Product Description:

The KDA 3.3-050-3-A00-W1 is a Bosch Rexroth Indramat power module built for main-spindle control within the KDA Spindle Drives series. By converting regulated DC-link energy from the machine power supply into three-phase output, the unit delivers closed-loop speed and torque control to high-speed machining spindles used in CNC centers and automated production cells. This arrangement supports precise spindle acceleration, steady cutting speed, and controlled deceleration during machining cycles. It is intended to operate with modular drive components so spindle motion can be coordinated with feed axes and higher-level machine control.

Electrical performance includes a continuous output of 50 A supplied from a stabilized link voltage of 300 VDC. The internal control accepts an analog speed reference, so upstream controllers can vary spindle speed through a proportional command signal rather than a discrete preset. Thermal dissipation relies on forced cooling, and the airflow system is powered from an auxiliary supply of 220 V/50-60 Hz connected directly to the drive. This cooling method helps the power section maintain stable operation during sustained spindle loading, frequent acceleration changes, and other duty cycles that generate heat in the output stage.

The drive operates in ambient temperatures from 5 to 45 °C and at installation heights up to 1000 m without derating. Cooling is provided by a mounted heat sink blower on the rear panel, which removes heat without requiring external ducting in the cabinet. The electronics include no additional interface option, and the second encoder socket is omitted, so wiring is limited to the primary resolver feedback path. The unit belongs to series 3 and uses a single DC bus that matches the common supply structure used in Indramat machine tools.