PSI62C0.781-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI62C0.781-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It features a water cooled system with a cooling water flow of 4 liters per minute and operates at a mains voltage of 400 to 480 VAC. The inverter has a maximum output current of 1200 A and offers IP20 degree of protection.
Internal Product Review
The PSI62C0.781-W1 is a medium frequency inverter with water-cooled thermal management. Operation on 400 - 480 VAC with 1200 A maximum output current gives the inverter strong headroom for demanding process loads. IP20 protection supports dependable cabinet integration, while the 55 °C ambient rating stands out in continuous-duty service.
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Product Description:
The PSI62C0.781-W1 belongs to the PSI Frequency Inverters series manufactured by Bosch Rexroth Indramat. As a medium-frequency inverter, it converts three-phase utility power into a controlled output for induction heating, welding, or other processes that need fast energy delivery at precise current levels. Its water-cooled construction supports installation in high-duty production lines where cabinet temperatures approach the specified ceiling, and an MOV network provides coordinated overvoltage suppression on the DC link.
The inverter accepts a mains input of 400 – 480 VAC and can deliver a maximum output current of 1200 A to the work coil. Internally, the control section operates at a 1 kHz clock frequency, allowing fine resolution of pulse patterns that shape the medium-frequency waveform. Heat generated by the power semiconductors is removed by water flowing at 4 l/min, and the assembly carries a IP 20 degree of protection that requires mounting inside a closed panel but permits safe touch under de-energized conditions. An EtherNet timer coordinates program execution, and as many as 256 individual programs can be stored for quick changeovers between parts or recipes.
The power stage is rated for a maximum secondary current of 54 kA, giving headroom for short-term surges above the nominal 220 A system current without saturating the transformer. Cooling water must enter below 30 °C to hold semiconductor junction temperatures within limits when the ambient reaches the permitted 55 °C maximum. A maintenance-free buffer cell supplies 3.6 V to preserve program data during mains interruptions, and field wiring up to 95 mm² can be landed on the line terminals through an M16 × 1.5 threaded water connection block. Together these capabilities form a compact inverter platform that supports high current density, precise thermal management, and flexible process sequencing.
