Product Description:

The PSI65C0.732-W1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts the plant’s three-phase supply into a controlled medium-frequency output that energizes induction heaters, hardening stations, or other automation modules that require high secondary current. Integrated control electronics, power semiconductors, and a water jacket are combined in one cabinet, so the inverter can be installed as the primary interface between the mains transformer and the tuned load circuit.

The power section operates from 400 – 480 VAC, and its logic circuits are fed by a separate 24 V DC control supply. A switching clock of 1 kHz sets the pulse pattern that the IGBTs use to synthesize the medium-frequency waveform. Continuous load is handled by a nominal system current of 660 A, while transient peaks can reach 2400 A without exceeding thermal limits. Cable terminations up to 120 mm² fit the output bars, and M10 connection bolts secure the bus links. Cabinet dissipation is 100 W at idle and 850 W at maximum power, and an EtherNet timer synchronizes the inverter with external controllers while an M16 × 1.5 thread provides a dedicated return path for the cooling water loop.

Heat is extracted through a water-cooled plate, and the circuit needs 10 l/min of flow while the inlet temperature must not exceed 30 °C to keep semiconductor junctions within limits. Total cooling loss can rise to 4400 W, so the cooling circuit must be able to remove that heat during operation. The housing has an IP 20 degree of protection and is specified for ambient temperatures up to 45 °C. It may be installed at altitudes as high as 2000 m without derating. For applications using a PSG 3100 secondary, the unit can deliver a maximum secondary current of 120 kA to support short-duration forging or heating surges.