PSI65C0.725-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI65C0.725-W1 is a medium frequency inverter from the PSI Frequency Inverters series, featuring a water-cooled design and IP20 protection. It operates with mains voltages between 400 and 480 VAC at either 50 or 60 Hz, and has an integrated power supply unit with a maximum output current of 2 A at 24 VDC. The unit weighs approximately 25 kg and can operate in temperatures from 10 to 55 degrees Celsius.
Internal Product Review
The PSI65C0.725-W1 is a Bosch Rexroth Indramat medium frequency inverter with water-cooled thermal management. Operation on 400 to 480 VAC at 50 or 60 Hz supports straightforward integration into standard industrial power systems. An integrated 24 VDC power supply rated at 2 A adds practical control-side support and makes this inverter a strong fit for demanding machine platforms.
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Product Description:
The PSI65C0.725-W1 belongs to the PSI Frequency Inverters series manufactured by Bosch Rexroth Indramat. Classified as a medium-frequency inverter, it supplies controlled current to resistance-welding or similar processes that require programmable energy delivery to multiple electrodes on automated production lines. An integrated 24 VDC power supply supports local control electronics, while the overall design focuses on compact cabinet installation and closed-loop water cooling to keep semiconductor temperatures within safe limits during continuous duty.
The input section accepts three-phase mains from 400–480 VAC at either 50 Hz or 60 Hz, and the output stage can deliver up to 2400 A of primary current for short, high-energy welding pulses. Output frequency is adjustable up to 1 kHz, allowing efficient transformer sizing and fast process control. A separate auxiliary supply furnishes 24 VDC at 2 A for sensors or contactors, removing the need for an external supply module. Thermal management is based on a water-cooled heat sink. A coolant flow rate of at least 10 liters per minute must be maintained, resulting in a pressure drop of 0.65 bar while dissipating 420 W of inverter losses and 100 W from the switch-cabinet base.
The enclosure carries a protection rating of IP20, making it suitable for clean, closed panels that meet the series’ 3K3 climatic category requirements. Control logic can store 256 user programs and address up to 32 welding electrodes through the built-in Ethernet timer interface. Reliable operation is permitted at ambient temperatures from +10 to +55 °C and installation altitudes up to 2,000 meters, while storage temperatures may range from -25 to +70 °C. Each power cable may use a conductor with a cross-sectional area of 120 mm². The unit weighs 25 kg, which facilitates handling during installation or removal inside existing automation cabinets.
