Product Description:

The PSI65C0.778-W1 is a medium-frequency inverter built by Bosch Rexroth Indramat for the PSI Frequency Inverters series. The unit converts industrial three-phase mains power into a controlled medium-frequency output that feeds induction coils, transformers, or other loads requiring precise energy delivery. Designed for integration into automated production lines, the inverter combines power conversion, logic processing, and a built-in auxiliary supply so machine controllers can trigger heating, melting, or surface-treatment steps with repeatable electrical performance. Its compact enclosure permits straightforward mounting in multi-axis control cabinets.

The inverter accepts a mains voltage range of 400–480 VAC and draws a rated mains current of 330 A when delivering full output. The DC link is switched at a primary carrier frequency of 1 kHz, keeping switching losses moderate while controlling current ripple. The unit can store up to 256 parameter sets, and cycle coordination is handled through the EtherNet timer interface. The enclosure has an IP20 protection rating, so the device must be installed inside a control cabinet that protects it from dust and moisture. An integrated auxiliary supply provides 2 A for the gate drivers. The logic stage draws an inrush current of 2 A for 10 ms before settling to a continuous current draw of 1.5 A.

Thermal management relies on a water-cooled heat exchanger. The cooling loop must supply at least 10 L/min of water and produces a pressure drop of 0.65 bar. It must also be able to absorb up to 4400 W of dissipated heat. The shared control bus is rated at 24 VDC, allowing the integrated power section and logic circuitry to draw from a single low-voltage source. On the power side, the converter handles 2400 A on the primary circuit and supports parallel operating currents of up to 360 kA on the DC bus. It can deliver 120 kA on the secondary winding, and these current levels affect conductor sizing and fault-protection requirements.