Product Description:

The PSI63C0.779-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It is intended for automated installations that require tightly regulated high-current power, where standard three-phase utility input must be converted into a controlled medium-frequency output for induction heating, welding, or similar processes. By combining power conversion, control electronics, and water-cooled thermal management in one housing, the unit serves as the drive stage between a plant’s low-voltage supply and the secondary circuit used by the process.

The inverter accepts a three-phase input of 400 – 480 VAC and draws a nominal mains current of 110 A. Inside the unit, a 32-bit TriCore processor executes modulation routines, while the dual Ethernet interface provides one port for standard I/O and a dedicated timer channel for real-time coordination with PLCs. Peak demand is supported by a primary current limit of 800 A and a secondary pulse capacity of 36 kA, which allows the inverter to energize low-impedance loads without overload at startup. A galvanically isolated 24 VDC auxiliary supply delivers 2 A to external sensors, and the power wiring requires a minimum conductor cross-section of 35 mm² with a 50 mm² terminal limit. The transistor stack is water cooled, and the internal cooling passages keep pressure drop low enough for use with standard plant chillers.

During continuous operation, the inverter dissipates 69 W of basic losses, and that value rises to 110 W inside the cabinet when the unit delivers maximum line current. The cooling circuit is sized for 4 l/min of water flow and can remove up to 360 W of heat, which helps keep semiconductor temperatures within the intended operating range. The housing weighs 25 kg, so it can be panel mounted without added structural support in many installations. Its low hydraulic resistance also allows it to be connected to existing chiller loops without requiring unusually high coolant pressure.