Product Description:

The Bosch Rexroth Indramat KDA 3.2-050-3-L0S-W1 belongs to the KDA Spindle Drives series and is listed as series 3, version 2. This drive is built for closed-loop control of high-speed machining spindles in CNC systems and other automated production lines, where accurate speed regulation is critical to surface finish and process stability. It converts energy from a regulated DC bus into a synchronous three-phase output that follows digital speed commands from the control system. By combining power electronics, control logic, and a dedicated heatsink assembly in one unit, it helps simplify cabinet layout while maintaining spindle torque accuracy during changing loads.

The power stage can deliver up to 50 A of continuous output current to the spindle motor and operates from a 300 VDC intermediate circuit. Its integral cooling blower uses an auxiliary supply of 220 V at 50/60 Hz, which keeps the cooling circuit separate from the main DC link. Cooling is provided by a heatsink-mounted blower, and the unit uses forced cooling so heat is removed from the semiconductors during sustained spindle operation. This arrangement supports stable thermal behavior when the spindle runs for extended periods at high speed or under repeated load changes.

The drive operates in ambient temperatures from 5 to 45 °C and can be installed at elevations up to 1000 m above sea level without derating. A serial interface (RS-232C) is available for diagnostic access, while the speed loop accepts setpoints over the SERCOS interface. These connections allow the unit to integrate with multi-axis control systems while still providing a dedicated service channel for status checks and diagnostics. Because the drive does not include a second encoder input, any application that requires spindle-mounted feedback must route that signal through the primary channel, so the unit is limited to a single-encoder arrangement.