Product Description:

The PSI6300.176-W2 is a medium-frequency inverter produced by Bosch Rexroth Indramat for use in the PSI Frequency Inverters series. Intended for induction heating, brazing, and related automation tasks, the unit converts high-voltage three-phase power into a controllable medium-frequency output that allows accurate delivery of thermal energy on production lines. It interfaces with Bosch Rexroth PSG medium-frequency transformers to energize induction coils during the forming or surface hardening of metal parts.

During operation, the inverter draws a nominal line current of 110 A from industrial power supplies rated at 480–690 VAC. During short heating cycles, the primary bus can rise to 800 A, while the associated PSG 3100 transformer secondary reaches 36 kA for high peak coil currents. Heat generated by the power semiconductors is removed through a water-cooled baseplate that must receive at least 4 l/min of coolant. At that flow rate, the pressure drop is 0.1 bar, allowing operation on existing plant cooling loops without a booster pump. The circuit may be supplied at pressures up to 10 bar, and the inlet temperature is limited to 30 °C to maintain safe semiconductor junction temperatures.

Total cooling losses of 420 W are transferred to the water circuit, while control cabinet dissipation remains limited to 140 W, so only modest forced airflow is required inside the enclosure. The housing stands 448 mm high, spans 239 mm in width, and extends 280 mm in depth, with 100 mm of required vertical clearance to provide airflow around auxiliary components. Power leads must have a minimum cross-sectional area of 35 mm², and the assembly weighs 25 kg, allowing installation without heavy lifting equipment. Control sequencing is handled by an internal 24 V timer, and the coolant ports use an M16 × 1.5 thread for straightforward hose connections.