Product Description:

The PST6250.201-L is a thyristor-based power unit produced by Bosch Rexroth Indramat within the PST Thyristor Power Units series. In automation cells, it fires controlled half cycles to adjust primary-side voltage on heating or magnetizing transformers, converting a fixed three-phase supply into the precise RMS value requested by the supervisory PLC. The design integrates gate-drive electronics, fieldbus interfaces, and machine I/O, so a standalone cabinet can regulate medium-current loads without an external power stage.

It is air-cooled, so ambient airflow removes heat without liquid circuits. The climatic category 3K3 classifies the unit for control cabinets that reach 55 °C with low condensation. A conductor entry sized at 95 mm² accommodates the high mains nominal current of 200 A. The internal supply section offers 24 V DC at 2 A to energize sensors and logic, while a stop circuit contact can switch 3 A at that voltage for emergency shutdown. Protection level IP20 limits finger access and suits enclosed mounting. A maximum duty cycle of 50% sets the on-time-to-cooling-time ratio at full load, and 141 kVA transformer power is available at that setting. Communication uses a Comnet-M-DP module tagged as PROFIBUS ID 9, with bus timing handled by an integrated PROFIBUS timer.

The logic layer stores 256 parameter sets and sequences, selectable on the fly over the fieldbus network. For direct machine interaction, it exposes 16 inputs and 16 outputs, enabling local interlocks and status reporting without extra terminal blocks. When applications call for short, high-power bursts, the connected transformer can deliver 224 kVA at a 20% duty cycle. Reliable operation is maintained up to 2000 m installation altitude, a limit that matches typical plant elevations.