Product Description:

The KDA 3.3-150-3-D0I-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Classified as series 3 within that line, the unit regulates high-speed machining spindles by converting a fixed DC bus into controlled three-phase output. In an automation cell, it links the machine controller with the motor so the spindle can follow commanded speed changes, accelerate quickly, and stop in a controlled manner during cutting operations. That behavior is important in milling, drilling, and turning systems where spindle speed must stay consistent as tool engagement changes.

The power section is supplied from a DC bus rated at 300 VDC, and the output stage can deliver a continuous current of 150 A to the spindle motor. Thermal energy from the IGBT stack is removed by a mounted heat sink blower, and the fan is powered from an auxiliary line of 220 V/50–60 Hz. Air moves through fin channels in a forced-cooling arrangement that helps keep semiconductor temperatures within a safe operating range during heavy duty cycles. Separate fan power keeps cooling available independently of the motor output stage, which helps remove heat during long production runs. The speed loop receives its command through a parallel word, so the controller can transfer the reference value directly with minimal delay.

Continuous operation is permitted between 5 to 45 °C and at elevations up to 1000 m above sea level. The speed reference is accepted as a 16-bit digital parallel word, which allows fine command resolution for machining processes that require smooth surface finish and stable spindle response. Feedback to auxiliary devices is available through an incremental encoder output, while the housing does not include a second encoder input. If a dual-loop arrangement is required, an external interface must provide that additional connection. Those operating limits should be observed when the drive is placed near other heat-producing components in a control cabinet.