KDA 3.1-100-3-L0D-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-100-3-L0D-U1 is a spindle drive from the KDA Spindle Drives series. It features forced cooling through a mounted heatsink blower and operates with a rated current of 100 Amps at a DC supply voltage of 300 VDC. The drive supports position command and speed command via digital and SERCOS interface, and can be installed up to 1000 meters above sea level within an ambient temperature range of 5 to 45 degrees Celsius.
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Product Description:
The KDA 3.1-100-3-L0D-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. In a machining center or turning cell, it regulates spindle speed and torque so cutting tools maintain commanded surface speed and finish quality during drilling, milling, and turning operations. By converting common DC bus voltage from the cabinet supply into three-phase output for the motor, the unit serves as the electrical link between the central power supply and the high-speed spindle in an automated production line. Stable spindle regulation also helps maintain chip load and reduce variation in surface finish as cutting conditions change throughout the cycle.
The drive operates from a DC bus of 300 VDC, and its power stage is sized for a continuous output of 100 A, allowing large-frame spindle motors to reach high acceleration without derating. Thermal management relies on a heat sink-mounted blower, and that blower is energized by an auxiliary source of 115 V, 50–60 Hz rather than by the DC link itself. The unit uses forced cooling, so air is moved across the fins to keep semiconductor temperatures within safe limits during sustained spindle demand. The electronics are designed to function in ambient temperatures from 5 to 45 °C, which suits enclosed industrial cabinets with controlled airflow.
For installation heights up to 1000 m above sea level, the power semiconductors can still deliver rated current without altitude derating in standard shop conditions. Velocity commands arrive through the SERCOS interface, providing a fiber-optic communication path for coordinated spindle control. An additional channel accepts a digital position command value so numerical controls can close positional loops directly through the drive when the application requires indexed spindle motion. This supports applications that need both continuous speed regulation and position-based spindle functions such as orientation or rigid tapping. No second encoder socket is provided, which keeps the wiring straightforward when a single spindle encoder is used.
Frequently Asked Questions about KDA 3.1-100-3-L0D-U1:
Q: How is the KDA 3.1-100-3-L0D-U1 spindle drive cooled?
A: This model features a mounted heatsink blower for forced air cooling.
Q: What is the rated current output of the KDA 3.1-100-3-L0D-U1?
A: The rated current for this spindle drive is 100 A.
Q: What is the DC supply voltage required for the KDA 3.1-100-3-L0D-U1?
A: Its DC supply voltage is specified at 300 VDC.
Q: What type of position command interface does the KDA 3.1-100-3-L0D-U1 support?
A: The KDA 3.1-100-3-L0D-U1 supports digital position command value interfaces.
Q: What is the maximum installation elevation for the KDA 3.1-100-3-L0D-U1 spindle drive?
A: The spindle drive can be installed at locations up to 1000 meters above sea level.
