Product Description:

The Bosch Rexroth Indramat PSI63C0.766-L1 is a cabinet-mounted power module from the PSI Frequency Inverters series. In body-in-white welding stations, it converts three-phase mains power into controlled medium-frequency outputs that drive servo-controlled welding transformers and electrodes. By delivering precisely timed current pulses, it coordinates squeeze, weld, and hold phases, helping automated cells maintain consistent nugget quality while minimizing heat input to surrounding sheet metal.

The inverter accepts a mains supply of 400 – 480 VAC and draws up to 110 A under nominal production load. For high-current weld bursts, the DC link can deliver a primary current ceiling of 800 A, which the downstream PSG 3100 transformer converts to a secondary peak of 36 kA at the welding caps. Internal switching occurs at a sequence frequency of 1000 Hz, giving short thermal cycles that limit electrode wear. Base thermal dissipation is 69 W, so most cabinets can evacuate heat with standard airflow when idle, and air-cooled construction further simplifies installation. A TriCore processor supervises timing, while the E/A_DISKR2ED I/O module propagates discrete control signals to clamps and cylinders. Ethernet/IP connectivity is available onboard, providing real-time feedback to higher-level PLCs.

When the unit commands all 32 welding electrodes simultaneously, heat dissipation increases to 170 W, so enclosure airflow must be verified. The built-in timer can start a weld sequence after only 16 ms of squeeze, matching short-cycle body-in-white requirements. Power wiring should use at least 35 mm² conductors, while the spring terminals accommodate up to 50 mm² to support the demanded current density. An Ethernet-based timer architecture coordinates multiple inverters over the line network, and the onboard interface keeps cycle synchronization within microseconds.