Product Description:

The KDA 3.2-050-3-AQD-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series, release 3.2. It supplies controlled power to a motorized spindle so machining centers, grinders, and other automated equipment can regulate cutting speed, perform rapid ramp-ups, and maintain torque under load. By translating reference signals from a CNC or PLC into precise current and voltage, the unit serves as the electrical interface between the motion controller and the spindle. Its control behavior is suited to machine tools that must move quickly to target speed and then hold that speed as cutting conditions change.

In operation, the heat sink blower is fed from an auxiliary source rated at 115 V/50–60 Hz. The main power stage is linked to a DC bus of 300 VDC, and the inverter section delivers up to 50 A of continuous output to the motor windings. Thermal energy is removed through forced cooling, with airflow provided by a mounted heat sink blower bolted directly to the rear of the housing. Active airflow helps keep internal semiconductor temperatures within range during sustained high-speed duty and lowers the chance of temperature-related shutdowns.

The drive can operate in ambient air from 5 to 45 °C without output derating, and cabinet installation is permitted at elevations up to 1000 m above sea level, where thinner air can reduce cooling effectiveness. Speed regulation is commanded through an analog reference channel, while position fine-tuning arrives on a separate interface that accepts a digital position command value. Keeping the speed and position commands on separate inputs allows a controller to overlay positioning corrections on top of spindle speed control. This arrangement is useful when a machine needs continuous spindle rotation along with accurate updates from the higher-level control.