Product Description:

The PSI63C0.761-W2 is a medium-frequency inverter produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. In automated welding cells, it receives three-phase power, shapes the output waveform, and synchronizes weld timing so robotic guns can deliver consistent heat to every joint. That function places the device at the center of resistance-welding control loops, linking high-voltage mains, water-cooled transformers, and Ethernet-based production monitors.

The inverter removes heat through a water-cooled plate, allowing continuous operation even when duty cycles are high and enclosure airflow is limited. A wide input span of 480 – 690 VAC lets the same frame connect to European or North American high-voltage feeds without tap changes. Control electronics draw a steady 1.5 A, while the 24 VDC supply draws 2.0 A for 10 ms at startup to charge internal capacitors and prevent nuisance trips on tightly fused control buses. Internal timers increment at 1 ms, so squeeze, weld, and hold segments can be set with timing precision suited to automotive production requirements. Secondary weld monitoring is also supported, with the logic accepting measured impulses per weld sequence to verify current flow.

The resolution of weld current is 10 A, enabling fine adjustment of energy without overshooting delicate sheet-metal limits. Up to 256 parameter sets are stored locally, and the controller can step through 3 separate weld times per program to accommodate preheat or postheat profiles. An IP-rated cabinet is not mandatory because the housing itself has an IP20 rating, and field wiring remains behind finger-proof barriers. Programming is carried out through a 9-pin D-Sub linked to a V24/RS232 interface, while Ethernet handles timer functions for real-time line coordination.