Product Description:

Bosch Rexroth Indramat’s KDA 3.2-050-3-APS-U1 is a spindle drive in the KDA Spindle Drives series. It converts DC bus energy into controlled three-phase output for high-speed spindle motors used in machining centers, grinders, and automated production cells. By combining current regulation with rapid speed feedback, the unit allows the automation controller to impose precise rotational profiles during cutting, drilling, or finishing operations. The drive carries the internal designation Series 3, Version 2, which identifies its revision within this product line. This arrangement makes the unit suitable for applications that require stable spindle speed, responsive acceleration, and consistent control during changing load conditions.

Electrical capability starts with a rated output of 50 A, enabling medium-frame spindle motors to accelerate without saturation. Its internal DC bus is maintained at 300 VDC, giving a constant voltage reference for the inverter stage and supporting common-bus installations. Thermal stability is handled by forced cooling through a mounted heatsink blower, and the blower itself is powered from an independent 115 V/50–60 Hz supply so cabinet voltage drops do not impair airflow. The unit operates over an ambient range of 5 to 45 °C, which suits typical shop-floor conditions. Separating the blower supply from the main power section helps maintain airflow during varying machine loads and supports steady thermal behavior inside the cabinet.

Installation allowances extend to a maximum altitude of 1000 m before derating is required, letting the drive serve facilities positioned on moderate plateaus. Communication with supervisory equipment is provided by an integrated serial port using the RS-232-C standard, which supports parameter transfer and diagnostics without fieldbus hardware. For velocity reference, the power stage accepts an analog command, aligning with legacy CNC controllers that still use ±10 V speed loops. A dedicated second encoder input permits spindle feedback or additional motor feedback, giving the motion system an option for dual-channel position verification. This interface set supports both established control architectures and installations that need more than one source of rotational feedback.