Product Description:

Bosch Rexroth Indramat manufactures the TDA 1.1-100-3-A0D within the TDA Main Spindle Controllers series. This unit is a dedicated current regulator that works between a machine-tool CNC and the main spindle motor. It converts drive commands into precise phase currents so the spindle can maintain programmed speed and torque during cutting, boring, or grinding tasks in automated production cells.

The controller delivers a peak output of 100 A and sustains a continuous effective phase current of 70 A, allowing large acceleration gaps without thermal overload. It receives velocity or torque references as an Analog ±10 V command and modulates its transistor bridge against a link circuit rated at 300 VDC. An integral fan uses cabinet air cooling, so heat is removed by airflow inside the control cabinet rather than by an external heat sink. The card edge provides a 16-bit parallel additional interface for high-resolution setpoints, and there is no supplementary encoder input because spindle position feedback is handled elsewhere in the drive train. The enclosure has an IP 10 rating, the mounting plate is fixed vertically, and Humidity Class F materials help protect internal laminations from moisture.

Auxiliary supplies include a 24 V logic rail that the unit loads at 1.4 A and a ±15 V sensor rail that draws 160 mA for internal signal conditioning. Reliable operation is permitted at ambient temperatures up to +45 °C, while derated output applies only as temperatures rise toward the reduced-rating ceiling of +55 °C. The design tolerates 95% relative humidity in the Class F envelope and maintains performance at installation altitudes up to 1000 m without additional cooling margins. Overall transport and panel integration are simplified by its 10.5 kg weight, and the absence of encoder wiring helps reduce cabinet routing complexity.