Product Description:

The Bosch Rexroth Indramat KDA 3.1-150-3-DQD-U1 is a spindle drive within the KDA Spindle Drives series. As a closed-loop power module, it supplies controlled three-phase power to high-speed machining spindles and relays real-time speed data to the machine controller. The unit serves as a drive axis in automation centers, converting the fixed DC bus of an Indramat supply module into variable-frequency output for demanding metal-cutting or woodworking operations with repeatable spindle control.

In operation, the drive is supplied from a fixed 300 VDC link and can deliver up to 150 A of continuous output current to the spindle windings. The heat sink blower is energized by a dedicated 115 V/50-60 Hz auxiliary source, separating cooling power from the DC bus and preventing additional loading of the supply module. Airflow is managed by forced cooling, so the unit can support long duty cycles without relying on natural convection. Velocity references arrive through a 16-bit parallel digital speed command, enabling the CNC to set spindle speed in 65,536 discrete steps without analog drift. The hardware is design version 3 and integrates with Indramat supply units that share the same DC bus architecture.

The remaining ratings cover cabinet conditions and installation limits. The control electronics operate over a range of 5 to 45 °C, allowing cabinet air conditioning to be set to normal shop values. Performance is maintained up to 1000 m above sea level, above which current derating is required to offset reduced air density. A rear-mounted heat sink blower is fixed to the housing, forming a self-contained duct that channels exhaust air directly across the power modules. For motion sequences that require exact spindle orientation, a digital position command input is provided so the numerical control can send incremental position references independent of the main speed loop.