KDA 3.1-150-3-LPD-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.1-150-3-LPD-W1 is part of the KDA Spindle Drives series and is designed for use as a spindle drive. It features a rated current of 150 Amps, operates with a 300 VDC supply voltage, and uses a forced cooling system with a mounted heatsink blower. The drive also includes a SERCOS interface for speed command value and supports a second encoder input for spindle or additional motor feedback.
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Product Description:
The KDA 3.1-150-3-LPD-W1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It is intended for CNC systems and transfer lines where a dedicated inverter regulates spindle speed and torque according to machining commands. The unit converts DC-link power into three-phase output for an induction or synchronous spindle motor. Its frame also carries a mounted heat sink blower that removes switching losses generated during high-duty operation.
This model delivers a rated output current of 150 A, so the connected DC bus and cabling must support that continuous load. Its internal power stage is energized from a link voltage of 300 VDC, supplied by the factory DC power module shared with other axes. The heat sink blower is powered by an auxiliary source of 220 V/50–60 Hz, which allows cooling to remain active even when the main DC link is discharged. Thermal removal is provided by forced cooling through the dedicated blower mounted directly on the rear heat-sink fins. Reliable operation is permitted across an ambient range of 5 to 45 °C, covering typical production-floor temperatures, and the mechanical design belongs to hardware series 3.
The command structure relies on a SERCOS interface that transfers real-time speed commands from the machine controller. For position-synchronized applications, a digital position command value port is provided so coarse and fine setpoints can be handled separately. A dedicated second encoder input accepts spindle feedback or an additional motor transducer, which supports monitoring when tool changers or orient positioning are required. Installation sites are limited to elevations below 1000 m so cooling air density remains sufficient for the blower at the specified load.
