Product Description:

The PSI63C0.741-L1 from Bosch Rexroth Indramat belongs to the PSI Frequency Inverters series and is used as a medium-frequency inverter for industrial welding control. It converts three-phase input power into precisely timed welding current so connected transformers can deliver controlled heat at the electrodes during resistance welding cycles. This role makes the unit suitable for automated body-shop lines and similar production stations where repeatable energy delivery affects weld quality. By synchronizing with a higher-level controller, it supports consistent nugget formation while helping reduce spatter and unnecessary energy loss.

The inverter accepts plant power from 400 - 480 VAC and uses a separate 24 V DC control supply for its logic and contactor circuits. Internal gating runs at 1 kHz, allowing accurate phase control of the thyristor stack during each weld sequence. A current resolution of 10 A allows fine adjustment around the nominal system level of 110 A, while peak demands up to 800 A can be handled without derating. The controller can store and recall as many as 256 welding programs, including process data, schedule selection, and EtherNet timer interface settings. For field wiring, the mains and output lugs accept conductors up to 50 mm², and the separate terminals support wires up to 35 mm².

The inverter uses air cooling, and the external cooler dissipates 360 W during continuous operation to support stable thermal conditions. Its enclosure has an IP 20 rating, so the unit must be installed inside a suitable control cabinet. The device remains within tolerance at ambient temperatures up to 55 °C, and the internal timer addresses events with 1 ms resolution to support the three programmable weld times available in each schedule. When paired with a PSG 3100 transformer, the inverter can deliver secondary currents of up to 36 kA without exceeding programmed limits. Sensor loops monitor temperature and fan operation so airflow remains stable during repeated welding cycles.