PSI63C0.181-L1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.181-L1 is a medium frequency inverter from the PSI Frequency Inverters series, weighing 20 kg and using an air cooling method. It operates at a mains voltage of 400 to 480 VAC, supports a maximum primary current of 800 A, and offers up to 256 programmable programs. This model features integrated temperature monitoring, has a degree of protection rated at IP20, and uses a TriCore CPU.
Internal Product Review
The PSI63C0.181-L1 is a Bosch Rexroth Indramat medium frequency inverter with air-cooled operation. A TriCore CPU and 256-program capacity give the platform responsive control and impressive process flexibility. A 400 to 480 VAC mains range and 800 A maximum primary current make this inverter an excellent fit for demanding medium-frequency applications.
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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.
