Product Description:

The KDA 3.2-100-3-LQ0-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a closed-loop power module, it supplies regulated three-phase power to high-speed machine-tool spindles and relays velocity commands from digital motion controllers to the motor field. In automated machining centers, this drive positions and maintains spindle speed so cutting, drilling, or grinding operations stay within tolerance throughout the duty cycle.

The drive’s internal power section is energized from a DC bus held at 300 VDC, so the connected rectifier or power supply must furnish that constant line for energy exchange with other axis modules. Under continuous loading, the inverter can deliver up to 100 A of phase current, a rating that affects the maximum torque the attached spindle motor can generate. Thermal management relies on a heatsink blower powered by an auxiliary supply of 115 V/50–60 Hz; separating this supply prevents fan stalls when the main DC link is disabled during braking. Speed references are transmitted through the standardized SERCOS interface, allowing synchronous control with other axes without analog scaling errors. To maintain component temperatures, the power semiconductors are cooled by forced cooling airflow that pulls ambient air across the fin stack rather than depending on natural convection.

The cooling hardware itself is a mounted heatsink blower, fixed directly to the rear of the housing so the unit can be installed tightly in a control cabinet with no external ducting. Reliable operation is specified for surrounding air from 5 °C to 45 °C, enabling use on factory floors without specialized HVAC. Installation sites may be placed up to 1000 m above sea level before derating is required, a consideration for plants located on elevated terrain. The drive has no additional interface option, so communication and diagnostics remain confined to the drive’s front-panel connectors.