Product Description:

The KDA 2.1-150-3-A00-W1-220 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. Within a machining cell or production line, the unit converts regulated DC-bus power into a three-phase output for high-speed motorized spindles, allowing precise speed and torque regulation during cutting, drilling, or grinding operations. The drive is intended for machine tools where spindle response must remain stable as cutting load changes from idle to full engagement. By regulating motor current and output frequency, it helps maintain consistent spindle behavior during roughing, finishing, drilling, and similar operations. Speed references reach the control board through an analog input channel, so the unit fits control systems that use direct command signals from a CNC or motion controller.

The power stage is engineered for a continuous output of 150 A, so matched spindles can draw substantial current during demanding cycles without drive saturation. Incoming energy arrives from a shared DC link at 300 VDC, which matches the bus arrangement used in multi-axis cabinets. The shared DC-bus approach also allows the drive to operate alongside other motion modules in the same enclosure. A dedicated heat sink blower is powered by an auxiliary supply of 220 V/50/60 Hz, and thermal management uses a mounted heat sink blower with forced cooling to move air directly through the fin stack whenever the drive is enabled. Constant airflow across the heat sink helps the power semiconductors remain within their operating range during long cutting passes and repeated acceleration. No additional interface option is fitted, and a second encoder socket is not included, which keeps the connection layout straightforward.

Operation is permitted at ambient temperatures from 5 to 45 °C, so the cabinet must stay within that range during use. Installation altitude is limited to 1000 m above sea level, because thinner air reduces cooling effectiveness. The command channel accepts an analog velocity signal, allowing the drive to receive a standard voltage reference from the control system. Because the command path is analog rather than network-based, the unit is well suited to systems that use direct spindle references from legacy CNC hardware. The unit is Series 2, which marks the release used for this version. The design is focused on spindle regulation, with no extra fieldbus ports or encoder expansion.