PSI62C0.761-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI62C0.761-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It has a water cooled design, supports a mains voltage of 400 to 480 VAC, and features a maximum primary current of 1200 Amps. The inverter offers IP20 protection, a rated mains current of 220 Amps, and Ethernet-IP network connectivity.
Internal Product Review
The PSI62C0.761-W1 is a Bosch Rexroth Indramat medium frequency inverter with water-cooled thermal management and an onboard EtherNet/IP interface. A 400 to 480 VAC mains range paired with 220 A rated mains current supports stable integration in high-demand welding systems. IP20 protection and 1000 Hz sequence frequency make this unit a strong choice for controlled, repeatable production performance.
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Product Description:
Bosch Rexroth Indramat manufactures the PSI62C0.761-W1 in its PSI Frequency Inverters series. Classified as a medium-frequency inverter, the unit is installed between the mains supply and a welding transformer so that automated resistance welding stations can meter energy with millisecond timing. Within its housing, it accepts factory power, drives the transformer through water-cooled power electronics, and supports onboard EtherNet/IP networking so the cell controller can issue weld sequences and monitor real-time current feedback.
The inverter draws three-phase power in the range of 400 – 480 VAC and, under continuous duty, carries a rated mains current of 220 A through mains conductors with a 95 mm² cross-section. For heavy projection or spot welds, it allows a primary current crest of 1200 A; this is converted to a secondary pulse that can reach 54 kA at the electrodes. Water cooling extracts heat from the IGBT stack, helping keep semiconductor junction temperatures stable during rapid switching, and the lithium AA 3.6 V backup battery preserves parameter sets if mains power is lost. The unit has IP20 protection, so it must be mounted inside a filtered panel.
The control board runs from a low-voltage logic rail, so the drive needs only an external supply at 24 VDC for its microprocessors and relay coils. Users may store up to 256 individual welding programs, and each program can call a stepper routine; a maximum of 32 routines are available. The system clocks weld, squeeze, and hold actions with a sequence frequency of 1000 Hz, while the minimum programmable pre-weld or squeeze interval is 16 ms. Up to thirty-two electrodes can be addressed, a V24/RS232 nine-pin port is provided for local setup, and water-cooled hardware keeps the internal temperature within safe limits throughout high-demand cycles.
