Product Description:

The KDA 1.1-150-300-W1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Identified as series 1, version 1, the module is installed between a common DC bus supply and a high-speed spindle motor, converting bus energy into controlled three-phase output. It provides velocity and torque regulation that is essential for milling, drilling, and grinding centers, and its internal control electronics coordinate with CNC commands to maintain constant spindle performance throughout demanding duty cycles.

The drive is powered from a DC bus of 300 VDC and can deliver up to 150 A of output current to the connected motor. Thermal management relies on forced-air cooling, and the integral blower is rated for 220 VAC, moving air through the heat sink to keep semiconductor junctions below design limits. An internal logic rail supplies 1 A at 24 V for encoder reference signals, relay coils, and diagnostic LEDs. Field devices that need process feedback can be tied to the signal output terminals, which can source up to 50 mA without exceeding drive limits. This combination supports stable control of large-frame spindle motors during rapid acceleration and sustained cutting loads while also powering low-voltage support circuits inside the system.

Installation is limited to an ambient operating range of 5 to 45 °C and a maximum cabinet altitude of 1000 m above sea level, conditions that help preserve cooling efficiency and prevent corona discharge in the power stage. The analog monitor port tolerates a load of 5 mA, allowing safe connection of meters or chart recorders for real-time process tracking. Integrated thermal sensors trigger a shutdown if the motor winding reaches 155 °C, protecting stator insulation from heat damage. These limits apply to cabinet airflow, external monitoring connections, and motor thermal protection during normal operation.