Product Description:

The KDA 2.1-100-3-DQS-U1 module is built by Bosch Rexroth Indramat for the KDA Spindle Drives series. This unit serves as the dedicated power amplifier that links a constant DC bus to high-speed spindle motors used in milling, drilling, or grinding equipment. By adjusting motor voltage and frequency on demand, it supports rapid speed changes and torque control that are essential for precise material removal, tool change cycles, and positioning moves within automated machine-tool environments. Its role in the drive train allows the spindle to respond quickly to control commands while maintaining stable operation during changing cutting loads.

The drive draws its main energy from a 300 VDC link and can deliver a continuous phase output of 100 A, giving it the current capacity needed for heavy spindle starts and sustained cutting loads. Thermal management is handled by a mounted blower that operates from a dedicated 115 V/50–60 Hz AC source, and air is forced across the external heat sink so internal components remain within normal operating limits during prolonged duty. Speed references arrive as a Digital 16-bit parallel word, allowing controllers to request precise spindle speed without the drift associated with analog signals. The unit uses forced cooling, so the cabinet must provide a clear airflow path at the blower intake and exhaust.

Installation conditions specify an ambient range of 5 to 45 °C, and the permitted altitude is 1000 m above sea level so that cooling performance remains consistent with the intended design envelope. For parameter access and diagnostics, a serial interface (RS-232 C) is available for connection to service software or an operator terminal. The unit is a Spindle Drive and is intended to be paired with dedicated spindle feedback cards and safety circuits rather than with general-purpose servo axes. These operating limits should be observed whenever the drive is installed in enclosed machine cabinets or on production equipment with limited airflow.