cooled?
A: This spindle drive uses a mounted heatsink blower with forced cooling to maintain safe operating temperatures.
Q: What AC voltage and frequency does the heatsink blower of the KDA 2.1-100-3-A0I-W1 require?
A: The required AC source for the heatsink blower is 220V at 50-60Hz.
Q: What additional interface is included with the KDA 2.1-100-3-A0I-W1 spindle drive?
A: The KDA 2.1-100-3-A0I-W1 provides an incremental encoder output as an additional interface.
Q: What is the maximum installation elevation for the KDA 2.1-100-3-A0I-W1?
A: This model can be installed up to 1000 meters above sea level.
