PSI61C0.788-L1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI61C0.788-L1 is a medium frequency inverter from the PSI Frequency Inverters series with a nominal current of 110 Amps and a maximum output current of 400 Amps. It operates on a mains voltage of 400 to 480 VAC and offers IP20 protection, using air cooling to manage up to 360 Watts in maximum cooling losses. The 20 kg inverter supports a control supply of 24 V DC and includes MOV overvoltage protection.
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Product Description:
The PSI61C0.788-L1 medium-frequency inverter is produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts three-phase utility power into a regulated medium-frequency output that drives induction heating coils or specialized motor loads in automated equipment. By modulating energy at carrier-level frequencies, the unit supplies controllable current to secondary circuits, while its internal 24 V logic section manages gating, diagnostics, and network timing within a protected cabinet-mounted enclosure.
The inverter accepts a line supply of 400–480 VAC at 50 or 60 Hz and operates from a 24 V DC control supply. An auxiliary 24 V DC, 2 A source is available for sensors or relays. Pulse generation operates at a clock frequency of 1 kHz. Continuous operation supports a nominal load of 110 A, while cabinet power losses measure 69 W under basic conditions and rise to 170 W at full load. The switching section is housed in a cabinet with an IP20 protection rating. Power terminal blocks accept conductors up to 50 mm², and the control wiring terminals accept conductors up to 35 mm². Timer functions and status data are transferred through an Ethernet interface, allowing the inverter to exchange operating information with the connected control system.
Air cooling removes up to 360 W of switching heat when the cooling air temperature remains below 45 °C. The unit operates at ambient temperatures from +10 °C to +55 °C and can be stored between -25 °C and +70 °C. A clearance of 100 mm around the chassis maintains the airflow needed for cooling, while climatic category 3K3 under EN 60721-3-3 indicates suitability for control-room installations. Surge events are clamped by a MOV network, and the inverter also includes overvoltage protection. Output current peaks can reach 400 A, while downstream fault currents can momentarily approach 20 kA. The inverter weighs 20 kg, which supports secure cabinet installation without placing excessive load on the mounting structure. Terminal insulation distances are arranged for the electrical requirements associated with medium-frequency operation.
