KDA 2.1-050-3-DQ0-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-DQ0-W1 is a spindle drive from the KDA Spindle Drives series with a rated current of 50 Amps and a DC supply voltage of 300 VDC. It uses a mounted heatsink blower for forced cooling and operates at ambient temperatures ranging from 5 to 45 degrees Celsius. The unit supports digital 16-bit parallel speed command values and is designed for installation up to 1000 meters above sea level.
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Product Description:
The KDA 2.1-050-3-DQ0-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It functions as the power and control stage for high-speed machine-tool spindles, converting command words from the CNC into regulated three-phase output that helps keep cutting speed stable under load. Integrated monitoring of current, voltage, and temperature protects the connected motor and reduces the need for separate external protection hardware in the cabinet.
An internal fan circuit is energized from an auxiliary supply of 220 V at 50/60 Hz. Air is directed across the cooling fins by a mounted heat sink blower that operates with forced cooling to remove switching losses even at low motor speed. The power section is linked to a shared DC bus at 300 VDC, allowing multiple drives to draw from the same rectifier. During continuous operation, the converter can deliver a rated phase current of 50 A, making it suitable for medium-frame spindle motors in sustained machining duty. Velocity reference data arrives as a 16-bit parallel digital word, providing the numerical resolution needed for precise speed control and reduced following error when the control loops operate at high frequency.
The drive is supplied with no additional interface option, so it uses the basic digital command arrangement provided in the standard configuration. Reliable operation is supported across an ambient range of 5 to 45 °C, and installation is permitted at sites up to 1000 m above sea level. These limits support use in enclosed machine cabinets for milling centers, lathes, and grinding machines where stable spindle regulation is required during extended production runs. The unit’s second-generation control design also supports consistent drive behavior during changing spindle loads and rapid speed adjustments.
