Product Description:

The PSI 63C0.776L1 is a medium-frequency inverter built by Bosch Rexroth Indramat for the PSI Frequency Inverters series. As a power conversion module, it feeds induction heating generators, welding systems, and other industrial loads that require controllable medium-frequency energy. By transforming three-phase mains power into a high-frequency output, the unit enables precise thermal or mechanical processing while coordinating with supervisory controls through its Ethernet/IP fieldbus interface.

During operation, the inverter accepts three-phase input within a range of 400 – 480 VAC. Under nominal conditions, it draws 110 A from the supply, yet its primary power stage can momentarily tolerate up to 800 A to handle load surges. The internal power electronics modulate the output at 1000 Hz, giving tight control of coil or transformer currents used in process equipment. Thermal dissipation is managed by an air-cooled design with a basic cabinet loss of 69 W, which rises predictably with load. Communication to the PLC is accomplished with the integrated Ethernet/IP port, and discrete sequencing is supported by the E/A_DISKR2ED I/O module. Wiring to the mains bus requires a minimum conductor cross-section of 35 mm² to maintain permissible conductor temperature.

The cabinet loss reaches 170 W at maximum rated output, so airflow sizing must account for this worst-case heat load. Secondary protection is provided by the inverter’s output transformer path, which can deliver up to 36 kA on a PSG 3100 line but disconnects rapidly through a potential-free stop circuit. That circuit is energized through a 24 VDC, 3 A contact and simplifies integration with emergency-stop chains that require galvanic isolation. Field wiring is terminated on spring clamps that accommodate conductors up to 50 mm², allowing short, low-impedance connections to busbars. The stop circuit uses a potential-free contact, which helps prevent unwanted ground references during safety interruptions.