Product Description:

The PSI63C0.325-W1 medium frequency inverter is produced by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. In automated lines, it converts three-phase mains power to controlled medium-frequency output for induction heating coils, weld transformers, and similar loads that require fast energy modulation. Its role is to deliver stable current while coordinating with supervisory controllers through the integrated INTERBUS timing channel.

It accepts a three-phase input of 400 – 480 VAC, allowing integration into standard plant supply grids without an isolation transformer. Internally, the IGBT bridge is gated at a control clock of 1 kHz, so output voltage pulses are refreshed every millisecond for tight regulation. Under load transients, the power section can source up to 800 A, and cabinet thermal losses are limited to 69 W, which helps reduce ventilation demand inside the enclosure. The electronics are guarded to IP20, and heat is removed by a closed-loop water-cooled plate. Surge events on the DC link are suppressed by an MOV module, and a 3.6 V backup battery maintains parameter memory. Up to 256 user programs are stored and selected over the INTERBUS timer channel, while power conductors as large as 35 mm² can be landed on the 50 mm² terminal block.

On the process side, the inverter furnishes a nominal system current of 110 A and can energize a welding transformer with secondary peaks reaching 36 kA. The liquid circuit must sustain a flow of 4 l/min through the M16 × 1.5 connection, and the inlet temperature may not exceed 30 °C; these limits keep the power semiconductors within their safe operating area during prolonged duty cycles. Liquid cooling isolates the electronics from cabinet air and supports compact installation near heat-sensitive machinery. It is used in induction hardening stations, billet heaters, and other medium-frequency processes that require precise high-current energy delivery.