Product Description:

The PSI64C0.725-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts three-phase mains energy into a controlled 1 kHz output that feeds induction heating coils, resistance welders, or other equipment that needs stable medium-frequency power. The unit mounts in a control cabinet and relies on a closed water circuit to keep internal semiconductor temperatures within safe operating limits during continuous industrial service. It is suited to installations where compact cabinet integration and controlled cooling are both required.

Inside the inverter, a TriCore CPU executes modulation algorithms on a control cycle of 1 ms, so current and voltage are updated every millisecond. Basic cabinet heat loss is limited to 69 W, but the power stage itself is water cooled, allowing higher power density without overheating the enclosure. The supply section accepts three-phase lines rated at 400–480 VAC, and under rated conditions it draws a mains nominal current of 220 A. Closed-loop control helps the inverter respond quickly to load changes during heating and welding processes. The control platform also helps stabilize output during changing workpiece conditions and varying thermal demand.

At maximum load, the internal cabinet dissipation climbs to 210 W, and the dedicated cooling channels must remove up to 700 W from the heat exchangers. To meet that demand, the installation must supply at least 4 L/min of coolant, resulting in a water pressure drop of 0.6 bar across the M16 × 1.5 fittings. On the electrical side, the converter can sustain a peak primary current of 1600 A for short intervals, which helps absorb transient load spikes without immediate derating. The inverter uses a recommended conductor cross-section of 95 mm² and has a frame weight of 40 kg, so the cabinet layout must account for both cable capacity and mounting support.