PSI6100.333-L1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI6100.333-L1 is a Medium Frequency Inverter from the PSI Frequency Inverters series. It operates on 400 to 480 VAC mains voltage with a frequency of 50 or 60 Hz and is air cooled, featuring an integrated power supply with 24 VDC output at a maximum of 2 A. The degree of protection is IP20, and it weighs approximately 20 kg.
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Product Description:
The PSI6100.333-L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat and delivered under the PSI Frequency Inverters series. It regulates welding current and mechanical force in automated resistance-welding cells, synchronizing power delivery with squeezing sequences so the electrodes receive the commanded energy profile at the correct moment in the cycle. The unit connects to three-phase mains between 400–480 VAC and operates with either a 50 Hz or 60 Hz line supply. This input range supports installation on common industrial power networks used by automated welding equipment.
Internally, the inverter generates a switching pattern at 1000 Hz, providing tight current control for thin materials and coated sheets. A maximum welding current of 20 kA is available, while forced-air cooling dissipates up to 360 W of losses through the chassis. The integrated power rail delivers 24 VDC at up to 2 A for connected sensors. The housing is rated at IP20, so the unit must be mounted inside a suitable enclosure. Eight discrete inputs and eight discrete outputs exchange status information with PLC logic, while additional commands travel over the PS5 IBS OPC fieldbus through the INTERBUS timer module. The inverter stores 256 welding programs and applies 8-bit force setpoints with feedback scaling of 1 kN/V. It also references nine connected electrodes to track usage for each electrode.
The unit has a total mass of 20 kg, which must be considered when selecting its mounting surface and hardware. The electronics remain functional at ambient temperatures from +10 to +55 °C and can be stored or transported between -25 °C and +70 °C without degradation. During a welding cycle, the force controller adjusts pressure in 50 N increments and can apply a maximum force of 12.75 kN to the workpiece. The shortest selectable squeeze time is 16 ms, supporting rapid sequencing on high-throughput spot-welding lines. Before current begins to flow, the system can perform three distinct pressure checks to verify that the workpieces are properly clamped. Its air-cooling arrangement complies with the requirements of the 3K3 climatic category.
