Product Description:

The KDA 3.1-100-3-LQD-W1 is a drive module manufactured by Bosch Rexroth Indramat and placed in the KDA Spindle Drives series. Serving as the axis power stage in machining centers and other automated tooling, it translates designated speed and position data from a supervising controller into regulated motor currents. By housing both the power electronics and an integral heatsink blower, the unit supports compact installation in electrical cabinets while maintaining the fast torque response required for spindle acceleration and deceleration.

Internally, the converter is supplied from a DC bus of 300 VDC, and this link voltage can be shared with other drives on the HVR power supply so simultaneous deceleration can return energy to the system. The power stage can deliver a continuous phase current of 100 A, allowing the connected spindle motor to handle high cutting loads without derating. Speed references arrive over a SERCOS interface, while a separate channel accepts a digital position command value for precise orientation moves such as tool-change positioning. Thermal management relies on a heatsink blower fed by an auxiliary line of 220 V / 50–60 Hz, preventing the IGBT modules from exceeding their junction limits during prolonged high-duty operation.

Because the cooling hardware is a mounted heatsink blower, the drive must be installed so that exhaust air is not obstructed. This arrangement provides forced cooling, which helps keep the heatsink surface below its design temperature during operation. Reliable operation is specified for ambient conditions from 5–45 °C, and performance figures remain valid at sites up to 1000 m above sea level. Within the series, this model is version 3 and uses the later connector arrangement associated with the digital command channels in the KDA range.