6 Structure and function
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100_0101_sf_0001.fm
Inverter
The inverter comprises a current rectifier and a d.c.-a.c. converter monitored by
an electronic control.
The current rectifier converts the input voltage (AC single phase) to DC voltage.
The d.c.-a.c. converter converts the generated DC voltage to three phase current
(AC three phase).
When the machine is switched on, the control electronics provides a soft start
and thus prevents critical starting currents.
Vibrator head
In the vibrator head, an electric motor drives an eccentric weight at approx.
12,000rpm (200Hz) and thus generates precessions. By these precessions the
vibrator head introduces vibrations into the concrete.
