Product Description:

The TDA 1.1-050-3-AP0 main spindle controller is produced by Bosch Rexroth Indramat for the TDA Main Spindle Controllers series. It regulates spindle motors in machine tools, delivering closed-loop speed and position control so the cutting process maintains commanded feed rates and surface finishes. By converting stored DC bus energy into three-phase motor power while processing encoder feedback, the unit serves as the core drive for spindle applications that require stable speed control during acceleration, cutting, and deceleration. This arrangement allows the controller to react to changing spindle load quickly while maintaining coordinated motor operation.

The controller is rated for 50 A peak output, and its continuous output is limited to 35 A to keep the power stage within thermal limits. Its intermediate circuit operates at DC 300 V from a shared supply, while internal diagnostics use a ±15 V test rail with 160 mA draw and a 24 V logic rail that supports 1.2 A of load current. Speed references are accepted as an analog ±10 V command and pass through a programmable filter before the PWM stage. A 37-way D-sub connector carries control I/O signals, and a separate 15-pin socket handles motor feedback, with the encoder channel able to switch between spindle feedback and a second motor channel. No additional interface card is fitted, which keeps the connection layout simple inside the cabinet.

Mechanical installation uses a vertical orientation that aligns the heat sink fins with natural convection. The housing has an IP 10 protection rating, so the cabinet should provide filtered airflow and keep the unit away from direct coolant mist. Reliable operation is specified up to 1000 m altitude and 70% mean relative humidity, and current limits are reduced as ambient temperature increases until the upper operating limit is reached. With a mass of 10.5 kg, the drive adds useful thermal mass while remaining practical to mount in standard control cabinets.