Product Description:

The PSI63C0.357-W2 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It converts plant-level power into controlled welding energy for resistance-welding cells and embeds timing and pressure coordination so that electrodes close, pressurize, and release in step with the line PLC. By integrating fieldbus and local I/O, the unit occupies the role of both power stage and sequence controller, delivering repeatable heat input while forwarding process data to higher-level automation systems.

A TriCore microcontroller executes calculation and gating tasks. All onboard logic and sensor circuits draw from a dedicated 24 VDC supply, isolating them from the high-power section. Command signals arrive through 8 digital inputs and leave through an equal number of digital outputs, each referenced to the control supply. The power section accepts a three-phase mains window of 480–690 VAC, which it rectifies and inverts into the medium-frequency range used by welding transformers. Its internal control loop refreshes every 1 ms, allowing the inverter to shape current envelopes and adjust pressure ramps that contain up to 10 distinct profile steps. Three separate programmable weld times support pre-heat, welding, and forging phases, while an INTERBUS-S interface and an INTERBUS timer coordinate external sequence triggers. An 8-pin Mini-DIN RS-232 connector is provided for service access.

Thermal stability is maintained by a water-cooled heat sink, enabling continuous duty even when the cabinet environment is warm. Up to 256 weld programs can be stored, each addressing different materials or sheet thicknesses, and the controller can supervise 31 managed electrodes to balance wear across a multi-gun station. A USB Type B port offers quick parameter backup and local access from a laptop without interrupting fieldbus traffic.