PSI63C0.737-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.737-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It has a continuous current rating of 110 Amps and can achieve a maximum output current of 800 Amps while operating with a mains voltage of 400 to 480 VAC. The inverter features a water cooled design with a cooling flow of 4 liters per minute and an IP20 degree of protection.
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Product Description:
Bosch Rexroth Indramat manufactures the PSI63C0.737-W1 medium-frequency inverter as part of the PSI Frequency Inverters series. The unit converts three-phase mains energy into a regulated medium-frequency output for induction heating, melting, and other high-power industrial processes that demand precise energy dosing at frequencies higher than line power. Within an automation cell, it bridges the power stage between the supply transformer and the work coil, while its digital controls synchronize with fieldbus motion sequences.
The inverter accepts a three-phase input of 400 – 480 VAC and delivers regulated output while conducting up to 110 A continuously. For brief thermal transients, it can supply 800 A to the load. Internal logic and gate drivers are fed from a 24 V DC control rail, and all switching devices are timed by a 1 kHz clock so ripple stays within work-coil tolerances. The enclosure carries an IP20 rating, making cabinet installation mandatory while still allowing convenient service access. Base dissipation is 69 W, and at full load the cooling circuit must remove up to 420 W plus an additional 110 W from power-cabinet losses. Mains synchronization and cycle supervision are handled through the integrated EtherNet timer interface, which links the inverter with PLC sequencing.
The inverter uses a water-cooled heat sink. A flow of 4 l/min at an inlet temperature no higher than 30 °C keeps semiconductor junctions below their design limit even when secondary current peaks reach 36 kA. Reliable operation is maintained in electrical rooms up to 55 °C, so the same frame can serve harsh foundry or forging lines when the specified coolant is available. Because the cooling loop removes most waste heat, the inverter’s internal fans only balance residual cabinet base losses, which helps keep acoustic noise low.
