Product Description:

The KDA 2.1-150-3-A00-U1-115 is a spindle drive manufactured by Bosch Rexroth Indramat and positioned in the KDA Spindle Drives series for high-power motorized spindle control. Designed as Series 2 hardware, it converts a fixed DC bus into three-phase output to regulate speed and torque on machining centers and grinding heads. By integrating power electronics with dedicated cooling hardware, the unit supplies programmable torque while staying within thermal limits required for continuous industrial automation duty. The design is intended for machine tools where spindle speed must remain stable during drilling, milling, and grinding under changing loads.

This drive delivers a rated output current of 150 A, allowing it to energize large spindle motors without derating during heavy material removal. The internal bus accepts 300 VDC from the supply module, and the resulting heat is removed by a heat sink-mounted blower. That blower is paired with a forced cooling airflow path, ensuring semiconductor junctions remain below design temperature even at peak current. The blower itself is powered by an auxiliary tap of 115 V 50/60 Hz, so cabinet builders only need a standard low-voltage AC branch to run the fan assembly. Speed commands arrive as an analog reference, and the controller converts that analog voltage into a torque-producing current loop for the spindle motor.

The drive can operate at ambient temperatures from 5 to 45 °C, and installation altitude may reach 1000 m before additional derating is required. The unit has no additional interface option installed, so the standard control configuration is retained. It also lacks a second encoder input, so only the primary resolver or encoder channel is processed for speed feedback. This keeps the feedback path limited to the main channel used for speed regulation.