Product Description:

The KDA 2.1-150-3-DY0-W1 spindle drive is manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Installed in machining centers, it converts the regulated DC bus from an external supply into three-phase output while executing speed commands from the CNC controller. By forming the electrical link between numerical control hardware and the motor spindle, the unit allows precise acceleration, braking, and steady-state rotation during milling, drilling, and grinding operations. It is suited to spindle axes that alternate between rapid speed changes and long periods of continuous rotation.

The drive is energized from a regulated bus of 300 VDC, so cabinet components must be rated for that potential. Its inverter section delivers a continuous output of 150 A, giving the spindle enough torque for heavy metal removal. Thermal energy created by switching losses is extracted through a mounted heat sink blower; this assembly operates in forced cooling mode to keep semiconductor temperatures within design limits. The blower draws power from a dedicated 220 V/50–60 Hz line instead of the DC link, which simplifies fault isolation. The unit is in series 2 and includes no additional interface option, so all user wiring remains on the standard terminal strip of the base model.

For motion control, the speed reference arrives as a 16-bit digital parallel word, and the unit can close a secondary loop through a second encoder input and a synchronous input when higher positioning accuracy is needed. This arrangement supports spindle applications that use supplemental feedback for tighter control during demanding machining cycles. Site conditions are bounded by an ambient range of 5 to 45 °C and mounting up to 1000 m above sea level. Operation outside those limits can require output derating and reduce cooling effectiveness.