Product Description:

The PSI6300.256-L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. As a power-conversion unit, it delivers adjustable medium-frequency three-phase energy to induction heaters, welding generators, or similar loads in automated production lines. By processing a standard plant mains feed, the inverter lets motion, thermal, or forming processes synchronize with higher-level controllers while keeping the power section isolated inside a cabinet that meets industrial layout requirements.

It operates from a three-phase supply window of 400 – 480 VAC, and its insulation design tolerates phase-to-ground potentials up to 480 VAC to match common North American and European grids. The input stage draws a nominal current of 110 A, routed through frame terminals that accept conductors up to 50 mm², while the minimum permitted cable size is 35 mm². Cooling is handled by an air-cooled path, so a clearance of 100 mm must be left around the cabinet for unrestricted airflow. The steel door seals against a 3 mm gasket, and the enclosure carries an IP20 degree of protection suitable for installation inside electrical rooms. Both the I/O channel and the internal timer communicate on PROFIBUS, enabling parameter access and cycle coordination. Continuous heat dissipation is supervised by integrated temperature sensors that report to the same fieldbus.

Under light loading, the inverter introduces cabinet basic losses of 69 W. When the current reaches its calculated maximum, the internal losses rise to 170 W, and the ventilation system can remove up to 360 W of cooling losses. The primary bus can momentarily reach 800 A, while the matching PSG 3100 secondary circuit is rated to carry fault currents as high as 36 kA without mechanical damage. These electrical figures determine the protective equipment required around the unit and support the use of integrated temperature monitoring instead of relying only on external sensors.