Product Description:

The SPM 100-TB inverter module is manufactured by Bosch Rexroth Indramat as part of the SPM Inverter Modules series. It is installed in industrial automation cabinets to drive AC motors, converting command voltages into controlled frequency while supervising current so machinery holds speed without overheating. The unit interfaces with motion controllers in conveyor, packaging, and material-handling stations, where electronic speed regulation and built-in thermal supervision help maintain stable production cycles. This combination lets the drive respond to load changes while keeping the motor within its intended operating range.

The module’s protection chain centers on its 5 Hz I2t frequency threshold, meaning the current-squared integration resets five times per second to track winding heat. If accumulated energy still reaches the limit, a shutdown occurs after a 2 s I2t trip delay. A pre-alarm appears 0.5 s earlier as an I2t warning lead, giving the controller time to reduce load before a trip occurs. At very low shaft speeds, the phase current is capped at 0.9 × IN eff, preventing localized saturation. Control logic and sensors are powered by a dedicated 24 V output supply, so monitoring remains active even when the main power stage is de-energized.

Velocity tracking augments the thermal model and gives the control section a separate check on actual shaft behavior. Motion is recognized within 50 ms, the position detect time, and true standstill applies below the 20 rpm standstill threshold. The evaluation mode switches at the 300 rpm changeover point; below that mark, tolerance is ±20 rpm, while above it the band narrows to ±7 % of ns to support accurate high-speed processes. The analog scaling can be checked at the 7.8 V = SWmax setpoint test point, which represents the maximum speed command. These thresholds support speed supervision during acceleration, low-speed holding, and steady running.