PSI63C0.757-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.757-W1 is a medium frequency inverter in the PSI Frequency Inverters series. It is water cooled, with a cooling water flow of 4 liters per minute and a maximum inlet temperature of 30 degrees Celsius. This inverter operates at a mains voltage range of 400 to 480 VAC, has a max output current of 800 amps, and features IP20 protection.
Internal Product Review
The PSI63C0.757-W1 is a medium frequency inverter engineered with water-cooled thermal management and IP20 protection. Performance is impressive at 400 - 480 VAC mains input and 800 A maximum output current. Operation up to 55 °C ambient makes this unit a strong choice for demanding industrial power applications.
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Product Description:
The PSI63C0.757-W1 is a medium-frequency inverter built by Bosch Rexroth Indramat and supplied within the PSI Frequency Inverters series. As a dedicated power conversion unit, it generates controlled medium-frequency outputs for induction heating, welding, and other industrial processes that demand rapid energy transfer. The device converts three-phase mains power into a regulated high-current secondary circuit, working with external transformers and capacitors to drive precision automation loads. This arrangement allows the inverter to support repeatable energy delivery in process equipment where output stability and fast response are important.
The inverter switches at a clock frequency of 1 kHz, a rate that affects the spectral content of the output and the size of the associated passive components. Internal logic and fans are supplied from a separate 24 V DC control rail, isolating the gate drivers from the main bus. Separating the control supply from the main power path helps keep auxiliary functions active during normal switching operation. When the bus is energized with a line voltage between 400–480 VAC, the power stage can deliver up to 800 A of primary current to the connected transformer. Liquid heat extraction is mandatory, and with a nominal cooling water flow of 4 l/min, the module maintains semiconductor junction temperatures within safe limits during continuous operation. The unit accepts copper cables up to 50 mm², matching the thermal and electrical load imposed by these currents.
Heat generated in the switching stack is divided between the cabinet and an external radiator. Under nominal load, the external cooler must dissipate 420 W, while the enclosure has an IP20 degree of protection that suits installation inside a closed panel. On the secondary side, the commutation path withstands pulses up to 36 kA, making the inverter compatible with heavy-duty induction coils. Stable operation is permitted up to an ambient temperature of 55 °C, and derating is required above this value to protect component life. Water is connected through an M16×1.5 thread, and the unit’s Ethernet timer interface supports synchronization with higher-level control systems. This layout supports panel installation where cooling and electrical isolation must be managed within a compact machine enclosure.
