Product Description:

The KDA 3.2-150-3-A01-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for high-speed machining centers, this drive regulates induction or synchronous spindle motors by converting a fixed DC bus into variable-frequency and variable-amplitude output. Within an automation cell, it commands spindle torque and speed so cutting, drilling, or grinding operations follow programmed setpoints supplied by the CNC controller. This operating method helps the machine hold the requested spindle behavior while cutting conditions change during a cycle.

This model operates from a DC link of 300 VDC, a value delivered by the shared supply module that feeds multiple axes. At a continuous output of 150 A, the unit can sustain the current demanded by large-frame spindles during heavy material removal. Thermal energy is removed through a mounted heat sink blower; this fan receives its own single-phase supply of 220 V at 50/60 Hz, so airflow remains independent of the drive load. The drive uses forced cooling, which helps keep semiconductor junction temperatures within acceptable limits when ambient heat or cabinet density is high. Speed reference signals reach the drive through an analog voltage interface, and there is no auxiliary encoder channel for master-slave feedback.

The electronics maintain full accuracy between 5 °C and 45 °C, which covers the normal ambient range expected in industrial machine enclosures. Altitude must not exceed 1000 m above sea level to avoid derating of the heat sink blower. Command data arrive as an analog value, which simplifies retrofits with legacy CNC controllers that output a ±10 V speed signal. Because the drive does not include an additional input for a second encoder, spindle orientation or rigid tapping must rely on the primary feedback connection provided by the KDA interface. The type code also indicates the control revision used for this unit.