Product Description:

The PSI64C0.720-W1 inverter is produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. Classified as a medium-frequency inverter, it supplies controlled high-frequency current for induction heating or similar automation tasks. The device converts three-phase utility power into a regulated output, while its TriCore CPU handles internal modulation, protection, and diagnostic routines. An integrated Ethernet port links the inverter to PLCs or industrial PCs for parameter downloads and process feedback. The design relies on a water circuit to remove heat generated by the switching stage.

The inverter uses a water-cooled thermal system, and the cooling circuit must absorb up to 700 W of internal losses at the rated flow. Electrical input is accepted from grids operating between 400–480 VAC. The housing measures 653 mm high, 288 mm wide, and 280 mm deep, allowing placement in standard machine frames. During heavy load cycles, the commutation section can draw a maximum primary current of 1600 A, while a minimum water flow of 4 L/min keeps semiconductor temperatures within safe limits. The water pressure drop is 0.6 bar at this flow, allowing typical plant chillers to circulate the coolant. The enclosure provides top and bottom cable landings, and the system accepts shielded motor leads routed through IP-rated glands.

Circuit protection on the enclosure door is matched to a nominal output of 220 A, and downstream bus bars must withstand peak secondary currents reaching 54 kA during fast transients. The electronics are housed in an IP20 cabinet, so the inverter must be installed in a clean control room or enclosed rack. A threaded M16 × 1.5 connector provides a secure hose attachment to the cooler. The required cable cross-section of 95 mm² minimizes voltage drop at full load. Timing functions are implemented through an Ethernet-based timer block, ensuring synchronization with external controllers without additional field wiring.