Product Description:

The KDA 2.1-150-3-APS-U1 is a spindle drive module from Bosch Rexroth Indramat in the KDA Spindle Drives series. It converts a constant DC link into controlled three-phase power so a machine-tool spindle can follow programmed speed and torque references. Integrated in a modular cabinet, it pairs with servo axes yet handles the main spindle channel, delivering the high current and acceleration demanded during cutting, grinding, or boring cycles in automated machining centers. This arrangement lets the spindle operate within a coordinated drive system while remaining dedicated to the higher-power demands of the machining process.

The power section is energized from a shared DC bus at 300 VDC; from that source it can deliver a continuous output of 150 A, allowing direct connection of high-power spindles without external converters. A dedicated heat sink blower maintains semiconductor temperatures, and the blower itself is supplied from an auxiliary line of 115 V/50-60 Hz. The rear panel includes a mounted heat sink blower, which simplifies cabinet integration and keeps airflow consistent across the cooling path. Spindle velocity is set through an analog speed command, so existing CNC controls with ±10 V outputs can drive the module without protocol conversion and can be connected without adding a separate communication interface.

Thermal management is further supported by forced cooling, which moves air across the heat sink regardless of load and keeps internal components within an ambient range of 5 to 45 °C. Installation sites up to 1000 m above sea level are acceptable before derating is necessary, which suits most factory locations. For supervisory and diagnostic tasks, the front panel exposes a serial interface (RS-232-C), and an additional encoder socket permits secondary spindle feedback or auxiliary motor feedback without external adapters. This front-panel arrangement keeps communication and supplemental feedback connections on the module itself.