Kjellberg Finsterwalde KSI 1000 inverter power source in yellow and black with swivel and fixed castors

Contact person
Submerged-Arc Welding

Mr. Sascha RUDNIK

phone +49 3531 500-881
phone_iphone +49 151 5221 2722
email

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KSI 1000

The KSI 1000 inverter power source combines modern technology with over 90 years of experience in submerged arc welding (SAW) at Kjellberg Finsterwalde. Delivering up to 1,000 A of welding current at a 100% duty cycle, it provides reliable continuous operation – even when welding long seams.

For applications requiring higher welding currents, two KSI 1000 units can be connected in parallel using Plug & Play. This provides welding currents of up to 2,000 A.

With an efficiency of 90% and reduced switching losses, the KSI 1000 operates efficiently and exceeds the requirements of the EU Ecodesign Directive. Its robust construction makes it suitable for demanding industrial environments. Swivel and fixed castors make it easier to move the unit, while intuitive controls simplify day-to-day operation.

Combined with the proven SA welding tractors of the KA series, the KSI 1000 offers flexible application options – from automated submerged arc welding to semi-mechanised welding operations. It can also be used as a power source for robotic submerged arc welding. This allows different welding tasks to be carried out using system components configured to work together.

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Power source KSI 1000
Supply voltage 3/PE AC 50/60 Hz, 400 V ± 10%
Connected load at 100% duty cycle 51.5 kVA
Mains fuse (time-delay)1 125 A (80 A or 100 A also possible)
Welding current range 80–1,000 A / 18–44 V DC
  at 100% duty cycle (40 °C) 1,000 A / 44 V DC
Efficiency2 90%
Open-circuit voltage 83 V DC
Degree of protection IP21S
Dimensions
(L × W × H)3		 1,078 × 684 × 1,281 mm
Mass4 208 kg

1 As the maximum mains current is 74 A, 80 A or 100 A fuses or circuit breakers may also be used.
2 At 1,000 A / 44 V DC.
3 Including swivel and fixed castors and lifting eyes.
4 Without mains cable.

  • 1,000 A at a 100% duty cycle (40 °C) – reliable continuous operation, even when welding long seams
  • Parallel operation of two KSI 1000 units delivering up to 2,000 A of welding current – easily achieved using Plug & Play
  • 90% efficiency and reduced switching losses for energy-efficient welding operations
  • Standby active power of 44 W
  • Robust construction for use in demanding industrial environments
  • Intuitive controls for simple and safe operation
  • Swivel and fixed castors make it easy to move the unit between locations
  • Floor-standing design with four lifting eyes and swivel and fixed castors
  • Multiple welding cable connections arranged in parallel
  • Two replaceable inverter modules, each rated at 500 A, with a switching frequency of 40 kHz
  • Additional 42 V AC / 10 A auxiliary power output for the KA series submerged arc welding tractors
  • Dust-protected electronics
  • Degree of protection IP21S, insulation class F and forced-air cooling (AF)
  • Optional: bus interface or conventional interface for external control

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