Product Description:

The KDA 2.1-150-3-AP0-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It regulates the torque and speed of machine-tool spindles, translating motion commands from a CNC controller into precisely timed current pulses for the connected motor. With its own heat sink blower and field-oriented control circuitry, the unit serves as the power stage between the DC bus of an Indramat supply module and the position feedback from the spindle encoder. This arrangement supports controlled acceleration, steady running speed, and accurate spindle response during milling, drilling, and other machining processes.

The power section operates from a 300 VDC link and is rated for a continuous output of 150 A. To remove switching losses, the heat sink blower requires a separate supply of 220 V at 50/60 Hz. The unit uses a mounted heat sink blower, and cooling is provided by forced cooling to help maintain thermal stability during long duty cycles. Spindle velocity is referenced through an analog command voltage, while an unbuffered second-encoder socket accepts incremental or absolute feedback when spindle orientation or auxiliary motor alignment is required. This additional feedback channel supports spindle orientation or synchronized auxiliary functions without changing the main command input.

The drive operates in ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level. It is part of Series 2 in the KDA line, so it uses the same mounting holes, bus connectors, and parameter structure as other drives from that generation. The drive has no additional interface option, so only the standard power, control, and encoder connections are used. These operating conditions should be considered when the unit is installed in enclosed cabinets or in locations with reduced airflow.