Product Description:

The PSI63C0.739-L2 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. Installed in a switch cabinet, it converts high-voltage three-phase mains into controllable medium-frequency output used to energize induction coils, melting furnaces, or other process loads that require tightly regulated electrical power in industrial automation. Its electronic topology replaces mechanical tap changers, allowing fast adjustment of heating or power profiles directly from the plant control system. This makes the unit suitable for thermal processes that need rapid power correction when line conditions or workpiece loading change.

The power stage accepts 480–690 VAC, so it can connect to 600 V class utility feeders without step-down transformers. Under rated conditions it draws 110 A, which sets feeder size and protective device settings. Internal components are air cooled, and the 100 mm installation clearance keeps the exhaust path unobstructed. Total cabinet losses during maximum inverter utilization reach 200 W, which complements the 100 W of static cabinet dissipation. Command and modulation tasks are handled by a TriCore CPU, which issues pulses in real time while exchanging setpoints over Ethernet I/O. A 3 mm housing gasket preserves the IP barrier, and at least 35 mm² of conductor area is required on the mains connection to limit temperature rise.

For short bursts the converter can pass 800 A on the primary side, and the associated PSG 3100 transformer path withstands 36 kA on the secondary. These overloads raise cooling demand to 420 W, still within the capacity of the integrated fans. The line clamp accepts up to 50 mm² of copper, giving flexibility to meet voltage-drop targets on high-current runs. That reserve helps the inverter handle brief demand spikes without interrupting the heating cycle or requiring discrete timing relays. The Ethernet timer also synchronizes energy delivery with the rest of the cell while stable output frequency is maintained during process changes.