Product Description:

The KDA 3.2-100-3-D0D-U1 is a drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It serves as the power and control stage between the DC bus and a high-speed spindle motor, converting the link voltage into a regulated three-phase output. Digital speed and position references arrive from a CNC controller, allowing the unit to synchronize spindle motion with tool paths and maintain tight velocity tolerances required in machining centers, grinders, and drilling systems. This control arrangement supports stable spindle behavior during cutting operations that depend on synchronized rotation and feed movement.

This model supplies a continuous output of 100 A, giving it the current capacity to start and accelerate large-diameter spindles without stall. The power section operates from a link voltage of 300 VDC, which is typically provided by a common supply module shared with other axes on the machine. Thermal energy is removed by an integral blower powered from a separate 115 V/50-60 Hz source, so the control electronics stay isolated from line disturbances. Because the cooling method is forced cooling, airflow is actively driven across the heat sink fins instead of relying on natural convection. Speed references are delivered as a digital 16-bit parallel word, enabling fine resolution over the full speed range, while an additional digital interface carries position commands for threading or rigid tapping sequences. This arrangement supports accurate speed changes without relying on analog reference signals.

The drive can operate at ambient temperatures from 5–45 °C, which suits typical shop-floor enclosures without supplementary chillers. Installation is permitted up to 1000 m above sea level before derating is required. Cooling is provided by a mounted heatsink blower, so no external ducting is required inside the cabinet. For coordinated interpolation, a dedicated position command value channel allows the drive to accept discrete position words in addition to its primary speed loop. That input helps the controller coordinate spindle-related functions with axis movement during machining cycles.