Product Description:

The PSI62C0.765-W1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. In automated welding generators, induction heaters, or shrink-fit stations, the unit converts a three-phase mains supply into a high-frequency, pulse-width-modulated output suited to matching transformers and work coils. Its water-cooled construction allows the inverter to be mounted inside a cabinet while keeping semiconductor junction temperatures within operating limits during continuous use.

At the input, the inverter accepts a line voltage of 400 – 480 VAC and draws a nominal mains current of 220 A during rated production cycles. Inside the cabinet, transistor switching produces base heat dissipation of 69 W. At maximum duty, cabinet losses rise to 700 W, so forced coolant flow is required. The primary inverter section can handle up to 1200 A of instantaneous current, while the galvanically isolated secondary circuit linked to a PSG 3100 transformer can reach a short-duration peak of 54 kA (PSG 3100). A 24 VDC auxiliary supply rated at 2 A powers the control electronics and the EtherNet timer that sequences welding or heating profiles, and the output waveform is maintained through 1 kHz high-frequency switching.

Thermal removal relies on water moving through the internal channels, and a minimum flow of 4 l/min keeps component temperatures stable and helps prevent derating. With this flow, the pressure drop across the inverter’s coolant path is limited to 0.6 bar, enabling integration into central plant circuits without additional pumps. The unit has an overall depth of 280 mm, a height of 653 mm, and a width of 288 mm. These dimensions fit standard 600 mm switchgear frames alongside matching rectifiers, filters, and protective contactors. The mains connection requires a conductor cross-section of 95 mm².