Product Description:

The PSI6300.108-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It converts three-phase power to a controllable medium frequency for induction heating, welding, and other industrial processes that require rapid energy transfer. Water cooling is integrated into the design, so the unit can be mounted inside a switch cabinet without relying on ambient airflow.

The power stage accepts a mains voltage of 400–480 VAC and draws a nominal mains current of 110 A during steady operation. For fast thermal cycles, its rectifier can tolerate a primary current surge of up to 800 A, while the output transformer can deliver a secondary current of 36 kA to the connected load. Cooling losses inside the heat exchanger reach 420 W, so sufficient coolant capacity must be available to keep the semiconductor junctions below their temperature limit. Control wiring is handled through discrete 24 V I/O connections. The timer circuit and external signaling share this low-voltage domain, simplifying interlocking. Power terminations require a minimum conductor cross-section of 35 mm², and the screw terminals accept cable lugs rated for conductors up to 50 mm².

A minimum water flow of 4 L/min is required. At this flow rate, the pressure drop across the internal channels is only 0.1 bar, allowing the inverter to be connected to closed-loop chillers with modest pump capacity. The assembly weighs 25 kg, which eases cabinet installation while providing sufficient mass for mechanical stability. Overall dimensions are 448 mm in height, 280 mm in depth, and 239 mm in width, allowing the enclosure door to close without additional spacers. Auxiliary electronics dissipate 69 W of heat, and this value must be included in cabinet climate calculations to prevent controller derating.