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Operation
Setting limit
The compaction meter value view in display will give
the operator all information needed during compaction;
engine rpm, gear position, speed, frequency and
inclinations are in display together with actual CMV
and the limit set in brackets. Use the buttons
underneath the display to set the limit. The scale will
switch automatically depending on the CMV reading.
If double-jump occurs the operator will first get a
warning (!).
Secondly the ABC will shut off vibrations and give a
message to the operator to continue compaction with
a lower vibration amplitude setting or if variable
frequency is available reduce the vibration frequency.
The sensor is fitted on the mounting plate of the main
bearing and it senses the vibrating motion of the drum.
The information is transmitted to the processor unit
where it is analyzed.
The analyzed information is presented in the display
as a digital value expressed as CMV, Evib1 or Evib2.
High or low measuring range is automatically selected
and viewed in the display. The resulting numerical
value is a relative measure of the ground stiffness
achieved.
Operation CMV
The Compaction Meter measures the dynamic
stiffness of the ground and presents a value based on
this. The CMV, Evib1 or Evib2 is influenced by the
rolling speed, rolling direction (forward or reverse),
amplitude setting and vibration frequency. The
Dynapac Compaction Meter (DCM) is less sensitive to
small variation in vibration frequency.
The water content in the compacted soil (not relevant
for rock fill) has a large influence on stiffness, wet soil
will result in low values and dry soil will result in higher
values.
When double-jump occurs, the value CMV will be
reduced, these lower values should not be used to
determine if compaction is ready or not.
4812159001_I.pdf
2019-11-05
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