PSI63C0.760-L1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.760-L1 is a medium frequency inverter from the PSI Frequency Inverters series. It uses a TriCore CPU and provides a nominal current of 110 Amps with a main voltage range of 400 to 480 VAC. The inverter has a maximum primary current of 800 Amps, supports Ethernet-IP on-board, and is air cooled, weighing 20 kilograms.
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Product Description:
The PSI63C0.760-L1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It is installed between a plant’s power distribution and welding transformers to shape current pulses for resistance-welding cells and other high-duty cyclic loads found in automated production lines. By converting three-phase mains power into regulated medium-frequency output, the unit allows precise heat input and shorter cycle times, improving process repeatability across multi-station installations. This operating role helps maintain stable weld energy during rapid, repetitive production sequences.
The inverter accepts a line supply of 400 – 480 VAC and delivers a continuous phase current of 110 A. For brief surge events, the primary side can reach 800 A, while the secondary circuit connected to the electrodes can peak at 36 kA. Heat produced by switching and conduction is dissipated through an air-cooled heat sink, and the design caps internal thermal loss at 360 W. Cable lugs from 35 mm² up to 50 mm² can be landed on the terminals, and a stop-circuit relay rated 24 VDC / 3 A is provided for contactor interlock. An onboard EtherNet/IP module supports diagnostic polling and network control, while the TriCore CPU manages timer functions through Ethernet commands.
The power stage feeds up to 32 welding electrodes in a programmed sequence and operates at 1000 Hz. Material conditioning is controlled by a preheat interval as short as 16 ms, after which energy is held until a programmable start timeout of 60 s expires. This timing structure helps prevent unintended activation after long idle periods. Minimum cable sizing rules and the 20 kg enclosure mass allow floor-mounted or robot-arm installation while maintaining electrical clearances and conductor ampacity during dynamic motion.
