Product Description:

The PSI63C0.181-L1 is produced by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. Classified as a medium-frequency inverter, it supplies regulated current to induction heating coils, resistance welding transformers, or similar loads that must be driven above conventional line frequency. In automated cells, it functions as a programmable power source, bridging the utility feed and the workpiece while allowing the PLC to select from stored process programs.

The power stage accepts a three-phase input of 400–480 VAC and draws a nominal mains current of 110 A under rated conditions. For short welding pulses, primary current can rise to 800 A while the output switching network sustains a medium frequency of 1 kHz, giving tight energy dosing per cycle. Control electronics are based on a TriCore CPU that synchronizes firing patterns and manages discrete 24 V I/O lines routed through IP20-rated terminals; the IP20 degree of protection is intended for mounting inside a closed electrical cabinet. Air-cooled construction directs cabinet airflow across heat sinks, and the design requires a conductor cross-section of at least 35 mm² to keep bus losses within limits. Integrated temperature monitoring issues a fault before thermal limits are reached, and a 24 V timer circuit coordinates step-sequence timing with external controllers.

When the inverter is idling, cabinet basic losses equal 69 W; at maximum inverter duty they rise to 170 W, and if enclosure ventilation is included, the total cooling requirement can reach 360 W. Up to 32 electrodes may be driven simultaneously, and each can be assigned to one of the stored process programs. The program count stored in nonvolatile memory is 256. The unit weighs 20 kg, is specified for a minimum 35 mm² supply connection, and relies entirely on forced cabinet air for heat removal.