Operation
4812160101_A.pdf 2014-07-04
Advice when using DCO
DCO functions so that the amplitude is reduced or
increased in relation to the rigidity of the underlying
surface. When moving from a soft to a solid surface,
the amplitude is reduced and vice versa.
The DCO sensor depth measurement is always larger
than the actual compaction depth, and this affects the
performance of the control system. The rigidity of the
underlying layer affects the control system, even if the
compacted layer is very rigid. The control system is
limited, or does not operate.
In almost all cases it is recommended to select
automatic with the amplitude selector in position 10.
The control system automatically selects the optimal
amplitude in relation to the rigidity of the compacted
layer. The control system does not come into
operation until a specific rigidity has been achieved. If
this rigidity is never reached in the compacted layer,
the control system does not activate. The best
compaction performance is most often achieved with
maximum amplitude.
There are some exceptions when it is an advantage to
reduce the maximum amplitude with the amplitude
selector:
• When compacting a thin layer of coarse grade earth, or
gravel, the depth of the surface loosening is reduced by
selecting to limit the maximum amplitude.
• When compacting a layer of coarse grade earth, or gravel,
over a layer of vibration-sensitive earth such as silt, silty
clay or clay with a high water ratio. Excessive vibrations
can damage the underlying layer.
When extra runs are made for compaction control and
documentation with the documentation system DCA it
is recommended to set the amplitude selector in
position 2 to 4, depending on the size of the machine
and expected rigidity of the surface.
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