KDA 2.1-100-3-DYS-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-100-3-DYS-W1 is a spindle drive from the KDA Spindle Drives series. It features a rated current of 100 Amps and operates with a DC supply voltage of 300 VDC. The unit uses forced cooling with a mounted heatsink blower and provides a serial interface (RS 232 C) as well as a digital 16 bit parallel speed command value.
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Product Description:
The KDA 2.1-100-3-DYS-W1 belongs to the KDA Spindle Drives series developed by Bosch Rexroth Indramat for controlling three-phase asynchronous or synchronous spindles in CNC machines and machining centers. By converting rectified DC bus energy into a regulated output, the unit provides velocity and torque control that is closely coordinated with the machine’s numerical controller, which helps the spindle follow commanded speed changes during cutting, indexing, tool changes, and orientation tasks without losing the responsive behavior expected in CNC equipment. It uses a dedicated heat sink blower and a microprocessor gate array so that high-speed spindle positioning, acceleration, and braking can be carried out with stable thermal and electrical performance in automated production lines where repeatable spindle response and consistent output are important.
The power stage is rated for a continuous phase current of 100 A and operates from a regulated bus voltage of 300 VDC, giving the inverter enough electrical capacity for demanding spindle duty. The speed setpoint reaches the control electronics as a digital 16-bit parallel value, giving the controller fine resolution across the operating range and supporting smooth command changes from the higher-level control during both steady rotation and rapid transitions. Internal losses are removed by a mounted heat sink blower supplied with 220 V 50/60 Hz power, and the unit uses forced cooling to support full-load operation when cabinet airflow and temperature stay within the required range, which helps the power semiconductors remain within their intended operating conditions during extended machining cycles.
The drive maintains rated performance in ambient temperatures from 5–45 °C and at elevations up to 1000 m above sea level, making it suitable for typical indoor industrial installations used for machine tools and related spindle systems. Operating data and diagnostics can be exchanged through the built-in RS-232-C serial interface, which supports setup, status access, and fault review from connected control equipment without adding a separate communication module. A second encoder input supports spindle-synchronous functions such as C-axis interpolation and orienting in multi-axis machining centers, where precise angular relationship to machine motion is needed for functions that depend on accurate spindle angle feedback.
