Product Description:

The KDA 3.1-050-3-AYS-U1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Within an automation cell, it acts as the power stage for a machine-tool spindle, accepting a regulated DC bus and issuing three-phase output so that cutting or grinding heads keep the programmed speed when the mechanical load fluctuates. This arrangement supports stable spindle operation in machining applications that require consistent speed control during changing process conditions.

The power channel is sized for a continuous output of 50 A, giving the unit the capacity needed for large-diameter tooling. Its internal electronics draw energy from a shared link at 300 VDC, which sets the available bus voltage for the connected motor. Thermal management is handled by a mounted heat sink blower that uses forced cooling. The blower fan motor is supplied separately at 115 V/50-60 Hz, allowing the cooling circuit to remain active even when the DC bus is off. Diagnostic and parameter data can be exchanged over the drive’s serial interface (RS-232C), which allows access without opening the control cabinet.

The drive operates in an ambient temperature range of 5 to 45 degrees Celsius and at altitudes up to 1000 m above sea level without derating. For high-precision machining, the control board provides a second encoder input and synchronous input, allowing the spindle controller to process both motor position and auxiliary axis feedback without external splitters. Speed references are supplied as an analog value, which supports direct connection to legacy CNC outputs that use a 0-10 V signal rather than fieldbus words. This combination of control and feedback connections makes the drive suitable for enclosed, ventilated cabinets used in machine-tool applications with precise spindle coordination.