Product Description:

The PSI63C0.779-W2 is a medium-frequency inverter from Bosch Rexroth Indramat that belongs to the PSI Frequency Inverters series. It converts three-phase mains power into controlled welding current for robotic or stationary resistance welding equipment, allowing fast energy delivery and precise heat input on the shop floor. The drive exchanges status bits and setpoints over an Ethernet/IP fieldbus, and stop-circuit diagnostics are handled through a 24 V logic rail.

The inverter accepts a line supply of 480 – 690 VAC and draws a nominal current of 110 A. These input ratings set the cabinet fusing and cable sizing upstream of the unit. A sequence rate of 1000 Hz lets the timer generate finely resolved weld pulses, and the PSQ6000 XQR controller module orchestrates those pulses through internal EtherNet timing. Basic cabinet losses are limited to 100 W, while water channels remove up to 420 W of heat so neighboring components are not heat-soaked. Minimum preweld time is 16 ms, allowing real-time adaptation to sheet stack thickness. Tooling logistics are supported by a dressing-tool capacity of 2 and an electrode magazine that holds 32 tips. Power leads are terminated on lugs up to 50 mm², with a minimum permissible cross-section of 35 mm² to keep conductor temperature within design limits.

During production peaks, the inverter can deliver a primary current of 800 A, stepping through an internal transformer to a secondary crest value of 36 kA. This short-burst capability is critical for high-conductivity materials that need rapid nugget formation. Continuous operation is protected by a water-cooled jacket that must receive at least 4 L/min to prevent thermal runaway. The stop circuit can absorb actuator energy at 24 VDC / 3 A, ensuring safe dissipation when a weld sequence is aborted. An EtherNet timer synchronizes current, pressure, and motion events so each weld remains consistent across multi-gun lines.