KDA 3.1-100-3-DYD-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-DYD-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 VDC. It features forced cooling through a mounted heatsink blower powered by a 115V, 50-60Hz AC source, and supports a second encoder input as well as digital speed and position command values. The drive operates within an ambient temperature range of 5 to 45 degrees Celsius and is designed for installation at elevations up to 1000 meters above sea level.
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Product Description:
The KDA 3.1-100-3-DYD-U1 is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Serving as a drive module for machine-tool spindles, it converts a common DC bus into regulated three-phase output while exchanging digital commands with the CNC to control speed and orientation during milling, drilling, or grinding, so commanded spindle speed follows the machining program during rapid changes in load. It is intended for multi-axis cabinets where spindle and feed drives operate together from shared power infrastructure. This arrangement supports compact machine layouts and coordinated motion on machining centers.
The drive links to a bus voltage of 300 VDC, which it switches through IGBT stages to energize the spindle windings. A continuous output rating of 100 A supports high-torque acceleration without derating under nominal conditions. Heat is removed by forced cooling, and a finned heat sink with a blower moves air across the power electronics to keep internal temperatures within range. That blower is supplied from an auxiliary line of 115 V, 50–60 Hz, separating its service power from the DC link. Velocity setpoints arrive through a digital 16-bit parallel speed command, giving fine resolution for closed-loop spindle control during precision machining. This cooling method supports sustained spindle duty in enclosed control cabinets where heat from neighboring axes is also present.
The module operates in ambient temperatures of 5–45 °C without additional climate control in typical indoor installations. Installations up to 1000 m elevation do not require current reduction, which allows the same drive setup to be used in most production facilities. For position-controlled spindle tasks, it provides a digital position command interface and a second encoder input for synchronized feedback from the motor shaft. The extra feedback channel can be used when the application needs direct correlation between commanded spindle position and measured shaft movement. This arrangement supports accurate spindle orientation for indexed operations, tool change positioning, and other motions that require repeatable angular control.
Frequently Asked Questions about KDA 3.1-100-3-DYD-U1:
Q: What DC supply voltage is required for the KDA 3.1-100-3-DYD-U1 spindle drive?
A: The KDA 3.1-100-3-DYD-U1 operates with a DC supply voltage of 300 VDC.
Q: What is the rated current of the KDA 3.1-100-3-DYD-U1 spindle drive?
A: This spindle drive has a rated current of 100 A, allowing it to support robust operational loads.
Q: How is the KDA 3.1-100-3-DYD-U1 spindle drive cooled?
A: Cooling is achieved through a mounted heatsink blower using forced cooling.
Q: What type of speed command value input does the KDA 3.1-100-3-DYD-U1 support?
A: The KDA 3.1-100-3-DYD-U1 supports digital speed command values with 16-bit parallel input.
Q: What is the maximum installation elevation for the KDA 3.1-100-3-DYD-U1 spindle drive?
A: This model may be installed at elevations up to 1000 meters above sea level.
