Product Description:

The PSI63C0.660-W1 is a medium-frequency inverter with an integrated weld timer produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It converts three-phase mains power into regulated medium-frequency output for resistance-welding transformers and other high-current processes used in automated production cells. The integrated controller synchronizes weld current and timing for precise heat input while the inverter accepts logic signals from higher-level automation controls.

The inverter draws a nominal mains current of 110 A during normal welding sequences, and its input stage can tolerate a peak of 800 A during the first half-cycle of each ignition pulse. The internal electronics use 24 V DC, and that supply can source up to 2 A for control circuits connected through the STKK 14-pole logic connector with 3.5 mm spacing. Battery-buffered RAM retains operating data for the integrated controller. The unit is intended for cabinet mounting, meets the IP20 degree of protection, and uses metal-oxide varistor surge arresters with integrated temperature monitoring in climatic category 3K3. Communication to external PLCs uses an RS-232 port with 8E1 framing, and the water-cooled power stage limits cabinet heat dissipation to 69 W.

The RS-232 interface transmits parameter sets at a fixed rate of 19200 bit/sec, allowing a supervisory controller to upload or select any of the 256 stored welding programs without interrupting production. During extended duty cycles, the water jacket must remove up to 420 W of inverter cooling losses, and this requires coolant flow above 4 l/min. Additional heat from contactors and auxiliary electronics raises switch-cabinet dissipation to a maximum of 110 W, and installation altitude is limited to 2000 m. A MOV network on the primary input works with integrated temperature sensors so the medium-frequency power unit can disconnect before semiconductor limits are exceeded.