PSI63C0.781-L2 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.781-L2 is a medium frequency inverter from the PSI Frequency Inverters series, weighing approximately 21 kg. It operates with a mains voltage of 480 to 690 VAC at a frequency of 50 or 60 Hz, and features an air cooled design with an IP20 degree of protection. The integrated power supply unit delivers a maximum output current of 2 A at 24 VDC.
Internal Product Review
The PSI63C0.781-L2 is a Bosch Rexroth Indramat medium frequency inverter designed for stable drive control on 480 - 690 VAC mains. Air cooling and IP20 protection support dependable cabinet integration in controlled industrial settings. An integrated 24 VDC power supply rated at 2 A adds useful system support and makes this inverter a well-rounded choice.
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Product Description:
The PSI63C0.781-L2 is a medium-frequency inverter produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. As a dedicated drive component, it converts high-voltage three-phase line power into a regulated medium-frequency output used to energize induction heating coils, shrink-fit stations, or other process loads that benefit from precise energy delivery at kilohertz frequencies. Within an automation cell, it provides the controlled power stage, while its integrated 24 V logic supply supports contactors, sensors, and fieldbus nodes without requiring an external auxiliary unit.
The housing has an IP20 protection rating, so it must be mounted inside a switchgear cabinet while remaining accessible for service. Line terminals accept an input of 480–690 VAC at a nominal current of 110 A, and a built-in rectifier filters either 50 Hz or 60 Hz line power. A secondary supply inside the inverter delivers 24 VDC at up to 2 A for peripheral loads, eliminating the need for a separate DIN-rail power supply. Forced air moves through the cooling channel, and the unit releases 360 W of heat at full load for the cabinet ventilation system to extract. Power wiring requires a minimum conductor size of 35 mm². Installation is permitted under the 3K3 climate class established by EN 60721-3-3, which supports operation on standard production floors with moderate humidity and dust.
Dynamic demands are handled by a primary bus with a surge rating of 800 A, while the associated PSG3100 transformer can supply a fault-limited secondary current of 36 kA without compromising protective coordination. Inverter modulation operates at a medium-frequency carrier of 1 kHz, enabling compact work coils and precise thermal profiles on the heated workpiece. Operation is permitted from +10 °C to +55 °C and at altitudes up to 2,000 m, while storage at temperatures as low as -25 °C is allowed. Control timing is managed through an Ethernet-based timer interface. The assembly weighs 21 kg, which simplifies handling during cabinet installation.
