Product Description:

The KDA 3.1-050-3-AYI-U1 is a spindle drive manufactured by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. It links the machine control to the spindle motor by converting command signals into regulated armature currents, making it a core component for high-speed cutting, drilling, and grinding operations. Its control behavior suits machine tools that need stable spindle speed during load changes and rapid speed transitions between machining steps.

The power section is supplied from a common DC bus at 300 VDC, and the drive can deliver a continuous phase current of 50 A to match medium-power spindle motors. Thermal energy is removed by a mounted heat sink blower that uses its own single-phase supply of 115 V/50–60 Hz. This arrangement provides forced cooling so the internal semiconductor temperature stays within safe limits during prolonged duty cycles. Speed reference enters the controller as an analog value, while a second encoder input and a synchronous input support phase-locked feedback when multiple axes share the same clock domain. For process monitoring and downstream numerical control, the unit also offers an incremental encoder output that retransmits spindle position to external devices.

The drive operates in ambient temperatures from 5 to 45 °C and at mounting heights up to 1000 m above sea level. Within that operating range, the heat sink blower supports continuous operation without reduced cooling performance. The analog speed command interface allows straightforward velocity scaling from legacy CNC hardware. This layout helps the drive fit systems that need predictable spindle regulation in sealed cabinets or open machine frames where stable signal transfer remains important during continuous production.