Fayat Group DYNAPAC CA2800, Instruction Manual

Page: 85 / 170

Operation
4812159001_I.pdf 2019-11-05
Dynapac Compaction Meter (DCM) including
Active Bouncing Control (ABC) - Optional
Fig. Principal components
1. Display with CMV view
2. Sensor/Processor unit
1
2
The Compaction Meter is an accessory used to ensure
the compaction result and enables optimal material
processing. If the Compaction Meter is mounted on
the machine, a separate view in the machine display
indicates the stiffness of the surface as a compaction
meter value (CMV, Evib1 or Evib2).
CMV is the value traditionally used on Dynapac rollers.
It is calculated based on a numerical analysis of the
vibration frequency of the drum and the harmonics the
occur as the dynamic stiffness in the compacted
material increases. CMV is a dimensionless, relative.
Evib1 and Evib 2 are calculates based on the drum
contact force on the ground and the deformation that
occurs in the compacted material. A low contact force
that causes a big deformation results in a low Evib
value. High force and low deformation consequently
results in a high Evib value. Evib1 is calculated on the
downward movement of the drum (loading phase).
Evib2 is calculated on the upward movement of the
drum (Unloading phase). Which one of the two values
that best correlates to the acceptance control method
must be evaluated from site to site. Different materials
and site conditions result in different correlations.
Evib1 and Evid2 both have the unit Mega-Newton per
square meter (MN/m2).
For more details on the compaction meter
functionality, please refer to the technical specification:
Earthworks - Continuous Compaction Control (CCC)
(CEN/TS 17006:2016) published by CEN, European
Committee for Technical Standardization.
The Active Bouncing Control is always integrated in
the Compaction Meter and after a certain warning time
shuts off vibration if the machine is run in double-jump
(bouncing). This is to save both machine and material
as well as the operator from damages when the
machine starts to double-jump.
The Compaction Meter is available for both D and PD
machines but as the ground contact area varies a lot
on PD the readings may not give any sure
conclusions. However, ABC is still active. The ABC is
only possible to disable via the service tool.
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