Product Description:

The KDA 3.2-100-3-LP0-U1 is a drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It is intended to regulate high-speed machine-tool spindles by converting a constant DC bus into controlled three-phase output that tracks speed commands from a motion controller. By delivering closed-loop torque and velocity control, the unit positions or accelerates the spindle in turning, milling, and grinding centers where coordinated motion is required for tool engagement, speed changes, and repeatable machining cycles.

The power section is energized from a DC link of 300 VDC, and its laminated bus bars can carry a continuous phase current of 100 A. Heat generated by the IGBT bridge is removed through forced cooling that moves air across a fin stack with a mounted heat sink blower; the blower motor is supplied by an auxiliary line of 115 V/50–60 Hz. This cooling arrangement maintains semiconductor temperatures while keeping cabinet doors closed during normal operation. The ambient operating envelope spans 5 to 45 °C, allowing installation on shop floors that are neither refrigerated nor heated beyond normal comfort limits. Because the internal logic runs from a stable DC bus, voltage transients on the three-phase mains are isolated from the spindle motor.

Velocity references reach the control board via the SERCOS interface, and a second encoder input can be assigned either to spindle feedback or to an auxiliary motor, enabling synchronized axis operation. Harnessing is simplified because the unit is shipped with no additional interfaces, so only the fieldbus fiber, the encoder pair, and the power leads must be routed through the cabinet. Installation is permitted up to 1000 m above sea level without output derating, provided the forced-air path remains unobstructed and the ambient temperature stays within the allowed range.