Product Description:

The TDA 1.1-50-3-API is a main spindle controller produced by Bosch Rexroth Indramat within the TDA Main Spindle Controllers series. The unit serves as a drive interface between an automation system and a machine tool spindle, converting analog velocity commands into precise three-phase power for high-speed machining applications. By integrating encoder feedback and internal control loops, it regulates spindle speed, torque, and position so that machining centers maintain repeatable tolerances during production.

Electrical capability begins with a rated output of 50 A, while continuous operation is sustained at 35 A to match the thermal capacity of the power stage. A stabilized link voltage of 300 VDC feeds the inverter bridge, supplied from a common DC bus that also delivers 15 V at 160 mA for logic circuits and 1.2 A at 24 V for contactors and sensors. The controller accepts a differential speed reference of ±10 V, allowing standard CNC controls to issue velocity setpoints without additional signal conditioning. The blower supply is kept separate from the drive electronics, which helps prevent the cooling circuit from loading the low-voltage control functions.

Axis feedback enters through a 15-pin connector, and the drive retransmits data at 360000 Incr/Rev, enabling external counters to monitor spindle position with fine granularity. Internally, the command path interpolates to 1/4,000,000 Rev, which supports micro-incremental orientation moves such as tool change alignment and accurate spindle positioning at standstill. Forced-air circulation uses air inside the control cabinet, and the required blower runs on 220 VAC so no auxiliary transformer is needed. Installation is limited to 1000 m altitude, 55 °C ambient temperature, and a vertical mounting plane, and the IP10 housing is intended for open-rack ventilation. The chassis weighs 10.5 kg, which should be considered when planning slide-in rack support and handling.