Product Description:

The KDA 3.2-100-3-A0S-W1-220 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. It converts the fixed DC bus from an Indramat supply module into the variable three-phase output required to run high-speed machine-tool spindles. Through closed-loop regulation, it manages torque, acceleration, and braking so that machining processes remain accurate under load fluctuations and changing spindle demand in demanding machining applications.

This drive draws power from a DC link rated at 300 VDC, and its output devices are sized for a continuous 100 A current to support large-frame induction or synchronous spindle motors. Internal thermal losses are removed by a mounted heat sink blower, and the blower itself is fed from an auxiliary line of 220 V / 50/60 Hz. Airflow is delivered directly across the heat-generating IGBT stack in a forced cooling arrangement, allowing the unit to maintain full current without derating during extended cutting cycles. These electrical and thermal values set the limits for the transformer, cabling, and protective disconnects installed in the equipment cabinet.

Stable operation is specified for ambient temperatures of 5 to 45 °C and installation heights up to 1000 m above sea level. Within these limits, the cooling system can sustain the drive’s semiconductor junction temperatures. A serial interface (RS-232 C) supports parameter downloads and diagnostic queries without opening the enclosure during routine setup and diagnostics. The spindle controller expects its velocity reference as an analog voltage, enabling straightforward integration with legacy CNC controls that supply ±10 V command signals. A secondary encoder channel is not provided, so position feedback is taken exclusively from the primary spindle encoder.