Product Description:

The PSI63C0.766-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat in the PSI Frequency Inverters series. It converts three-phase mains power for induction heating, brazing, and other medium-frequency tasks in automated lines. The unit is installed in IP20 control cabinets and uses water cooling to keep semiconductor temperature within acceptable limits. It delivers timed energy bursts that help maintain consistent process output during repeated heating cycles.

Inside, a switching bridge drives the DC link at 1 kHz, giving fine power resolution for temperature-sensitive workpieces. Logic circuits run from a 24 V DC control supply that remains active during line dips and keeps the gate drivers initialized. The inverter accepts 400 – 480 VAC three-phase input and can source 800 A to the work coil. The matching transformer can reflect peaks of 36 kA on the secondary, covering a broad range of coil impedances. MOV devices protect both the power section and the control bus from overvoltage, the nominal system current is 110 A in continuous duty, and ramp-up and ramp-down events are coordinated through an EtherNet timer module that exchanges status with the plant PLC. Cabinet power lugs accept 50 mm² conductors, and operation is permitted up to 2000 m altitude without current derating.

Thermal control is based on measured loss figures: idle cabinet dissipation is 69 W, and switching at full power raises it to 110 W. Including bus losses, total cooling demand can climb to 420 W. To remove this heat, 4 l/min of water circulates through M16×1.5 ports, and inlet temperature must remain below 30 °C. The design tolerates ambient air up to 55 °C without derating when coolant flow is maintained. Water cooling helps prevent localized heating along the IGBT module baseplates during continuous operation.