KDA 3.1-150-3-A0D-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-150-3-A0D-U1 is a spindle drive from the KDA Spindle Drives series with a rated current of 150 Amps and a DC supply voltage of 300 VDC. It features forced cooling via a mounted heatsink blower powered at 115V, 50-60Hz, and operates in ambient temperatures from 5 to 45 degrees Celsius. The drive supports digital position command values and analog speed command values, and is designed for installation up to 1000 meters above sea level.
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Product Description:
The KDA 3.1-150-3-A0D-U1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. In automated machining centers, this unit operates as a dedicated spindle drive, converting DC-bus energy into controlled three-phase output that follows commanded speed and torque profiles. It is built for Series 3 layouts and supports the sustained electrical loading commonly seen in metal-cutting applications. An onboard heatsink blower removes switching losses during continuous duty, helping the drive remain stable during drilling, milling, and other high-speed spindle work. The drive is intended for applications where rapid speed changes and controlled torque are needed to keep tool performance consistent across varying material loads.
The power stage is rated for a continuous output of 150 A, which allows it to drive large spindle motors without reaching current limits too quickly under load. It draws its intermediate circuit from a 300 VDC supply shared with compatible Indramat supply modules. Thermal management relies on a mounted heatsink blower that receives utility power at 115 V, 50/60 Hz and moves air directly across the finned aluminum heat sink. This arrangement is classified as forced cooling. Because the blower uses a separate utility supply, cooling can be maintained without depending on the spindle output stage. The airflow helps control internal temperature during extended machining cycles in which the spindle remains under heavy demand.
Speed control is commanded by an analog reference, and position loops can also use a digital position command value input. The unit does not include a secondary encoder connection, so there is no additional feedback input for redundant sensing. Reliable operation is specified between 5 to 45 °C and at mounting locations up to 1000 m above sea level. Operation outside these limits requires derating. This combination allows the drive to work in systems that use conventional analog speed commands while still accepting higher-level digital positioning input. The operating range is suitable for enclosed electrical cabinets used on standard shop-floor machinery.
Frequently Asked Questions about KDA 3.1-150-3-A0D-U1:
Q: What is the power specification for the heatsink blower in the KDA 3.1-150-3-A0D-U1 spindle drive?
A: The KDA 3.1-150-3-A0D-U1 is equipped with a heatsink blower that operates on 115V at 50-60Hz.
Q: What is the rated current capacity of the KDA 3.1-150-3-A0D-U1 spindle drive?
A: This spindle drive supports a rated current of 150 A.
Q: How is the KDA 3.1-150-3-A0D-U1 spindle drive cooled during operation?
A: The cooling mode for this model is forced cooling provided by a mounted heatsink blower.
Q: What is the maximum installation elevation specified for the KDA 3.1-150-3-A0D-U1?
A: The maximum allowed installation elevation for the KDA 3.1-150-3-A0D-U1 is 1000 meters above sea level.
Q: What type of speed command input does the KDA 3.1-150-3-A0D-U1 spindle drive support?
A: This unit accepts an analogue speed command value for controlling spindle speed.
