System Perturbation - Bosch PSU 5000 Series Instructions For Assembly And Operation Manual

PSU 5000 / PSG 3000
Safety instructions
Instructions for Assembly and Operation

System perturbation

When operating a welding inverter a harmonic load must be accounted for in the
mains system. This load is caused by the "B6" rectifier circuit with a smoothing
capacitor.
The following figure shows the typical curve of the mains voltage (top) and the re-
lated mains current (bottom) in one phase during the welding process:
Typical 300 Hz
The 5th, 7th, 11th, 13th, 15th, and 17th harmonic wave are the characteristic har-
monics of the mains current curve.
The harmonic component depends on the welding power.
NOTE
We recommend operating the welding inverter on a separate welding mains sys-
tem. The harmonic content may be considerably reduced, e.g., by using smoothing
reactors with 4% short-- circuit voltage.
There are no requirements as to harmonic loads in industrial applications.
So far, no impact on other devices (PC's etc.) has been determined.
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