Product Description:

The PSI63C0.333-W1 belongs to the PSI Frequency Inverters series produced by Bosch Rexroth Indramat. It is a medium-frequency inverter that converts three-phase mains power into controlled output for automated machinery, while its built-in control electronics manage timing and protection functions used in industrial automation. In resistance welding systems, it works with the connected transformer and control network to deliver repeatable energy during each weld cycle. This makes it suitable for production equipment that depends on synchronized switching and stable process timing.

The inverter accepts a supply of 400 – 480 VAC and draws a nominal mains current of 110 A, so the incoming feeder must be sized for that load. Internal power losses amount to 69 W, which is the heat load that cabinet ventilation must remove during operation. A protection rating of IP 20 limits installation to clean, dry enclosures, so the unit is intended for cabinet mounting rather than exposed placement on the machine. Water cooling keeps the power stage within limits, and the circuit requires a minimum flow of 4 l/min through an M16 × 1.5 thread while the water temperature remains below 30 °C. The cooling loop typically sees a pressure drop of 0.1 bar at that flow rate. Control electronics are supplied by an integrated 24 VDC, 2 A power supply, so no external source is needed for that function. Cable lug landings accept conductors from 35 mm² to 50 mm² to match thermal and ampacity requirements.

On the output side, the unit can deliver up to 800 A of primary current, which corresponds to 36 kA on the secondary of a PSG 3100 welding transformer. That output level supports high-current transformer service in welding applications where short, repeatable energy pulses are required. Hydraulic tongs or welding guns can be sequenced with up to 32 electrodes because the built-in INTERBUS timer synchronizes firing cycles at the inverter's 1 kHz operating frequency. The cooling circuit may see a maximum water pressure of 10 bar, and flow must not drop below the stated minimum to prevent overheating. Primary wiring, transformer matching, and cooling hose selection must remain within these electrical and hydraulic limits.