Product Description:

The KDA 3.2-050-3-DYD-U1 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series, with hardware line 3 and version 2. It converts a fixed DC link into a variable three-phase output for high-speed machine tool spindles while relaying position and speed data to the CNC controller. Installed between the rectifier and the motor, it regulates torque, acceleration, and braking energy during precision machining tasks. The unit is intended for machine tools that require closed-loop spindle control and repeatable response under varying cutting loads.

The power section delivers a continuous output of 50 A from a shared DC bus rated at 300 VDC. Speed reference data enters through a digital 16-bit parallel channel, and a separate digital position command value interface allows the motion controller to apply synchronous position corrections during coordinated spindle movement. Feedback flexibility is increased by a second encoder input and synchronous input, which can read spindle orientation or a tandem measuring system. Using separate command and feedback paths, the drive can maintain accurate spindle synchronization in threading, tapping, and orienting operations. The drive’s logic and power terminals share a common protective earth to reduce common-mode voltage across encoder circuits and support stable signal handling during rapid speed changes.

An integral cooling assembly is supplied from a dedicated line of 115 V / 50–60 Hz, which energizes a blower mounted directly on the rear heatsink. This heatsink-mounted blower pushes air through fin channels in a forced-cooling arrangement that removes heat from the power semiconductors before it spreads through the cabinet. Because the blower is mounted at the rear heatsink, cooling air is directed across the finned surface instead of relying on passive cabinet convection alone. This arrangement supports sustained spindle duty where repeated acceleration and braking place a constant thermal load on the output stage. The drive operates in an ambient range of 5 to 45 degrees Celsius when cabinet airflow matches the blower output.