KDA 3.1-150-3-D0S-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-150-3-D0S-U1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 150 Amps and operates with a DC supply voltage of 300 VDC. Forced cooling is achieved by a mounted heatsink blower powered by a 115V AC source, and it supports a digital 16 bit parallel speed command value.
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Product Description:
The KDA 3.1-150-3-D0S-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. Designed for CNC and automated machining centers, this spindle drive converts common DC-bus power from the cabinet supply into controlled three-phase output for high-speed motor operation. Within an automation cell, it closes the speed control loop so the control system can command acceleration, deceleration, and constant surface speed on the workpiece spindle. This allows the spindle to follow programmed speed changes during drilling, milling, and turning operations. The drive’s integrated heat sink blower and dedicated logic interfaces support continuous duty in production environments.
It draws its power from a regulated DC link of 300 VDC and can deliver a continuous motor phase current of 150 A. The heat sink blower is powered separately by an auxiliary supply of 115 V/50-60 Hz, so the thermal management circuit can remain active even when the main DC bus is off. Airflow is provided by a mounted heat sink blower that pushes air directly across the power modules and keeps semiconductor junction temperatures within limits. A RS-232C serial interface is available for parameter upload, diagnostics, and service access, while a second encoder port is omitted to simplify spindle-axis wiring.
The unit can operate from 5 to 45 °C and at elevations up to 1000 m above sea level without derating. Cooling air moves through the unit by forced cooling and depends on unobstructed cabinet ventilation paths. Proper ventilation is required so heated air can leave the cabinet without recirculating through the drive. Speed commands arrive from the host controller as a 16-bit parallel digital word, giving the numerical resolution needed for precise RPM control during tapping, contour milling, or grinding. Series revision 3 circuitry supervises current, voltage, and thermal sensors during operation.
Frequently Asked Questions about KDA 3.1-150-3-D0S-U1:
Q: What is the required DC supply voltage for the KDA 3.1-150-3-D0S-U1 spindle drive?
A: The KDA 3.1-150-3-D0S-U1 operates with a DC supply voltage of 300 VDC.
Q: How is the KDA 3.1-150-3-D0S-U1 spindle drive cooled?
A: This unit features a mounted heatsink blower and uses forced cooling for thermal management.
Q: What is the maximum installation elevation for the KDA 3.1-150-3-D0S-U1?
A: The KDA 3.1-150-3-D0S-U1 can be installed at elevations up to 1000 meters above sea level.
Q: What is the rated current of the KDA 3.1-150-3-D0S-U1 spindle drive?
A: The rated current for this spindle drive is 150 A.
Q: What additional interface is included on the KDA 3.1-150-3-D0S-U1 model?
A: The KDA 3.1-150-3-D0S-U1 provides a serial interface (RS 232 C) as an additional interface option.
