Product Description:

The PSI63C0.710-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat and supplied within the PSI Frequency Inverters series. As a drive component, the unit converts fixed mains power into a controlled intermediate frequency that energizes resistance welding transformers and other inductive loads used in automated production lines. By adjusting the waveform, the inverter enables precise heat input and cycle timing, which is essential for consistent joint quality in high-throughput stations.

The inverter uses a water-cooled circuit that directs coolant through an internal plate to remove switching losses and protect semiconductors during sustained duty. The housing is rated IP20, so the unit must be mounted inside an enclosure free from conductive dust. Its mechanical dimensions are 448 mm in height, 239 mm in width, and 280 mm in depth, allowing installation in standard control cabinets. For power input, the unit accepts three-phase mains from 400 - 480 VAC and draws a nominal line current of 110 A, while welding strokes may require up to 800 A in the primary circuit. Bus bars to the supply must have at least a 35 mm² cross-section, and squeeze timing in the process can be set as low as 16 ms to match fast electrode closure sequences.

In the secondary path, the inverter can deliver up to 36 kA (PSG 3100), making it suitable for multi-spot guns that use 32 electrodes. Cooling performance is maintained with a maximum pressure of 10 bar and a minimum flow rate of 4 l/min to help prevent thermal drift. Control logic is handled on the E/A_DISKR2ED I/O board, and the unit accommodates 256 programmable sequences for repeatable welding routines. A built-in EtherNet timer synchronizes discharge windows at 1000 Hz, while the stop circuit can quench the contactor through a 24 VDC, 3 A path.