Product Description:

The PSI63C0.779-L2 is a medium-frequency inverter produced by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. It converts fixed high-voltage three-phase mains power into a regulated medium-frequency output that drives induction heaters, resonant power supplies, and other automation loads requiring adjustable kilohertz ranges. In a typical installation, it mounts inside a control cabinet and communicates with Ethernet-based timers to synchronize startup, dwell, and shutdown sequences with upstream controllers.

The power section accepts three-phase input at 480 to 690 VAC and works with utility line frequencies of 50 or 60 Hz, allowing deployment in both European and North American grids. A built-in auxiliary supply delivers a fixed control voltage of 24 VDC and can provide a maximum current of 2 A for relays, sensors, or network switches, eliminating the need for an external 24 V module. Thermal dissipation from semiconductors and magnetic components is rated at 360 W; this heat must be removed by cabinet airflow to prevent derating. The enclosure has a protection rating of IP20, making the device finger-safe but unsuitable for areas exposed to conductive dust or washdown sprays. Control timing is handled through an Ethernet timer channel, so process sequences can be adjusted remotely without proprietary fieldbus hardware.

The air-cooled design channels ambient air across internal heat sinks, so clear duct paths and particulate filters are required for reliable operation. Rated operation is maintained between +10 and +55 °C, while nonoperating storage is permitted from −25 to +70 °C in accordance with climatic category 3K3 under EN 60721-3-3. The inverter has an approximate mass of 21 kg, which must be considered when selecting cabinet supports and mounting hardware. Adequate clearance around the ventilation paths helps prevent recirculation of heated exhaust air. The cabinet layout must also protect the open ventilation system from excessive dust and moisture.