Product Description:

The KDA 1.1-150-3-A00-W1/115 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts a fixed DC link into controlled three-phase output so that high-speed machine-tool spindles can follow velocity commands with minimal lag during cutting, drilling, and finishing operations in precision machining centers. By integrating current regulation and thermal supervision into one housing, the unit supports stable spindle behavior during long production runs and reduces the need for separate external monitoring hardware. Its dedicated heatsink blower also helps the drive remain suitable for continuous-duty use in cabinets where spindle acceleration and deceleration occur repeatedly throughout the work cycle.

The power section operates from a DC link of 300 VDC, which feeds the internal inverter stage that drives the spindle motor. It has a continuous output capability of 150 A, so the unit can supply substantial motor current without thermal derating under normal operating conditions. The heatsink blower uses an auxiliary supply of 220 V at 50/60 Hz, keeping the cooling circuit separate from the main DC power path and helping maintain predictable thermal behavior. Heat is removed by a mounted heatsink blower using forced cooling rather than natural convection, and safe operation is permitted at ambient temperatures from 5 to 45 degrees Celsius.

The drive can sustain full ratings up to 1000 m above sea level, after which lower air density can reduce cooling effectiveness. Speed reference is provided as an analog voltage input, which allows the unit to work with legacy control systems that send conventional spindle command signals instead of digital network data during retrofit installations. The unit has no additional interface option, so only the standard control terminals are present on the drive. The second encoder channel is not included, which fits applications where spindle position or speed is monitored by external feedback hardware or by the main control system.