Product Description:

The PSI65C0.737-W1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It serves as a power converter that delivers regulated medium-frequency energy to induction heaters, tempering stations, or motor-generator sets in automated cells. By placing the inverter between the plant mains and the load, output current and frequency can be adjusted electronically instead of through mechanical tap changers. The unit connects to PLCs over an industrial network and forms the power stage of closed-loop temperature or motion control systems.

The inverter is designed for use in 400 VAC switchgear. It accepts a three-phase input of 400–480 VAC, and heat is removed through a water-cooled exchanger attached to the power stack. The bridge can be modulated up to 1000 Hz, providing fine control for medium-frequency processes. Systems communicate through EtherNet/IP, while machine-level logic uses 26 inputs and 19 outputs for interlocks, status signals, and warning lights. The mains and transformer connections each use 2 × 120 mm² conductors. A 60-second contactor timeout prevents immediate reenergization after a fault. The Ethernet timer core manages sequencing, while a 5-second pressure-feedback timeout stops operation if coolant flow drops. A 1-second transformer-feedback delay synchronizes voltage sampling with the next operating cycle.

In parallel mode, the platform allows three inverters to operate together, and the shared DC link carries a peak current of up to 360 kA. The stop loop is rated at 24 VDC / 3 A and disables all gate drivers without opening the main breaker. Coolant pressure is regulated through an 8-bit pressure output, providing a digital control signal for the cooling system. Supervisory commands travel through a 48-input / 48-output serial channel that relays diagnostic data and process recipes. Parallel operation coordinates power delivery among the connected units, while the stop loop provides a direct method for disabling inverter output. The timing functions monitor contactor operation, coolant pressure, and transformer feedback during each operating sequence.