Product Description:

The PSI63C0.740-L1 medium-frequency inverter is built by Bosch Rexroth Indramat and belongs to the PSI Frequency Inverters series. Designed for automated welding and other controlled-power applications, the unit converts three-phase mains energy into a stable medium-frequency output so induction coils or transformer-based weld guns receive consistent current. Inside an automation cell, this inverter operates as the power stage while higher-level controllers manage motion, sequencing, and safety logic.

The inverter accepts a three-phase supply between 400 – 480 VAC, and its input section is cooled by forced air that carries heat away from the power semiconductors. A TriCore processor executes regulation loops and coordinates firing pulses while maintaining deterministic communication over the integrated Ethernet/IP interface. Mechanical placement is simplified by the required clearance of 100 mm on every side, ensuring unobstructed airflow through the chassis. For job storage, the control board holds 256 selectable programs, allowing qualified weld profiles to be recalled without external memory. Each program is synchronized to the 1 ms time base so current, voltage, and displacement curves repeat identically from cycle to cycle.

Digital expansion is provided by 32 serial inputs that accept sensors, interlocks, or robot handshake lines, while an equal number of outputs drive clamps, solenoids, or alarm indicators. The stop circuit interrupts the gate drive with up to 3 A at 24 VDC, enabling fast shutdown that aligns with category-rated safety relays. Field wiring enters screw terminals rated for conductors up to 50 mm², so high-current leads can be landed without additional busbars. During production, the inverter modulates output at 1000 Hz, and three independent weld-time segments allow adjustment of pre-heat, main, and forge intervals to match material thickness, electrode geometry, and nugget strength requirements.