Product Description:

The PSI65C0.780-W1 medium-frequency inverter is produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It is designed to supply regulated medium-frequency power to induction heating, welding, or melting equipment used on automated lines. Acting as the interface between the utility supply and the resonant load, the unit converts constant mains energy into a controllable current waveform, allowing precise heat profiles and fast cycle times in continuous or batch processes. Its construction is intended for integration into water-cooled electrical cabinets common in high-power metallurgical and forming installations.

Electrically, the inverter accepts three-phase 400–480 VAC and maintains its internal logic with a 24 V DC control supply. A switching frequency of 1 kHz sets the modulation pattern for the output H-bridge. Nominal system current is 660 A, yet the power stage can supply up to 2400 A during short overload intervals demanded by dynamic loads. Protection against accidental contact is provided by the IP20 enclosure class, and communication functions are handled through an Ethernet interface. Power conductors with a cross-section of 120 mm² are clamped under M10 bolts, which helps maintain low-impedance paths from the inverter to the bus bars.

Thermal performance depends on a water circuit that circulates 10 l/min through M16 × 1.5 connections, and the inlet temperature may reach 30 °C without compromising device life. The coolant removes a base cabinet loss of 100 W, rises to 850 W at full load, and tolerates a peak dissipation of 4400 W. Ambient air surrounding the chassis can reach 45 °C provided at least 100 mm of clearance is left on all sides. For very brief pulses, the secondary circuit can withstand currents up to 120 kA, extending the inverter’s usefulness in flash-forging and sintering operations while the water-cooled construction keeps acoustic noise and enclosure temperature low.