Product Description:

The PSI63C0.788-L1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It converts three-phase mains power into controlled medium-frequency power for induction heating, welding, and other processes that require adjustable energy delivery. Inside an automation cell, the inverter sits between the plant supply and the connected load, regulating voltage and frequency while synchronizing production cycles through its Ethernet-based timer function.

This model draws power from industrial networks rated at 400 to 480 VAC and supports line frequencies of 50 or 60 Hz, so it can be connected directly to common European or North American power systems. The housing has an IP20 protection rating, which makes the terminals finger-safe, but the unit must still be installed in a dry enclosure. Its climatic category is 3K3 per EN 60721-3-3, indicating the permitted humidity and vibration conditions for cabinet installation. Heat is removed through an air-cooled channel that discharges into the control panel, so the enclosure must provide sufficient ventilation. An integrated auxiliary supply provides 24 VDC at up to 2 A, allowing contactors, sensors, and fieldbus nodes to operate without a separate power supply. Cycle initiation is handled through the built-in Ethernet timer, which provides deterministic start and stop commands over standard plant networks.

The switching stage generates up to 360 W of cooling losses, which must be considered when calculating the required cabinet airflow or heat exchanger capacity. Continuous operation is supported at ambient temperatures from +10 to +55 °C, while powered-down units may be stored or transported at temperatures from -25 to +70 °C without damage. The inverter weighs 20 kg, so the selected backplate and mounting hardware must support its mass securely. Its moderate weight also adds thermal inertia, which helps limit rapid internal temperature changes during load transients. Adequate spacing around the cooling channel prevents heated exhaust air from circulating back through the inverter and supports consistent operation within the permitted ambient range.