PSI6301.001-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI6301.001-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It is water cooled, has a mains voltage range of 400 to 480 VAC, and supports a maximum primary current of 800 A. The unit has an IP20 protection rating and weighs approximately 25 kilograms.
Internal Product Review
The PSI6301.001-W1 is a Bosch Rexroth Indramat medium frequency inverter built for demanding welding applications, featuring water-cooled operation and IP20 protection. Performance is especially strong with a 400 to 480 VAC mains voltage range and a maximum secondary current of 36 kA, supporting stable high-current processing. This unit stands out as a capable and efficient inverter platform for high-throughput installations.
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Product Description:
The PSI6301.001-W1 medium-frequency inverter is manufactured by Bosch Rexroth Indramat within the PSI Frequency Inverters series. Intended for resistance welding and induction heating, it supplies controlled medium-frequency power while coordinating up to 256 stored programs and as many as 32 electrode pairs in automated cells. The unit includes a cabinet water-cooling interface and weighs approximately 25 kg, making it suitable for machine frames where space and thermal loads are tightly managed.
The inverter connects to a three-phase input of 400 to 480 VAC at a mains frequency of 50 or 60 Hz. Under nominal conditions, it draws a full-load current of 110 A, so upstream cabling requires a minimum cross-sectional area of 35 mm² and terminals rated for conductors up to 50 mm². An integrated control supply provides 24 VDC at up to 2 A for contactors and sensors. On the process side, the converter delivers a primary current of 800 A, which the matching transformer converts to 36 kA for the secondary welding circuit. Heat generation inside the cabinet is 69 W during standby and rises to 110 W when the inverter is fully loaded. The power electronics transfer 360 W of heat to the water circuit during normal operation and up to 420 W during short bursts.
The water-cooling circuit requires a minimum flow of 4 L/min to keep semiconductor junction temperatures within their permitted limits. The heat exchanger produces a pressure drop of only 0.1 bar at the required flow rate. The cooling circuit supports pressures up to 10 bar and an inlet water temperature of up to 30 °C. The enclosure has a protection rating of IP20, which protects against contact with internal components but does not provide protection against water. Continuous operation is permitted from +10 to +55 °C under climatic class 3K3. During storage or transportation, the inverter can withstand temperatures from -25 °C to 70 °C.
