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PSI6100.148-L1 Bosch Rexroth Indramat

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The Bosch Rexroth Indramat PSI6100.148-L1 is a medium frequency inverter from the PSI Frequency Inverters series. It operates with a mains voltage of 400 to 480 VAC and a nominal current of 110 Amps, and supports a maximum welding current of 20 kA. The inverter uses air cooling and features an IP20 protection rating, with a maximum electrode count of 32.

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Product Description:

The PSI6100.148-L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It conditions three-phase mains power and feeds welding transformers so that spot-welding processes receive stable current pulses during automated assembly. By modulating duty cycles at several hundred hertz, the unit provides precise heat input, making it suitable for body-in-white lines, appliance frames, and other resistance-welding workstations. This control over pulse delivery supports consistent weld formation when sheet thickness, electrode force, and cycle timing must remain closely coordinated.

This inverter accepts a line supply of 400 – 480 VAC at 50/60 Hz, drawing a nominal mains current of 110 A under rated load. Internal IGBT gating is kept within temperature limits by an air-cooled design that relies on cabinet airflow rather than liquid circuits. Downstream busbars must be no smaller than 35 mm² because the primary side can deliver 400 A to the welding transformer, while the secondary output reaches a peak of 20 kA to fuse sheets consistently. An integrated 24 VDC rail provides logic power; it is stabilized at 24 VDC and can source up to 2 A for valves, sensors, or the discrete 24 V I/O ports. A 24 V timer interface coordinates squeeze, weld, and hold intervals without external relays, which simplifies wiring between the inverter and the welding sequence controls.

The control section is built around a Standard CPU, allowing deterministic sequence execution for up to 32 welding electrodes addressed by the inverter. Process variants are stored as 256 individual programs in battery-buffered RAM, so recipes remain available after power loss. An overall height of 463 mm facilitates stacking with other inverters of comparable frame depth, and the terminals are sheltered to the IP20 protection level required inside an electrical cabinet. Battery buffering helps preserve stored welding schedules during temporary outages, reducing the need to reload process data before production resumes.

Cooling Method
Air Cooled
Cpu Type
Standard CPU
I/o Interface
Discrete 24 V
Integrated 24 V Current
2 A
Integrated 24 V Output
24 VDC
Mains Frequency
50/60 Hz
Mains Nominal Current
110 A
Mains Voltage
400 - 480 VAC
Max Electrode Count
32
Max Primary Current
400 A
Max Welding Current
20 kA
Min Conductor Size
35 mm²
Overall Height
463 mm
Product Type
Medium Frequency Inverter
Program Count
256
Program Memory
Battery-Buffered RAM
Protection Rating
IP20
Timer Type
24 V

Frequently Asked Questions about PSI6100.148-L1:

Q: What is the maximum welding current output for the PSI6100.148-L1 inverter?

A: The PSI6100.148-L1 supports a maximum welding current of 20 kA.

Q: What mains voltage is required for the PSI6100.148-L1 frequency inverter?

A: This inverter operates on a mains voltage of 400 to 480 VAC.

Q: How many individual programs can be stored on the PSI6100.148-L1?

A: The PSI6100.148-L1 has a program count capacity of 256.

Q: What cooling method does the PSI6100.148-L1 use?

A: An air-cooled system is used for temperature regulation on this model.

Q: What type of I/O interface is provided on the PSI6100.148-L1 inverter?

A: The I/O interface for this inverter is discrete 24 V.


Internal Product Review

  • ‘‘The PSI6100.148-L1 is a medium frequency inverter designed for stable resistance welding service, with a 400 to 480 VAC mains voltage range and 110 A nominal mains current. Air-cooled construction and IP20 protection support dependable cabinet integration in controlled industrial environments. A 20 kA maximum welding current and 256 program capacity make the inverter a very capable choice for high-throughput welding cells.’’

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