Product Description:

The KDA 2.1-050-3-AQS-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts the DC link power of an Indramat supply module into a precisely regulated three-phase output that governs high-speed machining spindles. The unit receives speed references from a CNC controller, modulates current accordingly, and maintains constant torque during drilling, milling, or grinding operations. Its control behavior is suited to machine tools that require stable spindle response during speed changes and varying cutting loads.

The drive draws continuous motor current up to 50 A, which limits the maximum steady-state torque the connected spindle can deliver. Its intermediate circuit is energized from a common bus at 300 VDC, which permits coordinated operation with other Indramat axis modules on the same DC link. A dedicated heat sink blower is supplied from an auxiliary line rated at 115 V/50-60 Hz, so cooling airflow remains stable even when the main DC bus is unloaded. Speed commands enter the controller as an analog voltage, allowing direct coupling with standard ±10 V CNC outputs. Installation sites can be located up to 1000 m above sea level without derating, provided normal cooling airflow is maintained.

The electronics operate within 5 to 45 °C, allowing the drive to be used in most industrial enclosures with controlled ambient conditions. Heat is removed by a mounted heat sink blower on the rear panel; this assembly provides forced cooling and directs exhaust air outside the cabinet. Process diagnostics are handled through a serial interface (RS-232-C), which supports standard communication for setup and monitoring. Separating the cooling air path from the cabinet interior also helps keep heat generated by the power section from building up around nearby control components.