Product Description:

The PSI63C0.774-L1 is a medium-frequency inverter produced by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. In forming presses or induction furnaces, the device converts three-phase utility power into a regulated medium-frequency output, giving precise control of heat profiles and process speed in automated lines. This type of power conversion supports repeatable heating behavior during changing load conditions. Integration into PLC architectures is straightforward because its I/O fieldbus is Ethernet, and the unit is intended for mounting inside a control cabinet.

It accepts a mains supply of 400 – 480 VAC across three input phases and switches its power modules at a control clock of 1 kHz. During continuous duty, the inverter supplies a thermal current of 110 A, while peak demands are covered by a maximum output current of 800 A. Current is metered in 10-amp steps, providing fine resolution over the heating curve. This helps the control system follow stored heating routines without abrupt changes in output. Cabinet dissipation is limited to 69 W, so the standard air-cooled design removes heat without auxiliary chillers. The electronics carry a protection rating of IP20, which guards conductors from accidental contact and requires installation in a protected enclosure. All timing operations share a millisecond time base, enabling deterministic switching between stored process sequences.

Thermal limits include a maximum cabinet air temperature of 45 °C and an internal junction temperature of 55 °C; when either threshold is approached, the control logic can interrupt power with a secondary current cutoff rated at 36 kA. Sequencing is managed by a timer module that draws 24 V DC and can address up to 256 user programs. Program selection is handled through the network used for process feedback, which centralizes timing and operating control inside the drive. This arrangement reduces the need for separate external timing hardware.