Product Description:

The KDA2.1-150-300-AP0-U1/115 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Acting as a regulated power stage between the machine controller and a high-speed spindle motor, it converts DC bus energy into three-phase output while monitoring rotor feedback. In industrial automation, this unit enables precise speed and torque control so milling, drilling, or grinding operations can follow programmed motion profiles.

The drive draws a continuous 150 A of phase current, allowing it to energize large-frame spindle motors without derating. Its intermediate circuit is fixed at 300 VDC, a voltage that matches Indramat power supplies and sets the upper limit for regenerative energy. Thermal loading is controlled by forced cooling, and the integral blower, powered from 115 VAC, pushes air across the heat sink. The permissible ambient temperature range is 5 to 45 °C, and operation remains stable up to 1000 m above sea level where reduced air density still supports airflow. For motion commands, the X4 9-pin connector carries the speed reference, and the X2 37-pin port links NC I/O signals to peripheral logic.

The control loop closes through the feedback interfaces on the front panel. Primary rotor position data enters on the X3, 15-pin motor feedback connector, while an auxiliary channel on the X5, 15-pin socket accepts encoder signals from a spindle or a second motor. Speed regulation is achieved through an analog ±10 V command that reaches the X4 plug, keeping the drive compatible with voltage-based CNC outputs. Because the unit carries no auxiliary interface card, unused bus lanes are absent and internal wiring is reduced. Cabling therefore consists only of encoder leads, the X2 NC I/O harness, power conductors, and the dedicated blower power supply.