Product Description:

The PSI6300.153-L1 is a medium-frequency inverter built by Bosch Rexroth Indramat for the PSI Frequency Inverters series. Installed between the mains supply and a welding transformer, the unit converts three-phase utility power into a regulated medium-frequency output used in resistance welding cells and other automated production equipment. This conversion allows precise current control and shorter thermal cycles while fitting inside a switch cabinet that secures the housing with M6 bolts and maintains the 100 mm installation clearance required for safe airflow.

Electrically, the inverter accepts a three-phase input of 400–480 VAC and draws a nominal line current of 110 A at rated duty. Inside the power stage, a primary circuit can surge to 800 A, and when combined with a PSG 3100 transformer, the secondary path can supply up to 36 kA for short welding pulses. The IGBT bridge switches at a welding frequency of 1000 Hz; the higher switching rate improves heat balance in the workpiece and reduces transformer mass. The drive logic is handled by a standard CPU, while discrete 24 V I/O and a 24 V timer input coordinate trigger commands with upstream controllers. Terminal clamps support conductors up to 50 mm², and installation is completed with shielded leads anchored to the cabinet’s grounding plate.

Thermal management relies on an air-cooled design that dissipates up to 360 W of inverter heat through controlled cabinet airflow. When the output stage is fully loaded, the enclosure adds 69 W of basic losses and 170 W of additional heat associated with current modulation. The steel housing stands 463 mm high and extends 231.5 mm deep, dimensions that affect panel spacing and duct routing. Power entry requires a minimum conductor cross-section of 35 mm², ensuring an acceptable temperature rise under the stated load.