Product Description:

The KDA 3.1-050-3-LPS-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It is designed to regulate high-speed spindle motors in CNC machines and machining centers by converting a fixed DC bus into a controllable three-phase output. This allows rotational speed to follow electronic commands during cutting, drilling, and other continuous-duty machining processes. The unit serves as the power stage between the control system and the motor, supplying the torque and speed response needed for precise spindle operation.

The drive operates from a 300 VDC intermediate circuit and can deliver a continuous phase current of 50 A, giving it suitable capacity for spindles that draw high current during acceleration. Internal thermal management uses a 220 V/50-60 Hz auxiliary line to power a mounted heatsink blower, and this provides forced cooling for the power section. Within an ambient temperature range of 5 to 45 °C, the airflow helps keep semiconductor temperatures within normal operating limits. Stable cooling supports consistent current control during rapid speed changes and prolonged spindle operation.

The drive can be installed at elevations up to 1000 m above sea level without output correction. Communication with higher-level control equipment is available through a Serial interface (RS 232 C), which can be used for diagnostics and parameter access. A dedicated second encoder input accepts spindle position feedback or an auxiliary motor encoder for applications that require additional feedback channels. Velocity commands are transferred through the SERCOS Interface, allowing synchronized communication with other compatible drive components on the motion network. This arrangement supports coordinated spindle control and orderly signal exchange in multi-axis machine systems.