KDA 3.1-150-3-A0I-U1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Bosch Rexroth Indramat KDA 3.1-150-3-A0I-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 Volts. It features forced cooling using a mounted heatsink blower powered by a 115V AC source and supports an ambient temperature range from 5 to 45 degrees Celsius. This model also provides an incremental encoder output and uses an analogue speed command value.
Internal Product Review
The KDA 3.1-150-3-A0I-U1 spindle drive from Bosch Rexroth Indramat features a forced cooling system with a mounted heatsink blower powered by a 115V/50-60Hz AC source. With a 150 A rated current and 300 VDC supply voltage, this unit reliably supports demanding spindle applications. Incremental encoder output and analog speed command value make it a versatile choice for precise control needs.
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Product Description:
The KDA 3.1-150-3-A0I-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. This unit converts a common DC link into a controlled three-phase output for machine-tool spindles, allowing precise velocity and torque regulation in CNC machining centers, grinding systems, and automated production cells. By combining power conversion with closed-loop feedback, it maintains commanded speed during rapid load changes and supports consistent surface finish and tool life in industrial automation.
The power section is energized by 300 VDC from the shared supply, which provides the intermediate-circuit energy available to the inverter. From that bus, the drive can furnish up to 150 A of continuous phase current, giving large spindle motors the current needed for high-acceleration cutting cycles. Losses generated by the switching devices are removed by a mounted heat sink blower. Because airflow is actively forced, the cooling method is classified as forced cooling and keeps internal junction temperatures within design limits during sustained duty. The blower itself runs from a dedicated 115 V/50–60 Hz source, allowing ventilation to stay active during coast-down or maintenance when the DC link is de-energized.
On the control side, the unit offers an incremental encoder output so spindle position feedback can be wired directly to the numerical control. The speed reference is taken as an analog ±10 V signal, simplifying integration with standard motion cards. The unit can operate between 5 to 45 °C; outside this range, additional enclosure conditioning is required to avoid thermal derating. Installation altitude is limited to 1000 m above sea level, which helps maintain adequate air density for cooling and reliable insulation distances. A secondary encoder input is not provided, so applications that need dual feedback must implement that function at the control level.
