PSI63C0.729-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.729-W1 is a medium frequency inverter from the PSI Frequency Inverters series and weighs approximately 25 kilograms. It operates with a mains voltage range of 400 to 480 VAC and a nominal system current of 110 Amps. This water-cooled inverter provides a maximum output current of 2 Amps at 24 VDC from its integrated power supply unit and supports up to 256 programs.
Internal Product Review
The PSI63C0.729-W1 is a medium frequency inverter with a water-cooled design that fits demanding industrial power applications very well. Operation across 400 to 480 VAC mains and a 110 A nominal system current gives the unit a strong, stable electrical foundation. IP20 protection and an integrated 24 VDC power supply make the inverter a well-engineered choice for dependable cabinet installations.
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Product Description:
The PSI63C0.729-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts three-phase utility power into a regulated medium-frequency output suited for induction heating, hardening, or similar industrial processes that demand precise energy dosing. The unit is water-cooled, so it can be installed in tightly packed cabinets without adding a significant air-handling load, and its MOV-based overvoltage protection safeguards downstream resonant circuits. A 3.6 V AA backup battery maintains parameter memory, while the integrated Ethernet timer coordinates firing sequences with external controllers.
The inverter accepts a supply of 400 to 480 VAC at either 50 or 60 Hz and can deliver a nominal system current of 110 A to the secondary circuit. Internally, a clock frequency of 1 kHz drives the switching modules and sets the granularity of power modulation. Liquid cooling is mandatory; the heat exchanger requires a flow rate of 4 L/min with inlet water no warmer than 30 °C, and the design accounts for 420 W of cooling losses under full load. Installation wiring can be up to 35 mm², and the frame carries a protection rating of IP20, so it must be mounted inside an enclosure that meets the 3K3 climatic category under EN 60721-3-3. The operating temperature ranges from +10 °C to +55 °C, while storage and transportation are permitted between -25 °C and +70 °C.
An integrated power supply provides 24 VDC at up to 2 A for sensors, contactors, or fan motors, eliminating the need for a separate DIN-rail supply. The internal controller can store up to 256 user programs, allowing each workpiece family to run with individualized ramp and soak profiles. During fault conditions, the power stage can withstand a secondary current surge as high as 36 kA, which helps prevent premature shutdown when melting loads fluctuate. Despite these electrical capabilities, the assembly weighs only 25 kg, which simplifies installation in existing machine frames.
