Product Description:

The PSI62C0.778-W1 is a medium-frequency inverter positioned within the PSI Frequency Inverters series and produced by Bosch Rexroth Indramat. As a medium-frequency power source, it converts three-phase mains energy into a controlled output that drives induction heating coils, forging presses, or other processes that need adjustable kilohertz currents. Integration of this device in automated cells allows precise thermal cycles while keeping the power stage inside a water-cooled cabinet suited for production lines that require continuous duty.

Operating from a mains supply of 400 - 480 VAC, the inverter draws up to 220 A on its input terminals, which accept copper busbars with a 95 mm² cross-section to minimize resistive heating. The power stage is water cooled, so heat is removed directly through a stainless circuit instead of relying on ambient airflow. For safe operation, the cooling circuit may reach 10 bar pressure, and inlet temperature must stay below 30 °C to keep semiconductor junctions within limits. A TriCore processor supervises modulation and diagnostics, while Ethernet I/O and an EtherNet-based timer synchronize firing patterns with the plant controller.

Installation inside an enclosure carries a IP20 protection rating, which is suitable for clean electrical rooms. Up to 256 user programs can be stored, allowing distinct heating curves for different recipes. The converter can supply a primary current of 1200 A, and when paired with a PSG 3100 transformer its secondary side can deliver 54 kA (PSG 3100) for short intervals required by inductive loads. Continuous cabinet dissipation is limited; switch-cabinet basic losses are 69 W, rising to 210 W at maximum inverter duty, while cooling losses may peak at 700 W. A minimum water flow of 4 l/min produces a 0.6 bar pressure drop, keeping the coolant velocity sufficient to extract the listed heat.