Product Description:

The PSI6300.224-L1 is a medium-frequency inverter produced by Bosch Rexroth Indramat in the PSI Frequency Inverters series. Designed for induction hardening, melting, or high-cycle welding power sources, the unit converts standard plant power into controlled medium-frequency outputs for automated machinery. It acts as the central energy module in closed-loop heating cells and press systems, governing coil current and resonant circuit voltage with millisecond precision.

The inverter accepts a three-phase mains input of 400–480 VAC, a range that matches common factory distribution networks, and it can deliver up to 800 A to the work coil through its IGBT bridge and output transformer. Internal logic, gate drivers, and fieldbus electronics are powered by a separate 24 V DC control supply. Power devices switch at 1 kHz, providing a 1 ms time base that aligns with the integrated PROFIBUS timer for process sequencing. All components are enclosed in an IP20 housing, so the device must be installed inside a ventilated cabinet. The air-cooling path can handle inlet air temperatures up to 45 °C, while the ambient temperature around the panel must not exceed 55 °C. Program capacity reaches 256 steps, allowing detailed thermal profiles to be configured for controlled processes.

Basic cabinet power loss is 69 W during nominal operation, but heat generation rises to 170 W at maximum power. The installation must also accommodate a 360 W cooling loss when the blower runs at full speed. Continuous duty is supported by a nominal system current of 110 A, while secondary current pulses of up to 36 kA can pass without exceeding the magnetic limits of the output transformer. Screw terminals accept conductors up to 50 mm² to minimize voltage drop, and forced airflow keeps the silicon components and busbars within their operating limits when the inlet temperature remains below 45 °C.