Product Description:

The KDA 2.1-100-3-DY0-W1 is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. The unit functions as a closed-loop controller that modulates the current and voltage delivered to a spindle motor, allowing precise speed and torque regulation in CNC machining and other automated cutting processes. By converting a fixed DC bus into a variable three-phase output, the drive links higher-level numerical controls with the spindle so coordinated acceleration, deceleration, and positioning sequences can be carried out during high-speed manufacturing operations.

The drive draws its DC link energy from a 300 VDC supply and can deliver a continuous armature current of 100 A, which is the maximum current available for sustained spindle load. Thermal energy generated at this current is removed through a heat sink with an AC blower supplied by 220 V/50–60 Hz, and the assembly relies on forced cooling to keep the power section within its intended operating temperature range. Speed references are accepted as 16-bit parallel digital words, allowing a numerical control to send 65,536 discrete velocity points without analog conversion. Because the design includes no additional interface option, field wiring is limited to power, command, and feedback conductors.

The drive operates in ambient temperatures from 5 to 45 °C, so cabinet conditioning is only needed when local temperatures move beyond that range. Installation altitude is limited to 1000 m above sea level so the mounted heatsink blower can maintain adequate airflow through the cooling path. For applications that require real-time position verification, a second encoder input and a matching synchronous trigger are provided, allowing simultaneous monitoring of the spindle and workpiece axes. If the installation exceeds the stated ambient limits, additional enclosure cooling may be needed to maintain stable spindle performance.