Product Description:

The PSI65C0.738-W1 is a medium-frequency inverter from Bosch Rexroth Indramat in the PSI Frequency Inverters series. It is used in automated production cells that rely on tightly controlled power delivery for heating and welding processes. The unit converts three-phase mains power into a controlled high-frequency output for induction heating coils, weld transformers, and similar loads that require precise current shaping.

The housing carries a protection rating of IP20, so the electronics are guarded against accidental finger contact while remaining ventilated for cabinet mounting. A closed-loop, water-cooled heat exchanger removes switching and conduction losses, allowing continuous operation without external fans. The power section accepts a mains window of 400 – 480 VAC, which matches common factory distribution voltages in 50 Hz and 60 Hz regions. A TriCore CPU executes vector-control algorithms, while the Ethernet I/O interface and an Ethernet-based timer synchronize the inverter with PLC sequences. The internal auxiliary supply delivers 24 V DC at up to 2 A, eliminating the need for an external power pack for sensors, relays, or brake solenoids. Surge events on the DC bus are clamped by an MOV network, and the M10 terminal screws provide secure connections for large conductors.

The cooling loop must sustain at least 10 l/min of flow with a pressure drop not exceeding 0.65 bar. Under these conditions, it can extract up to 4.4 kW of inverter cooling losses and compensate the cabinet's basic heat load of 100 W. When driven from a matched PSG 3100 transformer, the unit handles a primary current of 2400 A, translating to secondary peaks up to 120 kA required by resistance-welding heads. Cabinet losses rise to 850 W at maximum modulation, so the water circuit is essential for maintaining semiconductor junction temperatures.