Product Description:

The PSI6300.757-L1 is a medium frequency inverter manufactured by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. It converts three-phase plant power into regulated medium-frequency energy required by induction coils or other process loads in automated cells. By combining power electronics, forced-air cooling hardware, and stored program capability in one enclosure, the unit serves as the central power stage in dedicated production equipment. This arrangement helps the machine deliver repeatable heating cycles while keeping the power section concentrated in a single cabinet location.

It accepts a mains input of 400 – 480 VAC and is synchronized to industrial supplies operating at 50/60 Hz. Its logic and gate drivers use a separate 24 V DC control supply, which keeps low-voltage control functions distinct from the main power path. The power bridge switches at 1 kHz, a rate chosen to balance transformer size and switching losses. Continuous operation is rated at 110 A of system current, while short-duration process demands can rise to 800 A of output. Screw clamp terminals accept conductors from 35 mm² to 50 mm², and an MOV-based overvoltage circuit suppresses surge events on the DC link. The front interface can store and recall up to 256 programs, which supports repeated process changes without manual re-entry of settings.

The enclosure carries an IP20 protection rating, so cabinet installation is required. Cooling air at the heat sink may reach 45 °C Max, and the surrounding ambient temperature can rise to 55 °C before derating applies. The unit weighs 20 kg, giving it a solid cabinet presence without requiring an unusually large mounting area. Timing of power bursts relative to external motion axes is coordinated by an EtherNet timer module, which helps synchronize the heating cycle with the rest of the machine sequence. The air-cooled design removes heat without auxiliary liquid circuits, simplifying installation where only cabinet airflow is available.