Product Description:

The KDA 3.1-050-3-LQD-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. In an automation cell the unit modulates DC bus power so machine-tool spindles can accelerate, maintain speed, and decelerate under closed-loop control. By converting the plant’s rectified supply into precise three-phase outputs, it lets cutting, drilling, or grinding equipment follow programmed speed profiles without mechanical clutches. This model belongs to the third hardware generation, giving compatibility with companion motion controllers that share the same cabinet bus structure.

Core electrical parameters define the operating envelope. The internal power section works from a DC bus of 300 VDC, and it can deliver a continuous phase current of 50 A to the spindle motor. Heat produced at this load is removed by a 220 V/50–60 Hz fan that is mounted directly on the rear fin stack. That assembly—specified as a Mounted heatsink blower—teams with the drive’s enclosure channels to provide Forced cooling, keeping semiconductor junction temperatures within limits during rapid duty cycles. With these provisions, the drive sustains full current without derating while supporting fast torque rises demanded by high-speed machining.

Installation constraints are equally important. The electronics remain within specification when ambient air lies between 5 to 45 °C, and performance is guaranteed up to 1000 m elevation where thinner air still permits adequate convection through the blower path. Velocity commands reach the controller over the SERCOS interface, while position loop data can be supplied through a Position command value, digital channel. Together these interfaces allow coordinated spindle orientation and tapping sequences without additional hardware, and the Series 3 architecture lets the unit drop into existing Indramat multi-axis cabinets without rewiring the common 300 V bus.