Product Description:

The PSI65C0.788-W1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts constant mains power into controlled medium-frequency outputs required for induction heating stations, welding transformers, and similar automated cells. The unit is intended for cabinet mounting and is equipped with a closed-loop water-cooling system so that high current conversion can proceed without allowing excess heat to accumulate in surrounding electronics. Digital processing and the closed-loop cooling system support continuous production duty.

The inverter is supplied from a three-phase grid rated at 400 – 480 VAC, while internal controls operate on a separate 24 VDC logic supply. A TriCore CPU executes commutation, protection, and diagnostic routines, exchanging data with the plant PLC over an Ethernet I/O interface, while time-critical sequences are coordinated through an EtherNet-based timer. Because the power stage is water-cooled, a minimum flow of 10 L/min is required, and the inlet temperature must remain below 30 °C to keep semiconductor junctions within limits. Under these thermal conditions, the converter can process 2400 A of primary current and generate up to 120 kA on the secondary circuit. The cooling loop can operate at pressures up to 10 bar without affecting the brazed plate exchanger.

Thermal losses that do reach the control cabinet are quantified: base operation dissipates 100 W, whereas full-power runs elevate cabinet loss to 850 W. The external cooling circuit extracts a further 4400 W from the unit. At the specified flow rate, the hydraulic path introduces only 0.65 bar of pressure drop, limiting pump workload. The inverter weighs 70 kg. Program memory accepts 256 instruction blocks, allowing several operating sequences to be stored at one time.