Product Description:

The PSI63C0.752-L1 is a medium-frequency inverter from Bosch Rexroth Indramat in the PSI Frequency Inverters series. It is designed for automated welding lines and similar processes, where it converts three-phase mains power into a controllable medium-frequency output for welding transformers and weld timers. By combining power electronics, networked I/O, and fast regulation in one unit, it serves as the central power stage between PLC commands and the welding transformer. That arrangement helps the welding system respond quickly to changing load conditions during repeated production cycles. It is suited to applications where precise current shaping is needed to keep weld quality consistent from cycle to cycle.

The inverter accepts a mains range of 400 - 480 VAC, allowing connection to common plant supplies without tap changes. Under nominal conditions, it draws 110 A, while the power section can process surges up to 800 A during short welding pulses. The digital regulator closes its control loop every 1 ms and works with a sequence frequency of 1000 Hz so the secondary current follows programmed profiles accurately. This timing behavior supports repeatable weld energy delivery during short production cycles. Air cooling removes switching heat, and a TriCore processor handles pulse-width modulation and diagnostics while PROFINET I/O exchanges setpoints and feedback with the line controller.

Cabinet heat dissipation is listed as 69 W during basic operation and increases to 170 W at maximum current. Power terminals accept conductors down to 35 mm², while clamp blocks accommodate 50 mm² feeder wiring to match the inverter's current capacity. A pair of 144-channel serial maps supports discrete inputs and outputs, and an Ethernet timer synchronizes weld schedules stored in a library of 1024 programs. The I/O structure allows the inverter to exchange status and command data with surrounding machine controls without separate interface hardware. The unit has a mass of 20 kg, which suits slide-out drawer mounting in industrial cabinets.