Bosch 6000 Technické informace stáhnout pdf (Strana 19)

Safety instructions

1-12

1070 080 059-101 (2001.04) GB

1.8 System perturbation

When operating a medium-frequency inverter a harmonic load must be ac-

counted for in the mains system. This load is caused by the ”B6” rectifier cir-

cuit with a smoothing capacitor.

The following figure shows the typical curve of the mains voltage (top) and

the related 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

harmonics of the mains current curve.

The harmonic component depends on the welding power.

. Note: The harmonic content may be considerably reduced, e.g., by us-

ing smoothing reactors with 4% short-circuit voltage.

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Bosch 6000 Technické informace Strana 19