Product Description:

The KDA 2.1-100-3-DYD-W1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It regulates torque and speed in machine-tool spindles by converting a fixed DC link into a controlled three-phase output, enabling precise positioning in CNC machining centers. By providing commanded current profiles for acceleration, cutting, and deceleration, the unit acts as a dedicated axis amplifier within automated production lines and supports stable spindle response during changing load conditions.

Internally, the power stage is energized from a DC bus rated at 300 VDC, allowing the converter to deliver up to 100 A of continuous armature current to the spindle motor. Thermal management relies on a mounted heatsink blower that pushes air across the output devices; this assembly operates in forced cooling mode from an auxiliary supply of 220 V/50-60 Hz. Isolating the blower circuit from the main bus keeps airflow constant during low-speed or standby operation and helps prevent semiconductor overtemperature trips. This arrangement helps maintain consistent thermal conditions when spindle speed drops or the motor is stopped.

Command and feedback exchange is handled through a digital (16-bit parallel) speed channel, while finer positioning tasks use the digital position command value interface. For axes that require tight synchronism, the drive offers a second encoder input and synchronous input, so the controller can evaluate motor feedback and an external master signal at the same time during coordinated motion. Safe deployment is limited to installations up to 1000 m above sea level; within this altitude range, the heatsink blower and power devices remain within their temperature rise limits when the ambient temperature stays between 5 °C and 45 °C. The stated altitude and ambient conditions must be observed during operation.