Product Description:

The KDA 3.2-050-3-LQ0-U1 is a spindle drive built by Bosch Rexroth Indramat and positioned within the KDA Spindle Drives series. As a drive module, it converts a regulated DC bus into variable three-phase output for high-speed machine tool spindles, linking the controller and motor in automated machining centers. It provides the current loop, protective functions, and thermal management needed to maintain stable spindle velocity during rapid speed changes and dynamic cutting loads. This type of drive is used where spindle speed must remain consistent during material removal and quick program-controlled transitions.

The drive draws energy from a DC bus rated at 300 VDC and is designed to deliver a continuous output of 50 A, so cabinet layout must account for both electrical supply and heat removal. Thermal control relies on forced cooling, and a mounted heat sink blower exhausts heat directly from the power semiconductors. That blower is powered by an auxiliary feed of 115 V 50/60 Hz, which keeps the cooling circuit separate from the main bus. Closed-loop speed reference data reaches the unit through the SERCOS interface, allowing synchronized spindle commands with other axes while retaining fiber-optic noise immunity. Separating the blower supply from the DC bus helps preserve cooling when spindle demand changes quickly. The drive has no additional interface option, so the communication path remains straightforward across the machine and avoids extra connection points.

Installation is permitted at ambient temperatures from 5 to 45 °C and at mounting locations up to 1000 m above sea level. The drive is in Series 3 and uses version 2 electronics. The series designation identifies the product generation used for this module. Operation outside these limits may require external cooling or output derating to maintain stable performance. These operating conditions match typical enclosed factory installations with controlled ventilation and standard elevations.